The Crepe myrtle generally needs about a gallon of water each schedule,With the potted plants, you might want to water them deeply until you see that the water is dripping at the bottom of the pot. Then, wait for the soil to dry before watering them again. You can use a water calculator or a moisture meter to determine the amount you've given to your plant in a week. Provide plenty of water, especially in the flowering period, but let the moisture evaporate afterwards to prevent root rot.

If Crepe myrtle is planted outdoor with adequate rainfall, it may not need additional watering. When Crepe myrtle is young or newly planted, make sure it gets 1-2 inches of rain per week. As Crepe myrtle continues to grow, it can survive entirely on rainfall. Only when the weather is too hot, or when there is no rainfall at all for 2-3 weeks, then consider giving Crepe myrtle a full watering during the cooler moment of the day to prevent the plant from suffering from high heat damage. Additional watering will be required during persistent dry spells.

The Crepe myrtle likes deep and infrequent watering. You would want to soak them in a gallon of water each time, especially when they are planted in pots. The water storage of flower pots is limited and the soil will dry out faster. Watering is required every 3 to 5 days when living in a cold region. Water it early in the morning when the soil is dry, outdoors or indoors. You can also determine if watering is needed by checking the soil inside. When the top 2-3 inches of soil is dry, it is time to give the plant a full watering. During hot days, you may need to check the moisture daily, as the heat can quickly dry out the soil in the pot.
Irrigation of the soil is also required if you have a garden. When you live in a hot climate, you might want to water once a week. Only water when you notice that about 2 to 3 inches of soil become too dry outdoors or indoors. Consider the amount of rainwater on the plant and ensure not to add to it to prevent root rot.You may not need additional watering of the plants if there is a lot of rainfall.Crepe myrtle generally grows during spring and fall. When they are outdoors, you need to add mulch about 3 to 4 inches deep to conserve more water.

You need to water the plants more frequently in sandy soil because this type tends to drain faster. However, with the clay one, you need to water this less frequently where you could go for 2-3 days to dry the plant and not develop any root rot. You could mark the date on the calendar whenever you water and when you notice that the leaves are starting to droop. This can mean that you might be a day late.

The Crepe myrtle needs outdoors come from rain, with only persistent dry weather requiring watering. Throughout the spring and fall growing seasons, the soil needs to be kept moist but not soggy, and alternating dry and moist soil conditions will allow the Crepe myrtle to grow well. Throughout the summer, hot weather can cause water to evaporate too quickly, and if there is a lack of rainfall, you will need to water more frequently and extra to keep it moist.

Usually, the Crepe myrtle will need less water during the winter. Since the Crepe myrtle will drop their leaves and go dormant, you can put them into a well-draining but moisture-retentive soil mixture like the terracotta to help the water evaporate quicker. Once your Crepe myrtle growing outdoors begins to leaf out and go dormant, you can skip watering altogether and in most cases Crepe myrtle can rely on the fall and winter rains to survive the entire dormant period.

After the spring, you can cultivate your Crepe myrtle and encourage it to grow and bloom when the temperature becomes warmer.This plant is not generally a fan of ponding or drought when flowering. You must ensure that the drainage is good at all times, especially during the winter.

When the plant is in a pot, the plant has limited root growth. Keep them well-watered, especially if they are planted in pots during summer. They don't like cold and wet roots, so provide adequate drainage, especially if they are still growing.

It's always best to water your Crepe myrtle’s diligently. Get the entire root system into a deep soak at least once or twice a week, depending on the weather. It's best to avoid shallow sprinkles that reach the leaves since they generally encourage the growth of fungi and don't reach deep into the roots. Don't allow the Crepe myrtle’s to dry out completely in the fall or winter, even if they are already dormancy.

Don't drown the plants because they generally don't like sitting in water for too long. They can die during winter if the soil does not drain well. Also, apply mulch whenever possible to reduce stress, conserve water, and encourage healthy blooms.

If planting in the ground, Crepe myrtle mostly relies on rain. However, if there is no rainfall for 2-3 weeks, you may need to give proper consideration to giving the plants a deep watering. If watering Crepe myrtle in summer, you should try to do it in the morning. A large temperature difference between the water temperature and the root system can stress the roots. You need to avoid watering the bushes when it's too hot outside. Start mulching them during the spring when the ground is not too cold.

The age of the plants matter. Lack of water is one of the most common reasons the newly planted ones fail to grow. After they are established, you need to ease off the watering schedule.

Reduce watering them during the fall and winter, especially if they have a water-retaining material in the soil. The dry winds in winter can dry them out, and the newly planted ones can be at risk of drought during windy winter, summer, and fall. Windy seasons mean that there's more watering required. The ones planted in the pot tend to dry out faster, so they need more watering. Once you see that they bloom less, the leaves begin to dry up.

Potted plants are relatively complex to water and fluctuate in frequency. Always be careful that the pot-planted plant don't sit in the water. Avoid putting them in containers with saucers, bowls, and trays. Too much watering in the fall can make the foliage look mottled or yellowish. It's always a good idea to prevent overwatering them regardless of the current climate or season that you might have. During the months when Crepe myrtle begins to flower, you might want to increase the watering frequency but give it a rest once they are fully grown.

Give them an adequate amount of water once every 3 to 5 days but don't give them regular schedules. Make sure the soil is dry by sticking your finger in the pot, or use a moisture meter if you're unsure if it's the right time. Too much root rot can cause them to die, so be careful not to overwater or underwater regardless of the climate or season you have in your area.

An overwatered Crepe myrtle can start to have leaves that turn yellow, drop off and wilt. The plant can also look dull and unhealthy, with signs of mushy stems. When they are beginning to show these signs, it's best to adjust your schedule whenever possible.
The wilting can also be a sign of under watering as well. You might see that the leaves begin to turn crispy and dry while the overwatered ones will have soft wilted leaves. Check the soil when it is dry and watering is not enough, give it a full watering in time. Enough water will make the Crepe myrtle recover again, but the plant will still appear dry and yellow leaves after a few days due to the damaged root system. Once it return to normal, the leave yellowing will stop .

Always check the moisture levels at the pot when you have the Crepe myrtle indoors. Avoid overwatering indoors and see if there are signs of black spots. If these are present, let the soil dry in the pot by giving it a few days of rest from watering.

Overwatering can lead to root rot being present in your plant. If this is the case, you might want to transfer them into a different pot, especially if you see discolored and slimy roots. Always prevent root rot as much as possible, and don't let the soil become too soggy.

You should dig a little deeper when you plant your Crepe myrtle outdoors. When you check with your fingers and notice that the soil is too dry, it could mean underwatering. Adequate watering is required to help the plant recover.

You might want to put a garden hose at the plant base to ensure that you're promoting excellent root development. Avoid directly spraying the leaves, and know that the leaves will require more watering if they are outdoors and facing direct sunlight. You can also use bubblers that you can put on to each plant to moisten the roots. Also, use soaker hoses that can cover the entire garden or bed when adding or removing plants to push the roots deeply. Drain any excess water and wait for the soil to dry before watering. Water at ground level to prevent diseases. On a sunny day, you might want to spray the entire bush with water. Whether potted or in-ground, please remember Crepe myrtle prefers deep watering over light sprinkling.

Watering the Crepe myrtle helps transport the needed nutrients from the soil to the rest of the plant. The moisture will keep this species healthy if you know how much water to give. The watering requirements will depend on the weather in your area and the plant's soil.

The Crepe myrtle thrives on moist soil, but they can't generally tolerate waterlogging. Ensure to provide enough mulch when planted on the ground and never fall into the trap of watering too little. They enjoy a full can of watering where the water should be moist at the base when they are planted in a pot to get the best blooms.

If they are grown as foliage, you need to water them up to a depth of 10 to 20 inches so they will continue to grow. If it's raining, refrain from watering and let them get the nutrients they need from the rainwater.

One of the most common issues with Crepe myrtle is overgrowth. Once they get unruly, it can be tricky to get them to look their best again. In some situations, it may be best to cut away everything except for secondary branches- those that grow from the main stem or trunk- and henceforth only trim back new branches liberally until your Crepe myrtle regains its shape.

While one could technically let your Crepe myrtle go without pruning, the form and health of the tree may suffer, and will end up looking quite shaggy and unorganized. Crepe myrtle is grown for its attractive flowers. While not strictly necessary, many people prefer to prune this plant every year or two to encourage flowering and to maintain an attractive appearance so that your Crepe myrtle can keep in great shape. Pruning not only helps the tree relieve itself of burdens like dead wood and disease, but it also gives you the creative ability to style the tree in a way that works for you!

Pruning the Crepe myrtle should be saved until the tree is mature, or has at least one thick stem or trunk that other, smaller branches grow from. That being said, you can train younger Crepe myrtle to grow in a style that you like by snipping off new growths at the base of the tree where it meets the ground. Here’s a general idea of how to get started pruning your Crepe myrtle.

Tools
For pruning, you’ll of course need some sort of clippers. Loppers are best for thicker branches, while hand pruners will usually get the job done on smaller branches that are less than the thickness of your average pencil. You’ll also need a good pair of gloves, as well as some sort of protective eyewear. Pruning can sometimes get a little pokey, so you want to make sure that none of the stray branches or debris end up in your eyes.

How to Prune
To prune the Crepe myrtle, first identify how the tree has grown thus far. It can either look bushy, like a shrub, or it can have one or more trunks that stem up from the ground with foliage in the top quadrant. If you have a bushy Crepe myrtle and you like it that way, then you can simply trim just as you would an average shrub, by removing new growths at equal heights just above a leaf node.

For taller Crepe myrtle, there’s a little more to it. Identify the look you want first. If all you’re looking for is a quick prune and done, then all you really need to do is cut back any growth that is growing towards the inside of the canopy, as well as any “suckers”, or stems that grow below the canopy line. In this case, it is necessary to prune in winter, giving priority to the reduction of dead and dry branches. Afterwards, the crossed and parallel branches are pruned off, which increases the space for other branches to grow. In this case, it is necessary to prune in winter, giving priority to the reduction of dead and dry branches. Afterwards, the crossed and parallel branches are pruned off, which will increase the space for other branches to grow.

If what you need is to take off some serious area, then more planning is in line. The Crepe myrtle branch out in a fan fashion from the center trunk, and each branch will have its own branches that grow from them, as well. Try to take off branches that are pointing downward at their bases, but avoid cutting too much away from each secondary branch.

From here, you can do some milder pruning around the areas where you removed branches in order to clean up the look and blend in the newly trimmed sections. Never trim off so much that no secondary branches are left from the main trunk; Crepe myrtle can tolerate this, but it takes years for them to recover fully.

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.

You can take a few extra steps to make sure that your pruning is both successful and healthy. As with most woody, flowering trees, Crepe myrtle should be spoiled with a little extra water over the following week so that it has the means to heal its wounds. Crepe myrtle is a tough cookie, so it can take care of itself for the most part after the annual snipping.

You can also fertilize just before or after pruning, which gives Crepe myrtle a little vitamin boost that can provide it the nutrients needed to better protect itself from any nearby pathogens or diseases. If you have other plants or trees nearby that are affected by diseases such as fungi or pests, you can also apply honey to the wounds just after pruning to create a sort of natural bandage.

There are ultimately two times of the year that work best for pruning Crepe myrtle. Although it can be pruned at any time in cases of emergency, such as a broken branch, pruning should be left to the seasons where Crepe myrtle isn’t actively blooming or putting on new growth. This is a very typical pruning rule for most woody plants.

Pruning can either take place just before the tree begins to put on new growth in very early Spring, or it can wait until just after all the blooms have fallen and your Crepe myrtle is starting to fall into dormancy. The best time to prune is just before new growth appears, but either time is great for removing extra growth.Use garden shears to cut off broken, dead, weak or diseased branches from Crepe myrtle. Observe the branch to see if it is dry and brittle. You can also tell if a dead branch is present by its color. If the branch is dark green, it is weak and dying; if the branch is brown, then the branch is already a dead branch.

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.

Keeping the soil temperature consistent is one of the most important strategies to keep Crepe myrtle healthy, which leads to successful budding, flowering, and new growth. Do this by consistently watering, adding mulch to bare soil, and planting in the shade.

Crepe myrtle can withstand freezing temperatures when planted in the ground in areas that don’t get below of 5℉(-15℃) as an extreme temperature during the winter months. But if planted in pots or containers, then their roots must be protected from the winter cold. Do this by wrapping the container in a blanket or bringing it inside where it will be fully protected from the elements.

Due to the cold tolerance of Crepe myrtle, heating pads will not be necessary if planted outside in the ground. If the plant is in an outdoor pot, then bring it to a heated house and place it in a sunny window during the winter months.

To ensure adequate temperature conditions are present, plant Crepe myrtle in an area with partial shade. If possible, use afternoon shade to provide the best protection during the hottest part of the day. This will also result in lower temperatures in the soil due to increased moisture retention. If Crepe myrtle is planted indoors, then keep the container away from windows and out of direct sunlight during the summer months to prevent the soil temperature from spiking daily.

During the summer or times of high heat, give Crepe myrtle extra shade and water to help cool its leaves, roots, and soil. During cold snaps or growing season freezes, cover sensitive budding vegetation with frost cloth or water using sprinkler systems. If it’s only nearing freezing temperatures for a short period, then water during the day several hours before the freeze. If the temperature is predicted to remain below freezing for an extended period, then keep the sprinkler running until the temperature rises above freezing the following day.

Crepe myrtle is a mid-temperature plant that can easily tolerate the typical fluctuations of the seasons and remain a hardy species when planted in maintained landscapes areas, containers, or indoors. Therefore, adjusting the temperature during the different seasons is unnecessary for primary growth. If flowering is stunted or impeded, then allowing the plant to experience a season of winter freeze could help to revive flowering.

Research shows that Crepe myrtle will begin to exhibit signs of stunted growth during prolonged periods of higher temperatures, especially during the development of axillary buds and the growth of main shoots. Keeping the temperatures consistent and cooler, around 65℉(18℃), will encourage vigorous growth after germination or transplanting.

If it becomes too difficult to lower the temperature for an indoor plant during the summer, then plant it outside in the ground or in a container. Make sure to plant Crepe myrtle in a shaded location and water often to keep the soil moist.

Greater harm will come to Crepe myrtle if the temperature is consistently too high versus too low.
If Crepe myrtle gets too hot, seed germination and photosynthesis efficiency is lessened due to hormone triggers caused by heat stress. The plant will show signs through wilting, leaf browning, and potentially death.
If Crepe myrtle gets too cold, plant functions such as nutrient uptake and photosynthesis will cease, resulting in the possible death of the plant. If a single freezing event occurs during the growing season, then a membrane phase transition might occur, which can cause a cease in plant functions and death of the plant.

The best temperature for Crepe myrtle to thrive is 65~80℉(18~27℃). During the primary growing phase, the highest temperature tolerable would be 90℉(33℃), while the lowest tolerable temperature would be -5℉(-20℃). This species is tolerant of low temperatures and will survive freezing winters. The perfect, highest, and lowest temperature range:
Perfect：65~80℉(18~27℃)
Highest：85~90℉(30~33℃)
Lowest：-5~5℉(-20~-15℃) or below

Crepe myrtle and other temperate flowering trees, vines, and shrubs often benefit from early spring care.

Tip 1: Spring care includes pruning to remove dead branches. Be careful not to cut away any buds, it will reduce flowering.

Tip 2: Apply a balanced, all-purpose fertilizer to support healthy growth.

Tip 3: Pay attention to soil moisture levels, and water whenever the top layer of soil is beginning to dry out.

Tip 4: Ensure container plants are receiving enough sunlight. Move the plants to a location receiving around six hours of sunlight a day.

Temperate flowering trees, vines, and shrubs like Crepe myrtle require more care in the summer.

Tip 1: Frequent watering in the summer is a must in most climates, especially in the south. Check the soil’s moisture levels daily, watering when it is beginning to dry out.

Tip 2: Stop fertilizing in the summer while the plant is not in bloom.

Tip 3: summer is the ideal time to remove any spent blooms to encourage re-flowering in the fall.

Tip 4: Move container plants out of the bright sunlight.

Tip 5: Keep an eye out for pests and diseases. Removing plant debris from the area can help with any potential issues.

Your Crepe myrtle needs a bit of care in the autumn months to keep it looking its best and prepare it for winter.

Tip 1: In the late fall, you can give your Crepe myrtle a good prune. Remove any low-hanging or overcrowding branches, along with energy-sapping suckers, to keep the plant growing strong throughout the season.

Tip 2: Clean up any fallen leaves around the plant, as these leaves can cause harmful bacteria to grow around the plant.

Tip 3: Provide it with enough water to keep the soil moist, watering whenever the soil becomes dry.

Tip 4: Make sure it's exposed to strong sunlight and has some shade in the afternoon.

Tip 5: Watch out for any pests and diseases, such as mildew that looks like a powdery coating on the plant.

Crepe myrtle requires some careful care during the winter.

Tip 1: It's important for your Crepe myrtle to be exposed to cold winter weather during this season, which will help boost its production in the spring, in a process sometimes called “chilling” your plant. Therefore, don't worry about keeping these plants warm or bringing them inside.

Tip 2: You may want to take this dormant time to prune away overcrowding, dead, or diseased parts, however.

All this preparation over the winter can help your plant be its best during the new growth season when the weather warms up in spring.