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Plant Encyclopedia > Welsh onion

Care Guide for Welsh onion

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Watering Care

Average water needs, watering when the top 3 cm of soil has dried out.

Details on Watering Care

Fertilizing Care

Apply fertilizer to the mature welsh onion tree every few years during the early growing season. You can test the soil of underdeveloped trees to see which nutrients are lacking and apply a fertilizer that can supply those nutrients. Slow-release fertilizers worked into the soil can help the tree absorb the nutrients effectively over time.

Details on Fertilizing Care

Pruning

Trim the diseased, withered leaves once a month.

Details on Pruning

Soil Care

Sand, Loam, Acidic, Neutral, Alkaline

Details on Soil Care

Repotting

Needs excellent drainage in pots.

Details on Repotting

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Welsh onion

Water

Every week

Hardiness Zones

4 to 9

Planting Time

All year around

Questions About Welsh onion

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Watering

Pruning

Sunlight

Temperature

Fertilizing

What is the best way to water my Welsh onion?

Not only does the Welsh onion have certain preferences regarding how much water it receives, but it also cares deeply about how you provide that water. In fact, if you don't use the proper watering technique, you risk harming your tomatoes. The best way to water Welsh onion is to apply the water directly to the soil in a slow and gentle manner. You should not pour all of the water into the soil at once, and you should not do overhead watering for your Welsh onion. Although you should water slowly, you should also water deeply to ensure that all of the soil in which your Welsh onion grows is sufficiently moist.

What should I do if I water my Welsh onion too much or too little?

If you find that you have overwatered your Welsh onion and you are concerned about the associated risk of disease, you should intervene immediately. Often the best approach for an overwatered Welsh onion is to uproot it from its current growing location. Once the plant is out of the ground, you can allow its roots to dry a bit before planting it in a new growing location. Ensure that the new growing location has soil with good drainage. If you grow in pots, you may also want to move your plant to a pot with more or larger drainage holes. In the case of underwatering, all you will need to do is increase the frequency with which you supply water to your plant.

How often should I water my Welsh onion?

Overall, Welsh onion requires a significant amount of water throughout the growing season. To meet that high water need, you'll need to water early and often throughout the spring and summer. During the earlier parts of the growing season, you should water your Welsh onion about once or twice per week. As the season progresses, you should increase your watering frequency. You may need to water it twice per day or more during summer, depending on the weather. After your Welsh onion have gone through their major seasonal growth phases, you can reduce the frequency of your watering to about once per week until the end of the growing season.

How much water does my Welsh onion need?

Since Welsh onion are incredibly popular, with many professional and amateur gardeners growing them successfully, we have a pretty clear idea of how to care for these plants. That understanding includes specific knowledge about the precise volume of water an average Welsh onion should receive. Generally, Welsh onion will require about 1 - 1.5 inches of water per week. That volume should be dispersed evenly through your weekly watering. As the weather gets warmer, you may need to supply more water, but in most cases, two inches per week is a good baseline amount.

How can I tell if i'm watering my Welsh onion enough?

Underwatering and overwatering can both occur as problems for your Welsh onion, and both these problems can manifest with similar symptoms. For example, foliage discoloration and wilting can both result from either overwatering or underwatering. When your Welsh onion is underwatered, its leaves will be curling and drooping at the beginning. You will see a bunch of leaves turn less vigorous. Underwatering is also likely to cause stunted growth and poor overall development as both the flowers and this plant require a high amount of water. Overwatering is more likely to lead to disease, including rot. Overwatering may also lead to unpleasant smells rising from your plant's soil. The symptoms of underwatering will show up quicker than overwatering. Overwatering can also be evident in soil conditions. Mainly, if you notice a lot of standing water or waterlogged soils, overwatering is likely to occur.

How should I water my Welsh onion through the seasons?

As alluded to above, your Welsh onion's water needs will repeatedly change throughout the seasons. During most of spring and summer, you should water your Welsh onion about once every week. As the heat of summer arrives, you should plan to increase your watering frequency to once or twice per day. In the late summer and fall, towards the end of the harvest period, you can reduce your watering frequency to about once per week. After harvest has ended, you can cease watering as your Welsh onion has reached the end of its life cycle and will require no further soil moisture. The maintenance schedule of Welsh onion will require you to alter the amount of water you provide depending on the plant's current growth stage. Early on, especially if you grow your Welsh onion from seeds, you'll need to provide water often enough to maintain consistent soil moisture, which encourages root development. When the plant becomes old enough to produce flowers, it will likely need even more water. During the fruit development growth stage, your Welsh onion will likely need the most water out of any growth period, at times requiring water more than twice per day. Following that phase, the water needs of Welsh onion will decline significantly.

What's the difference between watering Welsh onion indoors and outdoors?

Whether you grow Welsh onion indoors or outdoors can also play a role in how you water them. Welsh onion that grows outdoors may receive water from natural rainfall, which will reduce the amount of supplemental water you should supply. However, it is incredibly rare for rainfall to adequately replace your watering entirely. Plants that grow indoors, along with any Welsh onion that grows in a container, will need to be watered more frequently than those that grow in the ground outdoors. If you choose this route, please make sure that the plant gets enough water by checking the soil moisture within your pot often to keep your Welsh onion healthy.

When should I prune my Welsh onion?

You can prune your Welsh onion any time you notice dead, diseased, or damaged leaves during the growing season. Once you notice such a leave, locate an unwanted leaf, then follow its stem all the way to the bottom of petiole. Removing dead stems will increase the light and ventilation of the plant and help it to grow. You can cut its stem just above the soil’s surface to remove it. Such pruning can take place as needed during spring and summer. Also, this plant can bloom any time between spring and fall, and some gardeners choose to remove flower buds before they have a chance to open. Removing unopened flower buds allows this plant to focus most of its growing energy on its beautiful leaves. However, pruning in this manner does not necessarily influence the plant’s overall health. Cutting back should be done late in the winter to early spring. Ideally, you should wait until you see new basal growth before you cut off the dead and dried winter parts, to about 6 inches from the ground.

How can I prune my Welsh onion?

Pruning the Welsh onion is as easy as waiting until you notice dead or damaged leaves on your plant. When you recognize these leaves, equip yourself with a pair of sharp and sterile hand pruning shears. Hand pruning shears will work best as larger tools like loppers will not be well suited to the precise cuts you need to make. Once you have a proper set of pruning tools, locate an unwanted leaf, then follow its stem all the way to the bottom of petiole. Removing dead stems will increase the light and ventilation of the plant and help it to grow. Cut the stem just above where it exits the soil to remove it entirely. If you wish to stop this plant from flowering, you can use the same pruning shears to remove any buds before they open. Finally, you may prefer to just trim off dead or damaged portions of the plant, including deadheading spent flowers, to keep it looking its best. This can be done at any time of year. Diseased or damaged stems should be cut right at the soil line and removed completely. Blooms should be cut off just below the flower head. Cutting back should be done late in the winter to early spring. Ideally, you should wait until you see new basal growth before you cut off the dead and dried winter parts to about 6 inches from the ground.

What should I do after pruning my Welsh onion?

All that is required of you once you have pruned your Welsh onion is to clean up. Once you have pruned, deadheaded, or cut back your Welsh onion, gather the bits you have cut off and discard them. If there are any diseased parts of the plant that you have pruned away, do not discard them with the rest of the pruned pieces. Diseased foliage should be disposed of. When watering after pruning, be careful not to touch the wound to prevent fungus from infecting the plant through the fresh wound. Placing Welsh onion in a well-ventilated location will also help the wound to dry out and heal in time.

Are there any tips for pruning my Welsh onion?

For your major pruning, use sharp pruning sheers that will make clean cuts to avoid damaging your plants. As you are pruning your Welsh onion, step back occasionally to check the appearance of the plant to make sure it has the shape you want and that you are pruning it symmetricaly. It is recommended that gloves and safety glasses be worn while pruning Welsh onion.

Are there any instructions for pruning my Welsh onion?

Pruning is an important part of plant care and maintenance. Different plants have different pruning requirements. Some plants may need little to no pruning, while others may require more specific attention. Most plants should be pruned to remove damaged or unhealthy foliage. Other plants may be pruned to control their shape and size. Pruning may even be done to remove the flower heads of plants and stop them from self-seeding. Although some gardeners may find pruning a tedious task, it is a necessary evil and is an essential part of keeping your plants happy and healthy.

How much sunlight does Welsh onion need to grow?

Exact needs vary, but a minimum of 6 to 8 hours per day is a good rule of thumb for Welsh onion to grow and produce fruit.

What type of sunlight does Welsh onion need?

Welsh onion requires full sun, meaning that it should be grown in a location that gets direct sunlight that isn’t blocked by obstacles such as trees, fences, or buildings. In general, the faster the plant grows, the more hours of sunlight it will need. Morning sun is best for photosynthesis.

Should I protect Welsh onion from sun exposure?

Welsh onion should not need to be protected from the sun in most climates. Those who live in a desert or near the equator may find that the sun is too harsh for the types of plants they want to grow, but this is the exception.

What will happen if Welsh onion doesn't get enough sunlight?

All plants need sunlight to convert into energy. Plants that have a short growing season need even more light and energy than those that grow slowly, as they need to complete all their processes to grow and produce fruit within just a few months. The first symptoms of insufficient sunlight in Welsh onion are pale and yellow leaves that are not able to generate enough chlorophyll to keep their healthy green color. The leaves may eventually fall off, and new growth is small and weak. The plant may become leggy and sparse as it stretches toward the available light. Finally, without enough light the plant will not be able to produce large, high-quality edible leaves or fruit. Welsh onion needs to devote a lot of energy into growing leaves and fruits, so if there isn’t enough light available for it to convert, the harvest will suffer.

What will happen if Welsh onion gets too much sunlight?

Welsh onion can get sunburned from intense sunlight, especially when coupled with high temperatures and not having enough water. Afternoon sun tends to be most likely to burn plants. Scalded leaves develop faded patches of light brown to white on the areas at the top of the plant that are exposed to the most sun. They are especially vulnerable to this right after being transplanted from a shadier location to being in full sun. Transitioning plants gradually or providing them with a barrier while they are adjusting can help prevent sunscald in young plants. In many cases, Welsh onion develops leaves that are large enough to protect fruits from the strongest rays of the sun. However, if intense sunlight is in contact with fruits, they can also be damaged. Avoid over-pruning those protective leaves so that the fruits don’t get burned.

Are there any cautions or tips for sunlight and Welsh onion?

Welsh onion may become unbalanced if it gets significantly more light on one side than the other. Ideally, you can plant your Welsh onion in a location away from obstacles that might block light, and where the distribution of sunlight is even on all sides. Be careful about planting tall species next to those that grow closer to the ground. It may not be obvious when the crops are first planted, but over time the taller plants may begin to block the amount of sunlight that can reach the shorter plants. Morning sun helps to dry dew and precipitation, which helps prevent infection from diseases that can develop when water sits on the plant. If you are watering or irrigating your Welsh onion, this should be done in the morning.

What is the optimal temperature for Welsh onion?

There is an ideal temperature range that makes Welsh onion feel at home. Under these temperature conditions, it's unlikely that you’ll have any issues with cold or hot damage to the foliage, but changing leaf colors can absolutely be a sign that Welsh onion isn’t happy. Try to keep your Welsh onion well within its preferred range of 70-85℉(21-30℃), but don’t panic if the temperature creeps up past 85℉(30℃) during the day or down to 70℉(21℃) at night.

How can I protect Welsh onion from extreme temperatures outdoors?

If your Welsh onion happens to be planted outside, then there’s not much you can do to try to move it indoors. However, you can certainly provide cover in ways that will help it survive any extreme temperatures that may arise unexpectedly. For instance, you can always use a few stakes and some cloth to put together a shade tent that will block out much of the sun’s intense heat from direct sunlight exposure. Similarly, Welsh onion can be protected from the extreme cold and especially chilly winds by building a small greenhouse around the plant, which will create a greenhouse effect and warm the plant up. This can be done using garden stakes and any sort of clear or translucent plastic you may have around; if you have greenhouse plastic such as polycarbonate laying around, this works perfectly. Remove the greenhouse once temperatures warm up to 40℉(10℃) at night.

Does Welsh onion need different temperatures in different seasons?

Generally speaking, Welsh onion needs to stay within its preferred temperature range all year long. However, that doesn’t mean that care should stay the same all year long. During the warmest months of the year, Welsh onion will need a little extra shade and a bit more of a breeze to help it cope with the hottest days. On the other hand, it may need to be moved away from chilly windows and doors during the cooler months in climates where temperatures drop below 40℉(10℃) at any point in the year.

What is the best way to maintain the right temperature for my Welsh onion?

Keeping your Welsh onion at the right temperature can be fairly simple. Depending on where you grow it, Welsh onion can be fairly easy to accommodate. For indoor growing, you can easily move the plant to different locations within your indoor space that best meet its temperature requirements. Avoid placing it near air conditioning vents, heaters, doors that open frequently, or drafty windows. It is a little more difficult to control the temperature around your Welsh onion if it’s grown outside. Of course, if it’s planted in a pot, you can simply bring it indoors when the temperatures outside get too hot or too cold for Welsh onion, but otherwise, you may need to take different measures to protect it from extreme heat or cold that may damage it irreversibly. Try placing Welsh onion under cover to protect from both the harsh sun that can overheat it and any cold wind that could be potentially deadly for your plant.

Why do I need to fertilize my Welsh onion?

While all plants require certain essential nutrients to develop properly, Welsh onion has particular needs because it is grown specifically for its edible leaves. Each of the main nutrients that plants use (nitrogen, phosphorus, and potassium) contribute to one or more of a plant’s essential functions, and in the case of foliage it is nitrogen that provides the most support. It can be difficult for a Welsh onion to get enough nitrogen from the soil to develop a satisfying harvest, which is why many gardeners prefer to supplement by feeding Welsh onion heavily with a source of nitrogen.

When is the best time to fertilize my Welsh onion?

There are several points during the growing season that you should apply fertilizer to benefit your Welsh onion. The initial application occurs when you prepare the ground to be planted, at least 2 to 8 weeks before planting, amend the soil thoroughly with nutrient-rich organic material such as compost or manure. Amend the soil again at planting time, using the same method. After your seedlings emerge, wait until they reach around 2 inches tall before applying the next dose of fertilizer. After that, you can continue to regularly feed your Welsh onion with rich organic matter or a commercial fertilizer until you harvest. A typical schedule would be to fertilize every two to three weeks. It is also a good idea to add a layer of compost or manure around the plant to provide a continuous supply of nutrients.

When should I avoid fertilizing my Welsh onion?

Remember that nitrogen-rich fertilizers are best for growing a lot of healthy foliage, so be careful about applying this near other vegetable plants that need to focus their energy on fruiting instead of foliage. You could end up with a vegetable plant that produces lots of leaves but very few vegetables. Avoid letting any type of fertilizer touch or splash onto the leaves of your Welsh onion, since this will burn them. It is a good idea to apply it at least a couple of inches away from the base of the plant. If your Welsh onion is unhealthy due to disease, pests, drought, or other reasons, it should not be fertilized until those other issues are resolved. Fertilizer can give a boost to otherwise healthy plants, but it can actually cause damage if applied while the plant is not in good condition.

What type of fertilizer does my Welsh onion need?

There is not a one-size-fits-all answer to the best type of fertilizer for Welsh onion, since the right depends on the specific type of plant being grown, the environmental conditions, and most importantly the composition of the soil. However, as Welsh onion requires a lot of nitrogen, it is generally a safe bet to use high-nitrogen fertilizers. Manure or compost is the best choice for amending soil at the beginning of the growing season, and then feeding for the rest of the season can be done with a dry or liquid fertilizer. Feed lightly during the seedling stage, then steadily increase as the plant matures. Many people find that vegetables grown with organic fertilizers have a superior taste to those grown with chemical fertilizers, but both will work. Some popular high-nitrogen organic options include fish emulsion, soil meal, compost tea, alfalfa meal, blood meal, and chicken manure. When using chemical fertilizers, check the NPK number which indicates the relative proportion of the three macronutrients nitrogen, phosphorus, and potassium in the mixture. Since you want a high-nitrogen option, choose one where the first number is highest such as a 13-2-5, or even one that only contains nitrogen like a 16-0-0.

How do I fertilize my Welsh onion?

There are several ways to fertilize your Welsh onion, depending on the type of fertilizer. For amending soil, the method is to dig at least 6 inches (and preferably deeper) into the soil and then incorporate your amendment at a 2:1 ratio of soil to amendment material. Mix them together well. Granular or powder fertilizers should be spread around the base of the plant in the amount recommended by the retailer. It is a good idea to mix this material into the top layer of soil to prevent it from washing or blowing away. Apply fertilizer about 2 to 3 inches away from the plant to avoid fertilizer burn. Always water thoroughly immediately after adding a dry fertilizer to soil. Water soluble chemical fertilizers can be dissolved into water and then that diluted fertilizer mix is used to water plants. This method will only be suitable if you water your Welsh onion from a container and not by irrigation or other methods.

What happens if I fertilize my Welsh onion too much?

Nitrogen in particular can cause fertilizer burn so using high-nitrogen fertilizer does carry some risks. Over-fertilizing results in stunted growth, outer outer leaves turning yellow, and possibly wilting. Since Welsh onion grows fast and is harvested within just a few months of planting, it may not be worthwhile to try to save an over-fertilized patch of garden. Instead, start over with new seeds in another part of the garden and consider it a lesson learned about how much fertilizer is needed to suit your specific conditions.

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Key Facts About Welsh onion

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Attributes of Welsh onion

Lifespan

Perennial

Plant Type

Herb

Planting Time

All year around

Bloom Time

Late spring, Summer

Harvest Time

All year around

Plant Height

30 cm to 91 cm

Spread

10 cm

Leaf Color

Green

Flower Size

2.5 cm

Flower Color

White

Yellow

Cream

Stem Color

Green

Leaf type

Semi-evergreen

Ideal Temperature

5 - 35 ℃

Symbolism

Protection, Exorcism, Healing

Scientific Classification of Welsh onion

Phylum

Class

Order

Family

Genus

Species

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Common Pests & Diseases About Welsh onion

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Common issues for Welsh onion based on 10 million real cases

Leaf tip withering

Leaf tip withering is a disease that impacts the health and yield of Welsh onion. This condition can significantly reduce the plant's productivity and quality, leading to brown, wilted leaf tips and impaired growth.

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.

Leaf scorch

Leaf blight causes leaves to dry out and turn brown starting at their tips.

Solutions: The solution to leaf scorch will depend on the cause, however, in general all cultural care methods that improve plant health and root functionality will reduce symptoms. Mulching the root zone (preferably with wood chip mulch) helps retain moisture, reduce evaporation, and promotes a healthy, functional root environment that is critical for water movement to the leaves. Check the root collar for girdling or circling roots that strangle the trunk and limit water and nutrient movement. Protect trees from severe root damage of nearby construction and excavation. If fertilizer burn is to blame, irrigate the soil deeply to flush out excess fertilizer salts. However, keep in mind that fertilizer runoff is an environmental pollutant. Avoiding excess fertilization in the first place is the best approach. If soil testing has revealed a potassium deficiency, apply a potassium fertilizer and water well. Even if you have enough potassium in the soil, plants will not be able to take it up if the soil is consistently too dry. Severely affected twigs may be removed using a pair of sharp and sanitized pruning shears, as weakened branches are susceptible to secondary infections. If your plant has bacterial leaf scorch, there is no cure. Antibiotic injections applied by a professional can reduce symptoms for a season, however, the above cultural management methods are the best options to reduce symptoms and prolong life. An infected plant will likely die within ten years.

Flower withering

Flowers may dry out due to a sudden change in environment or because the plant has completed its normal flowering period.

Solutions: If flower withering is a natural progression due to age, there is nothing that can be done to slow or stop the process. Once hormones within the plant begin the process of senescence, it’s irreversible. For lack of water, immediately water the plant using room temperature rainwater, bottled spring water, or filtered tap water. Water container plants until excess water drains out the bottom; water in-ground plants until the soil is soaked but there isn’t standing water on the surface. In the event of nutritional deficiencies, the best solution is to use a granular or water-soluble liquid fertilizer, and apply it to the soil at about half the recommended dosage. Keep it off the leaves and make sure granular products are watered into the soil well. If the plant is infected with a bacterial or fungal pathogen, there is no course of treatment that cures the diseased plants. The best solution is to remove the infected plants and dispose of the plant material off-site. Do not put in a compost pile.

Fruit withering

Fungal infection or normal ripening can cause the fruit to dry out.

Solutions: There are a number of appropriate solutions to control fruit withering: Remove any fruit as soon as it shows any signs of infection. Do not compost. Use a fungicide prior to leaf bud and then as per manufacturers instructions throughout the season.

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Distribution of Welsh onion

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Habitat of Welsh onion

Cultivated Beds

Northern Hemisphere

South Hemisphere

Distribution Map of Welsh onion

Welsh onion is indigenous to parts of East Asia and has been introduced to numerous regions across temperate and tropical zones. It thrives in diversified environments, with a presence established on continents such as Europe, North America, and parts of Southeast Asia. This perennial plant is also cultivated widely, indicating its successful adaptation beyond its native range.

Native

Cultivated

Invasive

Potentially invasive

Exotic

No species reported

More Info on Welsh Onion Growth and Care

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Basic Care Guide

Common Pests & Diseases

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Lighting

Full sun

Welsh onion appreciates numerous hours of unobstructed solar exposure daily and can withstand a degree of shade. The rays of the sun aid welsh onion in achieving peak wellness and growth. In its native territories, it thrives in open areas where sunshine is abundant. Too much or too little sun can negatively influence its health, causing wilting or stunted growth.

Best Sunlight Practices

Transplant

1-2 feet

The perfect time to transplant welsh onion is during the S1-S2 season, when their roots have ample time to establish in the cooler months. Welsh onion fare best in sunny to partially shaded locations. For a successful transplantation, ensure the soil is well-drained and rich in organic matter.

Transplant Techniques

Temperature

-25 - 38 ℃

Welsh onion is native to temperate regions and prefers a cooler environment. It thrives when the temperature ranges from 41 to 95 °F (5 to 35 ℃). Seasonal temperature changes should be monitored to ensure optimum growth conditions.

Temp for Healthy Growth

Leaf tip withering

Feng shui direction

Southwest

The welsh onion is often perceived as harmonious in the Southwest-facing direction. This outlook subscribes to the timeless Feng Shui principle of 'Earth,' which governs the Southwest. The welsh onion's sturdy, upright growth subtly mirrors the robust, grounding energy of the Earth element, potentially contributing to a sense of stability and balance in the environment. As with all Feng Shui concepts, personal experience is paramount.

Fengshui Details

Plants Related to Welsh onion

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Sacred garlic pear

Sacred garlic pear (Crateva religiosa) is a common sight in India around temples and religious sites because it is considered a sacred tree. This belief is reflected in the 'religiosa' part of its Latin name. You can see this tree in ornamental gardens worldwide, where it is grown for its complex and attractive yellow-white flowers.

Rio grande copper lily

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Singapore holly

Singapore holly (Malpighia coccigera) is a low-growing evergreen shrub whose dark green leaves are like holly leaves, although it is not a true holly. It blooms in summer with white or pink, trumpet-shaped flowers. Red berries ripen soon after, attracting a variety of birds. It has been used as a bonsai tree.

Parasol whitetop

Parasol whitetop (Doellingeria umbellata) is a deciduous perennial with dark green foliage. It blooms from late summer to early fall with white, daisy-like blossoms with yellow centers. Cut back in fall to encourage new growth in spring. Thrives in full sun and moist, well-drained soil.

Yellow alder

Yellow alder (Turnera ulmifolia) is a perennial wildflower often found growing along roadsides. It grows erect to 91 cm tall with dark green foliage and bright yellow flowers. Blooms repeatedly and is considered a weed by most. Grows in cultivated and disturbed sites.

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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Welsh onion

Allium fistulosum

Also known as: Bunching onion, Spring onion

Welsh onion (Allium fistulosum) is cultivated for its onion-flavored leaves, which are used like scallions. Originally from Asia, it was brought to Europe in the 17th century and has now naturalized in various parts of North America, including Canada, Alaska and areas of the northern United States.

Hardiness Zones

4 to 9

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Care Guide for Welsh onion

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Watering Care

Average water needs, watering when the top 3 cm of soil has dried out.

Fertilizing Care

Pruning

Trim the diseased, withered leaves once a month.

Soil Care

Sand, Loam, Acidic, Neutral, Alkaline

Repotting

Needs excellent drainage in pots.

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Questions About Welsh onion

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Watering

Pruning

Sunlight

Temperature

Fertilizing

What is the best way to water my Welsh onion?

What should I do if I water my Welsh onion too much or too little?

How often should I water my Welsh onion?

How much water does my Welsh onion need?

How can I tell if i'm watering my Welsh onion enough?

How should I water my Welsh onion through the seasons?

What's the difference between watering Welsh onion indoors and outdoors?

When should I prune my Welsh onion?

How can I prune my Welsh onion?

What should I do after pruning my Welsh onion?

Are there any tips for pruning my Welsh onion?

Are there any instructions for pruning my Welsh onion?

How much sunlight does Welsh onion need to grow?

What type of sunlight does Welsh onion need?

Should I protect Welsh onion from sun exposure?

What will happen if Welsh onion doesn't get enough sunlight?

What will happen if Welsh onion gets too much sunlight?

Are there any cautions or tips for sunlight and Welsh onion?

What is the optimal temperature for Welsh onion?

How can I protect Welsh onion from extreme temperatures outdoors?

Does Welsh onion need different temperatures in different seasons?

What is the best way to maintain the right temperature for my Welsh onion?

Why do I need to fertilize my Welsh onion?

When is the best time to fertilize my Welsh onion?

When should I avoid fertilizing my Welsh onion?

What type of fertilizer does my Welsh onion need?

How do I fertilize my Welsh onion?

What happens if I fertilize my Welsh onion too much?

Get tips and tricks for your plants.

Keep your plants happy and healthy with our guide to watering, lighting, feeding and more.

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Key Facts About Welsh onion

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Attributes of Welsh onion

Lifespan

Perennial

Plant Type

Herb

Planting Time

All year around

Bloom Time

Late spring, Summer

Harvest Time

All year around

Plant Height

30 cm to 91 cm

Spread

10 cm

Leaf Color

Green

Flower Size

2.5 cm

Flower Color

White

Yellow

Cream

Stem Color

Green

Leaf type

Semi-evergreen

Ideal Temperature

5 - 35 ℃

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Symbolism

Protection, Exorcism, Healing

Scientific Classification of Welsh onion

Phylum

Class

Order

Family

Genus

Species

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Common Pests & Diseases About Welsh onion

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Common issues for Welsh onion based on 10 million real cases

Leaf tip withering

Learn More About the Leaf tip withering

Aged yellow and dry

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

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Leaf scorch

Leaf blight causes leaves to dry out and turn brown starting at their tips.

Learn More About the Leaf scorch

Flower withering

Flowers may dry out due to a sudden change in environment or because the plant has completed its normal flowering period.

Learn More About the Flower withering

Fruit withering

Fungal infection or normal ripening can cause the fruit to dry out.

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Distribution of Welsh onion

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Habitat of Welsh onion

Cultivated Beds

Northern Hemisphere

South Hemisphere

Distribution Map of Welsh onion

Native

Cultivated

Invasive

Potentially invasive

Exotic

No species reported

More Info on Welsh Onion Growth and Care

Basic Care Guide

Common Pests & Diseases

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Plants Related to Welsh onion

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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

Welsh onion thrives in full sunlight and is commonly cultivated outdoors. When grown indoors with limited light, it may exhibit subtle symptoms of light deficiency that can easily go unnoticed.

(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 Welsh onion 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

Welsh onion 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

Welsh onion 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

Welsh onion prefers relatively warm temperatures, so maintaining temperatures above {Suitable_growth_temperature_min} during winter cultivation is beneficial for plant growth. The minimum temperature should be kept above freezing point to prevent the plant from freezing damage. When the outdoor temperature approaches -5°C (25°F) during winter, it is advisable to bring Welsh onion indoors or provide protection by setting up a temporary greenhouse or using materials such as plastic film or fabric to wrap the plant.

Important Symptoms

Symptoms of Low Temperature in Welsh onion

Welsh onion has moderate tolerance to low temperatures and thrives best when the temperature is between {Suitable_growth_temperature_min} and {Suitable_growth_temperature_max}. During winter, it should be kept above {Tolerable_growing_temperature_min}. When the temperature falls below {Limit_growth_temperature}, the leaves may darken in color. In severe cases, water-soaked necrosis, wilting, and drooping may occur, and the color of the leaves gradually turns brown.

Solutions

Trim away the frost-damaged parts. Immediately move indoors to a warm environment or set up a makeshift greenhouse for cold protection. When placing the plant indoors, choose a location near a south-facing window to ensure ample sunlight. If there is insufficient light, you can use supplemental lighting.

Symptoms of High Temperature in Welsh onion

During summer, Welsh onion should be kept below {Suitable_growth_temperature_max}. When the temperature exceeds {Tolerable_growing_temperature_max}, the plant's growth slows down, the color of its leaves becomes lighter, and it becomes more susceptible to sunburn.

Solutions

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

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Care Guide for Welsh onion

Questions About Welsh onion

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Key Facts About Welsh onion

Attributes of Welsh onion

Symbolism

Scientific Classification of Welsh onion

Common Pests & Diseases About Welsh onion

Distribution of Welsh onion

Habitat of Welsh onion

Distribution Map of Welsh onion

More Info on Welsh Onion Growth and Care

Plants Related to Welsh onion

Care Guide for Welsh onion

Questions About Welsh onion

More Questions People Also Ask

Key Facts About Welsh onion

Attributes of Welsh onion

Symbolism

Scientific Classification of Welsh onion

Common Pests & Diseases About Welsh onion

Distribution of Welsh onion

Habitat of Welsh onion

Distribution Map of Welsh onion

More Info on Welsh Onion Growth and Care

Plants Related to Welsh onion