How to apply fertilizer to the yellow leaves of Lagerstroemia and how to solve them

Crape myrtle, hearing this name makes people think of crape myrtle in "returning pearls". In fact, there is no connection between them. Crape myrtle is a kind of flower plant with high ornamental value. Crape myrtle flower has a long flowering period, beautiful and gorgeous flowers, it is easy to attract eyeballs. But if you want to raise such a beautiful plant, you still need to master the breeding skills.

How to fertilize crape myrtle

1. Fertilize according to the growth condition

Every year after winter, crape myrtle flowers will lose their leaves. After falling leaves, we can apply some organic fertilizers, such as sesame sauce dregs and animal dung and urine, which are good organic fertilizers. Similarly, the same organic fertilizer can be used before the new buds of crape myrtle flowers grow in spring. This can make crape myrtle flowers grow vigorously and make their flowers big and colorful.

2. Changing fertilization according to the season

When the crape myrtle flower is sprouting in early March, it is necessary to apply a mixed fertilizer of nitrogen, phosphorus and potassium to help the branches and leaves grow. Mixed phosphorus and potassium fertilizer should be applied in late May and early June, which can make crape myrtle blossom and strengthen the flower branches. Generally speaking, the flowering period of crape myrtle is from July to September. At this time, some cake fat and water can be used as flowering fertilizer, which can make the flowers of crape myrtle more colorful.

Causes of yellowing of leaves of crape myrtle and its solutions

1. Life aging

The first reason for the yellowing of crape myrtle leaves is that the plant is undergoing normal metabolism. During this process, the leaves of the plant itself will gradually turn yellow and fall off due to the natural consumption of nutrients, which is a normal phenomenon in the growth process of crape myrtle.

Solution: there is no need to worry about this situation, continue to do a good job in the normal and reasonable maintenance and management of crape myrtle can be safely spent.

2. Overwatering

Crape myrtle has strong drought resistance, and the soil moisture caused by excess water, together with the effect of stagnant water, makes it difficult for the roots to absorb enough oxygen and weaken, so that nutrients can not be transferred to the leaves, resulting in yellow flowers in the leaves.

Solution: the watering principle of "no dry, no watering" needs to be adhered to all the time, especially in the rainy season, effective drainage measures should be taken to avoid rotting roots.

3. Powdery mildew

Powdery mildew is a disease that most plants suffer from in their growth, and crape myrtle is also an important infection object. The leaves of crape myrtle damaged by powdery mildew will gradually wither and yellow, and eventually fall off one after another, seriously affecting the growth of the plant and the normal ornamental effect of crape myrtle.

The solution: first of all, the daily maintenance work should be done well, the healthy growth state can improve the disease resistance of the plant, and to prevent the disease in the growing period, we can spray 80% concentration of Dysen zinc wettable powder solution, 70% concentration of methyl thiophanate 1000-fold solution, 20% concentration of triadimefon EC 1500-fold solution and 50% concentration of carbendazim wettable powder solution.

How to prune crape myrtle correctly

1. Spring

Spring pre-bud and post-bud two ways, pre-bud pruning should be carried out before crape myrtle grows new branches, so that it will not disrupt its growth function. Crape myrtle grows faster and sprouts faster. In spring, the branches will grow leaf buds everywhere, thus destroying the appearance of the plant and growing in a mess. At this time, pruning can be done by pruning after the bud.

2. Winter

In winter, crape myrtle will enter dormancy, then pruned after the dormancy period, which can ensure the shape of crape myrtle. In the process of crape myrtle pruning, the branches should be pruned in a more hierarchical way, which can prevent the seedlings from crossing each other and look more hierarchical, while ensuring a small amount of buds on the trunk.

3. Summer and autumn

The purpose of pruning in summer and autumn is to make the flowering period of crape myrtle become long, pruning the recently growing branches so that there are only a small number of buds on the branches, which can promote the re-growth of new branches and ensure its beauty. This method of pruning is called bud pruning.

Modeling method of crape myrtle bonsai

When modeling the bonsai of crape myrtle, the trunk of crape myrtle is mostly thickened by multi-stem twisting method. The method is that the branches growing in the root are wound along the trunk and fixed with a rope. After 2 or 3 years of growth, the finger sleeve and the trunk can grow together to achieve the effect of thickening the trunk.

In addition, you can also plant several seedlings of crape myrtle together, wrap them around each other when they grow, and fix them with a rope, which will also achieve the desired effect. The side branches of crape myrtle can be pruned to shape.

Home culture of crape myrtle will be subject to many restrictions, so maintenance is relatively complex. But crape myrtle has a very strong ability to adapt to the environment, so flower friends do not need to worry too much, as long as it is based on its growth habits, combined with their own environment, I believe that the growth will not be bad!