Best Crape Myrtle Fertilizer (How to Fertilize Crepe Myrtle)

Crepe myrtle trees are one of the most popular flowering trees, well known for their vibrant colors and hardy nature. But did you know that selecting the best fertilizer is essential for optimal growth and blooming? In this article, we will explore the different types of granular fertilizers and the optimal NPK ratio for crepe myrtle trees.

Key Takeaways:

  • The right fertilizer is essential for the health and growth of crepe myrtle trees.
  • Granular fertilizers are the best option for crepe myrtle trees.
  • The NPK ratio plays a significant role in choosing the best fertilizer for crepe myrtle trees.
  • Choosing organic or slow-release fertilizers can be more environmentally friendly.
  • Fertilizing during the right season and applying it properly is crucial for optimal results.

Understanding Crepe Myrtle Nutritional Needs

Crepe myrtle trees have specific nutritional needs that should be taken into account for optimal growth and flowering. Understanding these needs is crucial for fertilizing at the right time and with the right materials.

New Growth in Late Winter

For new growth, it is best to fertilize crepe myrtle trees in late winter before the plant starts to produce new leaves. Use a granular fertilizer with a balanced NPK ratio to help promote new growth and lush foliage.

Impact of Summer Heat

During the summer heat, the nutrient requirements of the crepe myrtle tree may change. This is particularly true for potassium, which helps to regulate water and nutrient uptake. To ensure your tree gets adequate nutrients during the hot summer months, consider using a fertilizer with a higher potassium content.

Soil pH and Drainage

Soil pH and drainage are also important considerations when it comes to the nutritional needs of crepe myrtle trees. These trees prefer a well-drained soil with a pH between 6.0 and 7.5. When fertilizing, choose a product that is specifically formulated for your soil’s pH level to ensure optimal nutrient absorption.

“Fertilizing your crepe myrtle trees at the right time and with the right materials can make all the difference in their growth and flowering.”

Different Types of Fertilizers for Crepe Myrtles

When it comes to fertilizing crepe myrtles, there are different types of fertilizers available in the market. Choosing the right fertilizer for your crepe myrtle trees is crucial for optimal growth and colorful blooms. In this section, we will discuss some of the types of fertilizers suitable for your crepe myrtle trees.

Slow-Release Fertilizer

A slow-release fertilizer is a granular fertilizer that releases nutrients slowly over time. Slow-release fertilizers are beneficial to crepe myrtle trees, providing steady nourishment throughout the growing season. Applying slow-release fertilizers results in healthier trees that produce more vibrant blooms. The slow-release feature reduces the likelihood of over-fertilization, which can damage roots and lead to stunted growth.

Organic Fertilizer

Organic fertilizers are a great alternative for homeowners looking for an environmentally friendly option. These types of fertilizers are derived from natural materials such as bone meal, composted manure, and fish emulsion. Organic fertilizers provide both macro and micronutrients essential for the growth and development of crepe myrtle trees. They can be mixed into the soil or applied as a top dressing.

Ideal Fertilizer for Crepe Myrtles

The ideal fertilizer for crepe myrtles should provide the right balance of nutrients for the tree to thrive. Typically, this includes a fertilizer with a balanced NPK ratio of 8-8-8 or 12-4-8. The ideal fertilizer should also contain iron, sulfur, zinc, and other trace minerals. Testing the soil pH can provide insight into which nutrients are lacking, allowing homeowners to choose an appropriate fertilizer.

Ideal Fertilizer for Crepe Myrtles

Did You Know? Applying too much fertilizer can harm your crepe myrtle trees. It’s important to read and follow the instructions on the package carefully.

When to Fertilize Crepe Myrtle Trees

Proper fertilization is vital for the healthy growth of crepe myrtle trees and their beautiful blooms. To achieve the best results, it’s essential to fertilize them at the right time. The optimal time for fertilization depends on the season and the growth stage of the tree.

Early spring is an ideal time to fertilize crepe myrtle trees after winter dormancy. During this stage, crepe myrtles start producing new buds, making it an excellent time to provide them with the necessary nutrients to support growth and development.

Late fall is also an excellent time to fertilize crepe myrtles, preparing them for the winter season. Fertilizing during this time encourages the roots to grow, leading to a healthier tree come spring.

Late summer and early fall are crucial times to fertilize crepe myrtle trees, especially if they’re showing signs of stress due to summer heat. Fertilizing during this period helps the tree replenish nutrients lost during the growing season.

Early summer and late spring are also ideal times for fertilization. During these seasons, crepe myrtle trees undergo significant growth and produce new shoots. Fertilizing at this time helps support the formation of new growth and encourages abundant blooms.

Proper Fertilization Techniques for Crepe Myrtles

When fertilizing crepe myrtle trees, it is crucial to apply the fertilizer to new wood. This helps the plant utilize the nutrients and promote healthy growth. Additionally, ensure proper coverage at the base of the plant, as this is where the majority of the feeder roots are located. Fertilizing new plants can be challenging as they do not have well-established root systems. To promote growth, it is essential to provide them with the right nutrients. Finally, to encourage new shoots, make sure to apply the fertilizer during the first growing season.

Here are some tips for properly fertilizing crepe myrtle trees:

  • Fertilize twice a year: For best results, fertilize in early spring and late summer.
  • Use the right amount: Follow the instructions on the fertilizer package to ensure you use the right amount.
  • Water well: After applying fertilizer, water the plant well to ensure the fertilizer reaches the roots.
  • Avoid over-fertilizing: Too much fertilizer can damage the roots and lead to other problems.

Below is a table of the recommended fertilization techniques for Crepe Myrtle trees:

Technique Description
New Wood Apply fertilizer to new wood to promote healthy growth.
Base of the Plant Ensure proper coverage of the fertilizer at the base of the plant.
New Plants Use fertilizer suited for new plants and ensure they get enough nutrients.
New Shoots Fertilize during the first growing season to encourage new shoots.

Dealing with Common Crepe Myrtle Issues

Despite their beauty and resilience, crepe myrtle trees are susceptible to a few common issues that can affect their growth and vibrancy. Powdery mildew, sooty mold, and black spots are among the most frequent problems encountered by crepe myrtle owners. Fortunately, proper fertilization can enhance disease resistance and minimize the risk of these issues.

Powdery mildew is a fungal disease that appears as a white or gray powder on the leaves, stems, and flowers of crepe myrtles. It is caused by a combination of warm temperatures and high humidity. Regular fertilization can promote strong growth and improve the plant’s natural defenses, reducing the likelihood of powdery mildew.

Sooty mold is another fungal disease that is typically caused by the secretion of honeydew by insects such as aphids, mealybugs, and scales infesting crepe myrtle trees. The build-up of honeydew creates a sticky coating on the leaves, which can attract sooty mold spores. Adequate fertilization can promote foliar growth, discouraging aphid infestations and reducing the risk of sooty mold.

Black spots are yet another issue that can affect crepe myrtle trees. They often appear as discolored areas on the leaves and can be caused by a range of fungal infections. Fertilization with a balanced blend of essential nutrients can strengthen the plant’s natural defenses, helping to prevent black spots.

Overall, choosing the right fertilizer and following proper fertilization techniques can help maintain healthy and vibrant crepe myrtle trees while reducing the risk of common diseases.

Additional Care Tips for Crepe Myrtle Trees

Once you’ve selected the best crepe myrtle fertilizer and applied it correctly, there are additional care tips to keep in mind for optimal growth and blooming.

Much Fertilizer: It’s important to use the appropriate amount of fertilizer, but avoid overfertilization. Too much fertilizer can lead to excessive growth, weaker branches, and reduced blooming. Follow the instructions on the package and avoid adding more than recommended.

Little Pruning: Crepe myrtle trees should be pruned sparingly, limiting it to only dead or weak branches. Excessive pruning can lead to reduced blooming and cause a tree’s growth to become weak.

Managing Seed Pods: Many crepe myrtle trees will produce seed pods, which can be removed or allowed to fall naturally. Seed pods can distract from the visual appeal of your tree, but they also provide a food source for birds.

Dwarf Varieties and Small Trees: For those with limited space, dwarf varieties of crepe myrtle trees or small trees are suitable options. One of the most popular dwarf varieties is the lagerstroemia indica, which grows up to 10 feet tall and is ideal for planting in small gardens or as a border.

Lagerstroemia Indica

This image shows the beautiful lagerstroemia indica, one of the most popular dwarf varieties of crepe myrtle trees, standing beside a house.

Best Fertilizers for Specific Crepe Myrtle Varieties

When it comes to fertilizing specific crepe myrtle varieties, it’s crucial to select the right fertilizer that caters to their unique needs. For varieties with red flowers, the best fertilizer is one that contains a higher level of potassium, which encourages blooming and enhances flower color. On the other hand, smaller crepe myrtle plants thrive when bone meal is added to the soil as it promotes healthy growth and development.

To achieve the best results, consider using fertilizers with a higher level of nitrogen for larger crepe myrtle trees that require more nutrients. Additionally, slow-release fertilizers are a great option for those looking for long-lasting results.

For varieties with red flowers, the Pro Trust Products 46-0-0 Nitrogen Fertilizer or the Jobe’s Organics Fruit & Citrus Granular Fertilizer are excellent options for promoting blooming and enhancing flower color. For smaller plants, adding Jobe’s Organics Bone Meal Fertilizer to the soil promotes healthy root development and ensures strong, steady growth.


In conclusion, choosing the best fertilizer for your crepe myrtle trees is crucial for achieving the best results. As earlier highlighted, crepe myrtles require a lot of exposure to full sun, and fertilizing in late summer is the best option to ensure maximum nutrient uptake.

Consider using slow-release or organic fertilizers for better and long-term results. Remember to apply fertilizers in early spring, late fall, late summer, early summer, late spring, and early fall.

Proper fertilization techniques such as applying fertilizer to new wood, the base of the plant, and during the first growing season are significant for maximizing results.

Remember to take care of your crepe myrtle trees by offering adequate care such as minimal pruning, managing seed pods, and selecting the best fertilizer for specific varieties. For instance, smaller crepe myrtle plants may benefit from using bone meal as a fertilizer.

Overall, selecting the best fertilizer for your crepe myrtle trees is essential for optimal growth and a bountiful bloom. Keep in mind the importance of proper fertilization techniques, and you’ll undoubtedly achieve the best results for your crepe myrtles.


What is the best fertilizer for crepe myrtle trees?

The best fertilizer for crepe myrtle trees is a granular fertilizer with a balanced NPK ratio. Look for a fertilizer with an NPK ratio of 10-10-10 or 12-4-8 for best results.

How often should I fertilize my crepe myrtle trees?

It is best to fertilize crepe myrtle trees once a year, in late winter or early spring, before new growth begins. Avoid fertilizing in late fall or winter months, as it may stimulate new growth that can be damaged by cold temperatures.

Can I use organic fertilizers for crepe myrtle trees?

Yes, organic fertilizers can be a good choice for crepe myrtle trees. Look for slow-release organic fertilizers that provide a balanced range of nutrients for healthy growth.

When is the best time to fertilize crepe myrtles?

The best time to fertilize crepe myrtles is in early spring, just before new growth begins. This allows the tree to utilize the nutrients for healthy development. Avoid fertilizing in late summer or fall, as this can stimulate new growth that may be susceptible to damage from winter cold.

How much fertilizer should I use for my crepe myrtle trees?

The amount of fertilizer to use depends on the size of the tree. For young or newly planted crepe myrtles, use about 1/4 to 1/2 cup of granular fertilizer. For larger, more established trees, use 1 to 2 cups. Spread the fertilizer evenly around the base of the plant.

How often should I prune my crepe myrtle trees?

Crepe myrtle trees require little pruning. Prune only to remove dead or damaged branches, or to shape the tree for aesthetic purposes. Avoid heavy pruning, as it can reduce flowering and cause the tree to produce excessive new growth.

How do I deal with powdery mildew on my crepe myrtle trees?

Powdery mildew can be prevented or minimized by providing proper care to your crepe myrtle trees. Ensure they are planted in locations with good air circulation and receive enough sunlight. Pruning can also help with air circulation. If powdery mildew does occur, you can use a fungicide labeled for powdery mildew control.

What are some common issues that crepe myrtle trees may face?

Common issues that crepe myrtle trees may face include powdery mildew, sooty mold (caused by insect infestations), and black spots. Proper fertilization, pruning, and providing appropriate care can help minimize these problems.

Can crepe myrtle trees be grown in acidic soils?

Yes, crepe myrtle trees can tolerate a range of soil pH levels, including slightly acidic soils. However, it is always beneficial to test the soil pH and make amendments if necessary to ensure optimal nutrient availability for the trees.

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