Annual phlox (Phlox drummondii) Flower, Leaf, Care, Uses

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Plant Encyclopedia > Annual phlox

Annual phlox

Phlox drummondii

Also known as : Tharp's phlox, Johnston's phlox

Annual phlox (Phlox drummondii) is a flowering plant native to the United States. Thomas Drummond the historical naturalist sent the seeds back to Britain after a trip to Texas, and the plant is named after him. Annual phlox is a popular ornamental plant due to its bright pink flowers, which can be other colors from other cultivars.

Hardiness Zones

4 to 9

Care Guide for Annual phlox

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Watering Care

Moisture-loving, keep the soil moist but do not let water accumulate.

Details on Watering Care

Soil Care

Loam, Sand, Chalky, Clay, Sandy loam, Alkaline

Details on Soil Care

Ideal Lighting

Full sun, Partial sun

Details on Sunlight Requirements

Ideal Temperature

4 to 9

Details on Temperature

Planting Time

Spring

Details on Planting Time

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Annual phlox

Water

Every week

Hardiness Zones

4 to 9

Planting Time

Spring

Questions About Annual phlox

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Watering

Pruning

Sunlight

Temperature

Fertilizing

What is the best way to water my Annual phlox?

To water Annual phlox, you can use a garden hose with a spray nozzle, a watering can, or just about any other common watering tool. Generally, Annual phlox is not too picky about how they receive their water, as they can live off of rainwater, tap water, or filtered water. Often, you should try not to water this plant from overhead, as doing so can damage the leaves and flowers and may lead to disease as well. At times, the best method for watering this plant is to set up a drip irrigation system. These systems work well for Annual phlox as they apply water evenly and directly to the soil. For one Annual phlox that grows in a container, you can use a similar watering approach while changing the tools you use. To water a container-grown Annual phlox, use a cup, watering can, or your tap to apply water directly to the soil.

What should I do if I water my Annual phlox too much or too little?

The remedy for underwatering Annual phlox is somewhat obvious. When you notice that your plant lacks moisture, simply begin watering it on a more regular basis. The issue of overwatering can be a much more dire situation, especially if you fail to notice it early. When your Annual phlox is overwatered, it may contract diseases that lead to its decline and death. The best way to prevent this outcome is to choose a proper growing location, one that receives plenty of sunlight to help dry the soil and has good enough drainage to allow excess water to drain rather than pooling and causing waterlogged soils. If you overwater your Annual phlox that lives in a pot, you may need to consider changing it to a new pot. Your previous container may not have contained soil with good drainage or may not have had sufficient drainage holes. As you repot your overwatered Annual phlox, make sure to add loose soils and to use a pot that drains efficiently.

How often should I water my Annual phlox?

Annual phlox needs water regularly throughout the growing season. Beginning in spring, you should plan to water this plant about once per week. As the season presses on and grows warmer, you may need to increase your watering rate to about two to three times per week. Exceeding at this rate can be detrimental to your Annual phlox. With that said, you should also ensure that the soil in which your Annual phlox grows remains relatively moist but not wet, regardless of how often you must water to make that the case. Watering Annual phlox that lives in a pot is a bit different. Generally, you'll need to increase your watering frequency, as the soil in a pot can heat up and dry out a bit faster than ground soil. As such, you should plan to water a container-grown Annual phlox a few times per week in most cases, versus just once per week for an in-ground plant.

How much water does my Annual phlox need?

There are a few different ways you can go about determining how much water to give to your Annual phlox. Some gardeners choose to pick their water volume based on feeling the soil for moisture. That method suggests that you should water until you feel that the first six inches of soil have become moist. Alternatively, you can use a set measurement to determine how much to water your Annual phlox. Typically, you should give your Annual phlox about two gallons of water per week, depending on how hot it is and how quickly the soil becomes dry. However, following strict guidelines like that can lead to overwatering if your plant requires less than two gallons per week for whatever reason. When growing Annual phlox in a container, you will need to use a different method to determine how much water to supply. Typically, you should give enough water to moisten all of the layers of soil that have become dry. To test if that is the case, you can simply stick your finger in the soil to feel for moisture. You can also water the soil until you notice a slight trickle of excess water exiting the drainage holes of your pot.

How can I tell if i'm watering my Annual phlox enough?

It can be somewhat difficult to avoid overwatering your Annual phlox. On the one hand, these plants have relatively deep roots that require you to moisten the soil weekly. On the other hand, Annual phlox are plants that are incredibly susceptible to root rot. Along with root rot, your Annual phlox may also experience browning as a result of overwatering. Underwatering is far less likely for your Annual phlox as these plants can survive for a while in the absence of supplemental watering. However, if you go too long without giving this plant water, it will likely begin to wilt. You may also notice dry leaves.

How should I water my Annual phlox through the seasons?

You can expect your Annual phlox’s water needs to increase as the season moves on. During spring, you should water about once per week. Then, as the summer heat arrives, you will likely need to give a bit more water to your Annual phlox, at times increasing to about three times per week. This is especially true of Annual phlox that grow in containers, as the soil in a container is far more likely to dry out faster than ground soil when the weather is warm. In autumn, while your Annual phlox is still in bloom, it may need a bit less water as the temperature has likely declined, and the sun is no longer as strong as it was in summer.

How should I water my Annual phlox at different growth stages?

Annual phlox will move through several different growth stages throughout the year, some of which may require more water than others. For example, you will probably start your Annual phlox as a seed. While the seed germinates, you should plant to give more water than your Annual phlox will need later in life, watering often enough to maintain consistent soil moisture. After a few weeks, your Annual phlox will grow above the soil and may need slightly less water than at the seedling phase. Then, once this plant is mature, you can begin to use the regular watering frequency of about once per week. As flower development takes place, you may need to give slightly more water to aid the process.

What's the difference between watering Annual phlox indoors and outdoors?

There are several reasons why most Annual phlox grow outdoors rather than indoors. The first is that these plants typically grow to tall. The second reason is that Annual phlox needs more daily sunlight than most indoor growing locations can provide. If you are able to provide a suitable indoor growing location, you may find that you need to give your Annual phlox water a bit more often than you would in an outdoor growing location. Part of the reason for this is that indoor growing locations tend to be a lot drier than outdoor ones due to HVAC units. The other reason for this is that soil in containers can dry out relatively quickly as well compared to soil in the ground.

Is pruning necessary for my Annual phlox?

Annual phlox is a kind of annual plant so it doesn't need much pruning. You only need to cut off and clean the diseased, yellow or dropped leaves and stems during its growing period. This will help your Annual phlox to stay away from pathogens infection.

How do I prune my Annual phlox?

During the growth of the plant, yellowing, drying and spotted leaves are produced, and these spotted and discolored leaves need to be trimmed off. If the whole piece of leave is discolored or infected, you will need to cut it off completely. In other situations, you will only need to cut off the discolored or infected part on certain leaves. Annual phlox above the ground will die and dry up in the winter, and the dead plants need to be cleaned up.

Are there any cautions I should be careful with when pruning my Annual phlox?

Annual phlox leaves are delicate, so take care not to score or bruise them. Unless the leaves are withered or heavily discolored, do not prune the leaves from the lowermost branches unless they’re damaged. They typically grow the largest, so they supply the plant with critical energy to keep it growing right. Please prevent the wounds from water after pruning until they are fully recovered. Remember always sterilize the tools before pruning. When the pruning is finished, please throw all the waste leaves and stems into the trashbins to avoid diseases and bugs.

Are there any tips for pruning my Annual phlox?

Sterilize all the tools before pruning; unclean tools will pass pathogens to the plant through wounds; Prune on sunny days because the new cuts will be infected by pathogens if they're distained by rain or water. Throw all the waste leaves and stems into trashbins, they will easily rot and attract diseases and bugs

When should/shouldn't I prune my Annual phlox?

Expect to prune your Annual phlox every week if it’s growing well or every two weeks if it grows slowly. It is always good to prune it on sunny days because if you prune it on rainy days, the rainwater will distain the cuts and cause the whole plant to be infected.

What should I look for when pruning my Annual phlox in different seasons?

Because Annual phlox is an annual plant, the pruning should take place basically during the seasons that the plant grows rapidly. During the growth of the plant, yellowing, drying and spotted leaves are produced, and these spotted and discolored leaves need to be trimmed off.

How much sunlight should Annual phlox get per day to grow healthily?

You must expose the plants to at least 6 to 8 hours of sunlight daily. They prefer more exposure to the morning light, especially in the summer. The Annual phlox needs full sun and more sunlight that it can get. The more light these species get, the more they can manufacture food, produce beautiful blooms, and survive.

What type of sunlight does Annual phlox need?

The Annual phlox grows best under full sunlight. It's best not to crowd them together so they can get exposure to the sun evenly. The leaves shouldn't be starved with sunlight. If planted in pots, try to expose the herbaceous flowers in windows with direct sun and ensure they receive full sunlight regardless of the months. They don't tend to do well in partial or filtered light as this will not produce strong stems and healthy flowers. It's best if the Annual phlox is always exposed to the sun.

Can sunlight hurt plants? How to protect Annual phlox from sun and heat damage?

When the temperature rises above 90℉(32℃), the Annual phlox can get damaged by extreme temperatures, especially if they are exposed to many hours of sun. It's always ideal for providing some shade from the light in the afternoon in the summer. It's always important to keep in mind that the sunlight in the summer is stronger than the one in the winter. Sunlight exposure is also 50% longer in the summer than in the winter. If the Annual phlox is too stressed with sunlight, you might want to keep them fully hydrated. Water them when the top of the soil is about 2 inches dry, and move the plants indoors if it's too hot outside. This is the case if they are planted in containers. It can be normal for the plant leaves to wilt during the day. Generally, they can recover at night. However, when you notice that the Annual phlox is still drooping, this means that the plant is losing water fast, and you need to water them.

Should I protect Annual phlox from sun exposure?

The Annual phlox does not need any protection from the sun. In fact, they love the sun, and some species are heliotropic. Plant them in south-facing gardens whenever possible so they can be exposed from morning to afternoon. While the sun can benefit them, some may experience a sunburn. You might offer protection from the afternoon and midday sun through a shade of a tree or a wall. Growing the Annual phlox in shady areas is impossible because the larger flowers would require a lot of energy to grow and produce. Always provide the lighting conditions and set them in an area with full sun for best results.

What will happen if Annual phlox gets inadequate sunlight?

When the Annual phlox does not get adequate sunlight, or they are not placed in full sun locations, it's worth noting that the photosynthetic process will slow down. A lack of sunlight will cause the stems to become more leggy since they become thin and long since they tend to seek too much sunlight. They will not bloom and produce seeds in the shade. Inadequate sunlight will also mean that the older leaves can die, the color of the new ones is lighter than the old foliage, and the new growth is smaller than the last ones. The Annual phlox indeed loves the sun so much. However, they can wilt when exposed to excessive heat and ultraviolet light during the extreme summer months, so be careful. You might want to cover them with a net that has a green shade, especially in the summer, to prevent the leaves and the flowers from scorching. When they are indoors, reduce the heat with the help of a fan.

Does Annual phlox need special care about sunlight during its different growth stages?

When the Annual phlox is growing, they need more light than their mature counterparts. The younger ones should receive adequate light, but they might not be prepared for sudden full sunlight, especially if they are grown in a nursery. They can be more sensitive to the summer sun, so the lighting should be gradual and slow.

How much light does Annual phlox need for photosynthesis?

During summer or late spring, the Annual phlox needs 6 to 8 hours of direct light every single day. This is whether they are planted outdoors. If the Annual phlox is planted in pots or you're growing them in the winter, they need direct fluorescent lights that help them grow better. Make sure to place them in an indoor area where they are facing south or east so they can have enough sunlight for photosynthesis.

Are there any cautions or tips for sunlight and Annual phlox?

When transplanting the plants, they should not be exposed to sudden sunlight. Give the Annual phlox to grow and mature before transplanting outside. Some species of herbaceous plants can grow taller and might cast a shade on other young plants. Allow between 80 to 100 days of growing season before planting another batch to ensure that every plant receives more than enough sunlight for at least 6 hours a day. Make sure that the Annual phlox receives the best light possible, especially if it's planted in a nursery. These are sun-loving plants, but too much sunlight with a very hot temperature is also detrimental to their growth. Indoor lights should be replaced with natural sunlight as much as possible since these species crave this every day.

What is the optimal temperature for Annual phlox?

The best temperature for Annual phlox depends on the time of year. There are two primary seasons to discuss for temperature: the growing season, and the dormancy season. During the growing season, once Annual phlox has begun to sprout, the ideal temperature range should be anywhere from 65~80℉(18~27℃). Any colder than 15℉(-10℃), and the plant will suffer; its leaves may brown and wilt, but if this is a short cold snap, then Annual phlox may be able to survive with some help. During the warmer parts of the year, Annual phlox will need to be similarly protected from temperatures that are too high. 95-105℉ (35-40℃) is the top of this plant’s temperature range, and anything above that will compromise the integrity of the foliage and blooms of Annual phlox. Hotter temperatures can cause wilting, drooping, and even sunburn on the leaves, which can be difficult for Annual phlox to recover from. There are quite a few ways to combat this issue that are quick and easy!

Temperature requirements for first year or seedling Annual phlox

If this is the first year of your Annual phlox outside as a new plant, then it may need a little extra tending during the coldest months of the year. Not only can frost more severely damage a first-year Annual phlox, but it can also prevent it from growing back as a healthy plant come spring. This plant needs to be kept at 40℉(5℃) or above when they’re not yet established, which can be done either by bringing your Annual phlox inside for a month or two, or putting up mulch or fabric barriers that protect from frost damage. It’s also a good idea to plant Annual phlox in a shadier spot during the first year or two, as smaller and weaker plants have a more difficult time maintaining their own temperatures in the heat. First-year Annual phlox should receive no more than five hours of direct sunlight per day, particularly if the ambient daytime temperature gets above 80℉(27℃). Shadecloth and frequent watering or misting are the keys to summer heat control.

How can I protect Annual phlox from extreme temperatures?

If cold temperatures (below 15℉(-10℃)) do occur during the growing season, there are a few measures you can take to help protect Annual phlox from frost or cold damage. If you’re growing Annual phlox in a container, then the container can simply be brought inside in bright, indirect light until the temperatures rise up over the lower threshold again. Another option that’s better suited for ground-planted Annual phlox is to use mulch or horticultural fabric to create an insulated barrier around the plant, which will protect the plant from frost and cold wind. For temperatures that are hotter than 80℉(27℃) in the shade during the day, be careful to only expose Annual phlox to six hours or less of sunlight per day, preferably in the morning hours. Putting up shade cloth, or a fine plastic mesh, can help reduce the amount of direct sunlight that hits the plant during the hottest parts of the day. You can also install a misting system that allows for a slow release of cooling mist around the base of the plant during the day to lower ground temperatures.

Dormant season temperature recommendations for Annual phlox

During the cold winter months, Annual phlox needs a certain measure of cold in order to stay in dormancy until it’s time to sprout. Sprouting too early, that is before the danger of the last frost has passed, can be fatal to Annual phlox, especially if it’s already had a head start when the frost hits. Winter temperatures should ideally stay below 32℉(0℃), but if they get up to 40℉(5℃), everything will be just fine. An unexpected warm spell during the cold months, which can happen in more temperate climates like woodland rainforests, can trigger a premature sprout from Annual phlox. In this case, if there’s still imminent danger of frost, you may want to try covering it with clear plastic on stakes so that the cold has less of a chance of damaging the new sprout. This setup can be removed when the danger of frost has passed. Occasionally, Annual phlox will be able to resprout at the correct time without any help, but this method increases the chances of a successful second sprouting.

Why do I need to fertilize my Annual phlox?

Plants need nutrients to survive; most gardeners, regardless of experience, are well aware of this factor. However, without food, Annual phlox will die out soon after the first pollination. Therefore, providing the right type of nutrients in the right amounts is the best way to keep Annual phlox going throughout the blooming season and producing large, beautiful flowers. Fertilizer also helps Annual phlox build a large, healthy root system. This plant needs all the help it can get since its root system is very thin and easily damaged. Fertilizing at planting helps Annual phlox build a solid root structure that not only provides stability to the plant, but also sets the stage for a sensational flowering performance. When timed correctly, fertilization can greatly extend Annual phlox's flowering period.

When is the best time to fertilize my Annual phlox?

Annual phlox puts on tremendous growth early in the growing season, once the danger of the last frost has passed. It’s during this time that Annual phlox should be fertilized; more specifically, during planting. The idea is to apply when the plant is first planted in the ground or in planters; however you choose to plant it. This will be the only dose of fertilizer until later in the year, when blooms are in full force. Once the season is in full swing and Annual phlox has opened most of its blooms at full size, it’s time to start fertilizing again. Around the time when blooms are at peak output, begin fertilizing again once every three to four weeks, as weather permits. Then, after Annual phlox starts to put out fewer new blooms, stop fertilizing; there’s no need to fertilize when the plant can’t produce any more blooms.

When should I avoid fertilizing my Annual phlox?

While regular fertilizing is important for Annual phlox, it absolutely can be applied at the wrong time. Some situations call for holding back the fertilizer once in a while. These are usually climate related, but they also include a variety of controllable factors. Essentially, when something is wrong with the plant, the soil, or the climate, wait it out until things have been smoothed over and the plant has recovered. An example of when not to fertilize is if there are severe or unexpected changes in the weather. If a cold nap suddenly comes in the middle of summer, wait until it’s warm again to start fertilizing. The same stands for if the soil becomes too dry or too packed to absorb anything. At this point, fertilizer will be going straight to the roots, rather than being diffused by soil before it reaches them. As you can imagine, the roots of Annual phlox aren’t very fond of that. When temperatures soar during the hottest parts of the day into the 90-degree fahrenheit range, don’t apply fertilizer. Since fertilizer can be broken down at various speeds depending on temperature, it’s especially important not to allow hot temperatures to break it down too quickly. Pests or diseases should also be treated and cleared up before re-fertilizing.

What type of fertilizer does my Annual phlox need?

Most types of Annual phlox need the same general balance of nutrients from fertilizer. These should come in the form of a fertilizer that’s formulated specifically for high-yield blooming plants. A fertilizer with a higher level of phosphorus is the best option. This type of fertilizer has a higher P number in its NPK number, for example 10-30-10. Several fertilizer brands sell a fertilizer that’s perfect for blooming plants like Annual phlox, which are an easy and fuss-free way to provide the right nutrients. If you do choose to use a pre-mixed fertilizer, follow the directions on the package to prevent Annual phlox from getting too much or too little fertilizer, both of which can cause the plant to grow poorly or even wilt entirely.

How do I fertilize my Annual phlox?

Depending on the type of fertilizer you have, specific fertilizing instructions may vary. However, there are a few general tips for applying most types of fertilizer to Annual phlox. The first fertilizer application, which should be when you first plant Annual phlox, will likely consist of mixing the recommended amount of fertilizer into the soil before planting and watering in the Annual phlox. Subsequent fertilizing may look a little different. For pellet fertilizers, simply mix the pellets into the top inch of soil around the outer edge of the plant, where the roots are. Water them in very well at first, then water regularly after that. Other fertilizers may be mixed into a watering can and applied just like a regular watering. Follow any instructions on fertilizer packaging for consistency, but if you’d rather keep things on a regular schedule, shoot for every three to four weeks.

What happens if I fertilize my Annual phlox too much?

Over-fertilizing is a very easy mistake to make for first-time gardeners, or even for experienced gardeners trying out a new product. Fortunately, Annual phlox makes this issue known very well by displaying several signs of distress. You may notice that its leaves are yellowing quickly, the foliage may wilt, or new blooms may be under-developed. These are all clear signs of too much food. When you fertilize Annual phlox too frequently, you create uninhabitable soil conditions. Soil may become too hot, which is a term used to describe when soil is too saturated with minerals, nutrients, or compost, and ends up burning the roots of anything planted in it. It’s a good idea to flush out the soil well once a month or so, just by watering twice as much as normal with good drainage.

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Key Facts About Annual phlox

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Attributes of Annual phlox

Lifespan

Annual, Biennial, Perennial

Plant Type

Herb

Planting Time

Spring

Bloom Time

Spring, Summer, Fall

Harvest Time

Fall

Plant Height

25 cm

Spread

15 cm to 45 cm

Leaf Color

Green

Flower Size

2.5 cm

Flower Color

White

Pink

Red

Purple

Yellow

Cream

Blue

Lavender

Fruit Color

Brown

Stem Color

Green

Blue

Orange

Cream

Dormancy

Winter dormancy

Leaf type

Deciduous

Ideal Temperature

20 - 35 ℃

Growth Season

Spring, Summer

Pollinators

Butterflies

Benefits to Pollinating Insects

Adult food

Growth Rate

Rapid

Symbolism

Our souls are united.

Usages

Garden Use

Annual phlox is a popular perennial prized for its profusion of fragrant flowers and early blooming period. It is commonly used as a border or spring groundcover and is essential in bee, butterfly, and hummingbird gardens. Plant it with calibrachoa, verbena, and nasturtiums to attract pollinators throughout the spring and summer.

Scientific Classification of Annual phlox

Phylum

Class

Order

Family

Genus

Species

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Common Pests & Diseases About Annual phlox

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Common issues for Annual phlox based on 10 million real cases

flower wilting

Wilting is a disease that primarily affects the stems and leaves of Annual phlox, causing a visible drooping or collapse. Persistency of the disease may lead to severe weakness and eventually the death of the plant.

Caterpillars

Caterpillars are fleshy moth or butterfly larvae that come in an array of colors, patterns, and even hairstyles. They chew on leaves and flower petals, creating large, irregular holes.

Solutions: Even though caterpillars are diverse, they all chew on plant parts and can cause significant damage if present in large numbers. For severe cases: Apply insecticide. For an organic solution, spray plants with a Bacillus thuringiensis (Bt), which specifically affects the larval stage of moths and butterflies. Be sure to coat plants, since caterpillars need to ingest Bt for it to be effective. This will not harm other insects. Spray a chili extract. Chili seeds can be cooked in water to make a spicy spray that caterpillars don't like. Spray this mixture on the plants, but be aware it will also be spicy to humans. Introduce beneficial insects. Release beneficial insects to the garden that eat caterpillars, such as parasitic wasps. For less severe cases: Hand pick. Using gloves, pick off caterpillars on plants and dispose of them in a bucket of soapy water. Dust plants with diatomaceous earth. This powder is harmless to humans but irritates caterpillars. Therefore, it will make it difficult for caterpillars to move and eat.

Aged yellow and dry

Natural aging can cause leaves to turn yellow and dry out.

Solutions: If the yellowing and drying of leaves and flowers is a natural progression due to age, nothing can be done to slow or stop the process. Once hormones within the plant begin the process of senescence, it’s irreversible.

Powdery Mildew

Powdery mildew is a white mold that appears on leaves. It can be wiped away.

Solutions: As powdery Mildew spores are transported by the wind, it can be tricky to put a complete stop to the spread of the fungus. Luckily, there are several easy treatments for plants that are exhibiting symptoms: If powdery Mildew seems to be impacting isolated leaves or stems, they can simply be trimmed away and disposed of. Disinfect pruning tools after doing this. Remove any plant debris from the ground around the infected plants and dispose of it in the garbage. Then, cover the soil with a thick layer of mulch to limit reinfection. Milk sprays have been found to be useful in controlling powdery Mildew. Make up a spray consisting of 60% water and 40% milk and spray on the affected plants. This can also be used as a preventative measure. In cases where powdery Mildew is more widespread, plants can be sprayed with a mild sulfur- or copper-based fungicide or a non-toxic solution made from baking soda and soap. Sprays can help areas that have been recently infected, though they are less effective against well-established infections. If possible, try transplanting the plants to a sunnier location. Though powdery Mildew does fine in hot, dry conditions, it is unable to reproduce without some humidity. Putting plants in more direct sunlight can help stop the spread of the fungus. Trimming around closely-packed plants can help improve airflow, which also prevents the reproduction of the fungus.

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Distribution of Annual phlox

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Habitat of Annual phlox

Roadsides, fields, waste places, grasslands, open woodlands

Northern Hemisphere

South Hemisphere

Distribution Map of Annual phlox

Annual phlox is native to the southeastern region of North America. This species has been introduced to various parts of South America, Southeast Asia, and Eastern Europe. It is widely cultivated beyond its native range, often found in ornamental gardens for its colorful flowers.

Native

Cultivated

Invasive

Potentially invasive

Exotic

No species reported

More Info on Annual Phlox Growth and Care

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Basic Care Guide

Common Pests & Diseases

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Lighting

Full sun

The annual phlox robustly thrives under generous sun exposure and is capable of enduring conditions with lesser amounts of sunlight. Excessive shading can result in weakened, elongated growth and less blooming. Its original habitat is areas with abundant sunlight. Too much shading or overexposure might affect the annual phlox's development adversely.

Best Sunlight Practices

Transplant

6-12 inches

To establish a thriving annual phlox garden, transplant during the prime mid to late spring season, as it provides optimal warmth and sunlight for healthy growth. Choose a well-draining location, offering ample air circulation. If available, shelter annual phlox from strong winds for best results.

Transplant Techniques

Temperature

0 - 38 ℃

Annual phlox is indigenous to areas where temperatures typically range from 68 to 95 °F (20 to 35 ℃). It relishes the warmth and exhibits optimal growth in these conditions. Seasonal adjustments can be made for unusually cold or hot weather to help maintain its preferred temperature range.

Temp for Healthy Growth

Pruning

Spring, Summer, Autumn

A vibrant annual, annual phlox, flourishes with dense clusters of colorful blossoms. Prune early spring for shaping, snipping just above a set of leaves to encourage bushier growth. Deadheading spent blooms throughout blooming season promotes continuous flowering. Late fall, cut back to a few inches above the ground to tidy up the bed. Pruning enhances air circulation, reducing disease risk, and stimulates vigorous, rejuvenating growth each season.

Pruning techniques

Propagation

Spring

Easily propagated through sowing in Spring, annual phlox requires no special attention for success. Once germination occurs, marked by seedling emergence, thin the plants for healthy growth. No specific tips or techniques necessary.

Propagation Techniques

flower wilting

Powdery mildew

Powdery mildew is a prevalent fungal disease affecting Annual phlox. It spreads fast under favorable conditions, causing severe yield loss. The disease leads to poor aesthetic value and weakens the plant, thereby reducing its lifespan.

Lack of fertilizer

Lack of fertilizer is a common issue affecting the growth and development of Annual phlox. Inadequate essential nutrients can result in poor flowering, weak growth, and susceptibility to disease and pests. Providing an appropriate fertilizer regimen is crucial for promoting the health of Annual phlox.

Flower withering

Flower withering is a condition affecting Annual phlox that leads to premature drooping and death of its colorful flowers. Resulting from various factors, this disease significantly impacts Annual phlox's aesthetics and growth, necessitating immediate attention and proper management.

Dark blotch

Dark blotch is a dark, blotchy fungal disease affecting Annual phlox. It occurs primarily on leaves and stems, rendering them unsightly and potentially lethal in severe cases. It's caused by the Alternaria species and is preventable through proper cultural practices and fungicides.

Flower wilting

Flower wilting is a disease that causes Annual phlox's flowering parts to desiccate, shrink and display stunted growth. This significantly compromises the plant's vigor, beauty and seed production, posing a critical threat to its overall health.

Underwatering dry

Underwatering is a non-infectious plant issue caused by insufficient watering leading to dehydration in Annual phlox. The plant may exhibit wilting, slowed growth, and loss of vitality. Early identification and correction are crucial to avoid detrimental effects.

Plant dried up

Plant dried up disease causes desiccation, leading to widespread wilting in Annual phlox. It obstructs the plant's normal functions, leading to a total decline in health and, require immediate rectification measures.

Leaf rot

Leaf rot is a detrimental plant disease affecting Annual phlox species, causing defoliation and plant death if untreated. Its cause is primarily fungal, resulting in apparent symptoms like decolorization, leaf wilting, and rotting. Management and prevention are integral to maintaining plant health.

Feng shui direction

South

The annual phlox manifests harmonious energy when placed in a South facing area of the home. This is largely attributed to the plant's vibrant color, which resonates perfectly within the fiery essence attributed to the South direction in Feng Shui practice.

Fengshui Details

Plants Related to Annual phlox

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Blue daisy

Blue daisy (Felicia amelloides) is an evergreen perennial that is native to the coasts of South Africa. In the 19th century it was introduced to Europe as an ornamental plant and is still commonly cultivated for its vivid flowers. It does well in moist, well-drained soils and in full sun. It dislikes humid conditions.

Blinks

Blinks is distributed widely in wet habitats across the world. It has remained chiefly a wildflower, not typically being cultivated as an ornamental. However, its mat-forming growth would make an excellent ground cover plant in wetter garden environments.

Bladderwort

Bladderwort is a submerged or free-floating, mat-forming carnivorous aquatic plant. It has no root system. Adapted to low-nutrient wetlands, it is found in lakes, on lake edges, and muddy disturbed sites in the lowlands. Bladderwort is classified as a potential specialist invasive species that can outcompete native bladderworts in lowland wetland ecosystems. It is now found in all continents except Antarctica.

Blackberry lily

Blackberry lily (Iris domestica) is a herbaceous perennial that grows from 61 to 91 cm tall. The leaves of the plant grow in fans, similar to those of a gladiolus. It is also called a leopard lily due to its big orange flowers. The blooms are showy and will blossom from summer to early fall. It needs full sun and well-drained soil for optimal growth.

Black spruce

Other names for black spruce (Picea mariana) include bog spruce, shortleaf black spruce, and swamp spruce. And just like you’d guess from the name, it loves soggy habitats. It also happens to be the provincial tree of Newfoundland.

Black cumin

Long valued for its medicinal and healing properties, black cumin is widely available as a dietary supplement. In fact, it is even referenced in Islamic literature. Black cumin has historically been used as a moth repellent and air freshener. Nowadays, it is primarily used as a spice, providing aromatic flavor.

Cape jasmine

Gardenia jasminoides is an evergreen shrub with unique, glossy evergreen leaves and stunning flowers. The sophisticated, matte white flowers are often used in bouquets. The exceptional beauty of this ornamental plant has made it a popular and highly appreciated plant amongst gardeners and horticulturalists.

Golden pothos

The golden pothos (Epipremnum aureum) is a popular houseplant that is commonly seen in Australia, Asia, and the West Indies. It goes by many nicknames, including "devil's ivy", because it is so hard to kill and can even grow in low light conditions. Golden pothos has poisonous sap, so it should be kept away from pets and children.

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Annual phlox

Phlox drummondii

Also known as: Tharp's phlox, Johnston's phlox

Hardiness Zones

4 to 9

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Care Guide for Annual phlox

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Watering Care

Moisture-loving, keep the soil moist but do not let water accumulate.

Soil Care

Loam, Sand, Chalky, Clay, Sandy loam, Alkaline

Ideal Lighting

Full sun, Partial sun

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Questions About Annual phlox

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Watering

Pruning

Sunlight

Temperature

Fertilizing

What is the best way to water my Annual phlox?

What should I do if I water my Annual phlox too much or too little?

How often should I water my Annual phlox?

How much water does my Annual phlox need?

How can I tell if i'm watering my Annual phlox enough?

How should I water my Annual phlox through the seasons?

How should I water my Annual phlox at different growth stages?

What's the difference between watering Annual phlox indoors and outdoors?

Is pruning necessary for my Annual phlox?

How do I prune my Annual phlox?

Are there any cautions I should be careful with when pruning my Annual phlox?

Are there any tips for pruning my Annual phlox?

When should/shouldn't I prune my Annual phlox?

What should I look for when pruning my Annual phlox in different seasons?

How much sunlight should Annual phlox get per day to grow healthily?

What type of sunlight does Annual phlox need?

Can sunlight hurt plants? How to protect Annual phlox from sun and heat damage?

Should I protect Annual phlox from sun exposure?

What will happen if Annual phlox gets inadequate sunlight?

Does Annual phlox need special care about sunlight during its different growth stages?

How much light does Annual phlox need for photosynthesis?

Are there any cautions or tips for sunlight and Annual phlox?

What is the optimal temperature for Annual phlox?

Temperature requirements for first year or seedling Annual phlox

How can I protect Annual phlox from extreme temperatures?

Dormant season temperature recommendations for Annual phlox

Why do I need to fertilize my Annual phlox?

When is the best time to fertilize my Annual phlox?

When should I avoid fertilizing my Annual phlox?

What type of fertilizer does my Annual phlox need?

How do I fertilize my Annual phlox?

What happens if I fertilize my Annual phlox too much?

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Key Facts About Annual phlox

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Attributes of Annual phlox

Lifespan

Annual, Biennial, Perennial

Plant Type

Herb

Planting Time

Spring

Bloom Time

Spring, Summer, Fall

Harvest Time

Fall

Plant Height

25 cm

Spread

15 cm to 45 cm

Leaf Color

Green

Flower Size

2.5 cm

Flower Color

White

Pink

Red

Purple

Yellow

Cream

Blue

Lavender

Fruit Color

Brown

Stem Color

Green

Blue

Orange

Cream

Dormancy

Winter dormancy

Leaf type

Deciduous

Ideal Temperature

20 - 35 ℃

Growth Season

Spring, Summer

Pollinators

Butterflies

Benefits to Pollinating Insects

Adult food

Growth Rate

Rapid

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Symbolism

Our souls are united.

Usages

Garden Use

Scientific Classification of Annual phlox

Phylum

Class

Order

Family

Genus

Species

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Common Pests & Diseases About Annual phlox

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Common issues for Annual phlox based on 10 million real cases

flower wilting

Learn More About the flower wilting

Caterpillars

Caterpillars are fleshy moth or butterfly larvae that come in an array of colors, patterns, and even hairstyles. They chew on leaves and flower petals, creating large, irregular holes.

Learn More About the Caterpillars

Aged yellow and dry

Natural aging can cause leaves to turn yellow and dry out.

Learn More About the Aged yellow and dry

Powdery Mildew

Powdery mildew is a white mold that appears on leaves. It can be wiped away.

Learn More About the Powdery Mildew

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Distribution of Annual phlox

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Habitat of Annual phlox

Roadsides, fields, waste places, grasslands, open woodlands

Northern Hemisphere

South Hemisphere

Distribution Map of Annual phlox

Native

Cultivated

Invasive

Potentially invasive

Exotic

No species reported

More Info on Annual Phlox Growth and Care

Basic Care Guide

Common Pests & Diseases

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Spring, Summer, Autumn

Plants Related to Annual phlox

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Indoor

Requirements

Full sun

Ideal

Above 6 hours sunlight

Partial sun

Tolerance

About 3-6 hours sunlight

Watch how sunlight gracefully moves through your garden, and choose spots that provide the perfect balance of light and shade for your plants, ensuring their happiness.

Essentials

Preferred

Tolerable

Unsuitable

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Artificial lighting

Indoor plants require adequate lighting for optimal growth. When natural sunlight is insufficient, particularly in winter or in less sunny spaces, artificial lights offer a vital solution, promoting faster, healthier growth.
1. Choose the right type of artificial light: LED lights are a popular choice for indoor plant lighting because they can be customized to provide the specific wavelengths of light that your plants need.
Full sun plants need 30-50W/sq ft of artificial light, partial sun plants need 20-30W/sq ft, and full shade plants need 10-20W/sq ft.
2. Determine the appropriate distance: Place the light source 12-36 inches above the plant to mimic natural sunlight.
3. Determine the duration: Mimic the length of natural daylight hours for your plant species. most plants need 8-12 hours of light per day.

Important Symptoms

Symptoms of Insufficient Light in %s

Annual phlox, a plant that thrives in full sunlight, is commonly grown outdoors with ample sunlight. When cultivated indoors with inadequate light, it may exhibit subtle symptoms of light deficiency.

(Symptom details and solutions)

Small leaves

New leaves may grow smaller in size compared to the previous ones once they have matured.

Leggy or sparse growth

The spaces between leaves or stems of your annual phlox may become longer, resulting in a thin and stretched-out appearance. This can make the plant look sparse and weak, and it may easily break or lean due to its own weight.

Faster leaf drop

When plants are exposed to low light conditions, they tend to shed older leaves early to conserve resources. Within a limited time, these resources can be utilized to grow new leaves until the plant's energy reserves are depleted.

Slower or no new growth

Annual phlox enters a survival mode when light conditions are poor, which leads to a halt in leaf production. As a result, the plant's growth becomes delayed or stops altogether.

Lighter-colored new leaves

Insufficient sunlight can cause leaves to develop irregular color patterns or appear pale. This indicates a lack of chlorophyll and essential nutrients.

Solutions

1. To ensure optimal growth, gradually move plants to a sunnier location each week, until they receive at least 6 hours of direct sunlight daily. Use a south-facing window and keep curtains open during the day for maximum sunlight exposure and nutrient accumulation.2. To provide additional light for your plant, consider using artificial light if it's large or not easily movable. Keep a desk or ceiling lamp on for at least 8 hours daily, or invest in professional plant grow lights for ample light.

Symptoms of Excessive light in %s

Annual phlox thrives in full sun exposure and can tolerate intense sunlight. With their remarkable resilience, symptoms of sunburn may not be easily visible, as they rarely suffer from it.

(Symptom details and solutions)

Chlorosis

Chlorosis is a condition where the plant's leaves lose their green color and turn yellow. This is due to the breakdown of chlorophyll from excessive sunlight, which negatively affects the plant's ability to photosynthesize.

Sunscald

Sunscald occurs when the plant's leaves or stems are damaged by intense sunlight exposure. It appears as pale, bleached, or necrotic areas on the plant tissue and can reduce the plant's overall health.

Leaf Curling

Leaf curling is a symptom where leaves curl or twist under extreme sunlight conditions. This is a defense mechanism used by the plant to reduce its surface area exposed to sunlight, minimizing water loss and damage.

Wilting

Wilting occurs when a plant loses turgor pressure and its leaves and stems begin to droop. Overexposure to sunlight can cause wilting by increasing the plant's water loss through transpiration, making it difficult for the plant to maintain adequate hydration.

Leaf Scorching

Leaf scorching is a symptom characterized by the appearance of brown, dry, and crispy edges or patches on leaves due to excessive sunlight. This can lead to a reduction in photosynthetic capacity and overall plant health.

Solutions

1. Move your plant to the optimal position where it can receive abundant sunlight but also have some shade. An east-facing window is an ideal choice as the morning sunlight is gentler. This way, your plant can enjoy ample sunlight while reducing the risk of sunburn.2. It is recommended to trim off any completely dehydrated or withered parts of the plant.

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Indoor

Requirements

Ideal

Tolerable

Unsuitable

Just like people, each plant has its own preferences. Learn about your plants' temperature needs and create a comforting environment for them to flourish. As you care for your plants, your bond with them will deepen. Trust your intuition as you learn about their temperature needs, celebrating the journey you share. Lovingly monitor the temperature around your plants and adjust their environment as needed. A thermometer can be your ally in this heartfelt endeavor. Be patient and gentle with yourself as you explore your plants' temperature needs. Cherish your successes, learn from challenges, and nurture your garden with love, creating a haven that reflects the warmth of your care.

Essentials

Regional wintering strategies

Annual phlox has strong cold resistance, so special frost protection measures are usually not necessary during winter. However, if the winter temperatures are expected to drop below {Limit_growth_temperature}, it is still important to provide cold protection. This can be achieved by covering the plant with materials such as soil or straw. Before the first freeze in autumn, it is recommended to water the plant abundantly, ensuring the soil remains moist and enters a frozen state. This helps prevent drought and water scarcity for the plant during winter and early spring.

Important Symptoms

Symptoms of Low Temperature in Annual phlox

Annual phlox is cold-tolerant and thrives best when the temperature is above {Suitable_growth_temperature_min}. During winter, it should be kept above {Tolerable_growing_temperature_min}. When the temperature falls below {Limit_growth_temperature}, although there may not be any noticeable changes during winter, there may be a decrease in sprouting or even no sprouting during springtime.

Solutions

In spring, remove any parts that have failed to sprout.

Symptoms of High Temperature in Annual phlox

During summer, Annual phlox should be kept below {Suitable_growth_temperature_max}. When the temperature exceeds {Tolerable_growing_temperature_max}, the leaves of the plant may become lighter in color, prone to curling, susceptible to sunburn, and in severe cases, the entire plant may wilt and become dry.

Solutions

Trim away the sunburned and dried-up parts. Move the plant to a location that provides shade from the midday and afternoon sun, or use a shade cloth to create shade. Water the plant in the morning and evening to keep the soil moist.

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Care Guide for Annual phlox

Questions About Annual phlox

More Questions People Also Ask

Key Facts About Annual phlox

Attributes of Annual phlox

Symbolism

Usages

Scientific Classification of Annual phlox

Common Pests & Diseases About Annual phlox

Distribution of Annual phlox

Habitat of Annual phlox

Distribution Map of Annual phlox

More Info on Annual Phlox Growth and Care

Plants Related to Annual phlox

Care Guide for Annual phlox

Questions About Annual phlox

More Questions People Also Ask

Key Facts About Annual phlox

Attributes of Annual phlox

Symbolism

Usages

Scientific Classification of Annual phlox

Common Pests & Diseases About Annual phlox

Distribution of Annual phlox

Habitat of Annual phlox

Distribution Map of Annual phlox

More Info on Annual Phlox Growth and Care

Plants Related to Annual phlox