How does crape myrtle promote flowers?

Technical measures for flower promotion

Lagerstroemia indica +0. 1 points for attention in cultivation techniques

Planting Lagerstroemia indica before germination, laying pole support, and watering the root water for the first time. There is plenty of rain in Hubei in March and April, so pay attention to high planting and no water accumulation.

1.2 timely pruning

After Lagerstroemia indica blooms, the residual flowers must be cut off in time, and it is forbidden to arrange pruning after the flowers are completely withered. When most of the flowers on the branches begin to wither, the residual flowers need to be cut off. After pruning, the flowers on the other branch are in full bloom, which can ensure that the flowers keep blooming every day. At the same time, when cutting off two branches, one branch needs to be kept and the other branch must be cut off, otherwise it will be difficult to blossom in turn, let alone the whole tree can bloom continuously.

Do a good job in maintenance management.

2. 1 scientific watering

Osmanthus fragrans is afraid of waterlogging and likes humidity, so it is necessary to water it properly to avoid excessive watering, which can effectively avoid water accumulation, and Lagerstroemia indica will not die because of rotten roots. However, if the water supply is not timely, it will also lead to the suspension of growth due to lack of water, and in severe cases, it will cause local dryness and even death. Especially in the flowering period, the soil must always be moist and not too dry. The high temperature season in summer and autumn is the flowering period of Lagerstroemia indica. At this time, strong light and long sunshine time can increase the evaporation rate of water, so it is necessary to replenish water in time. Once it is found that the buds are drooping and the leaves are slightly curled, it is necessary to water them in time, according to certain principles, that is, dry and wet, not watering, and pouring thoroughly. If the temperature is between 38-40℃, water it every morning and evening, and spray water on the trunk and branches for maintenance.

2.2 timely fertilization

The key to ensure the growth of Lagerstroemia speciosa is to do a good job of topdressing, and it is also the key to the beauty and abundance of Lagerstroemia speciosa leaves when viewing them. The newly planted Lagerstroemia indica has very limited nutrients, so it needs to be supplemented with fertilizer in time, which can be decomposed human and animal manure or cake fertilizer, supplemented by chemical fertilizer.

On the one hand, base fertilizer should be applied adequately and NPK fertilizer should be used reasonably. On the other hand, in order to increase the application amount of topdressing, it is necessary to apply liquid fertilizer 1 time for 5-20 days during the growth period of Lagerstroemia indica.

After pruning or picking leaves, 0.2% urea solution should be added to the fertilizer solution, which can create good conditions for new buds to germinate and grow new branches. It is necessary to increase the number of fertilization in full bloom and strictly follow the principle of applying thin fertilizer frequently. In addition, do a good job of fertilization outside. 0.0 1% urea solution needs to be sprayed 1 time for each germination, that is, it needs to be sprayed with 0.02% potassium dihydrogen phosphate solution 1 time before flowering.

2.3 Actively prevent and control pests and diseases

Pay attention to pests and diseases in maintenance. Aphids like to eat leaves. Check and spray imidacloprid or omethoate in time. There may be borers. Inject a bug eye with a syringe to kill the pests in the trunk.

On the one hand, do a good job in disease prevention and control. Spraying Pomei 0.3~0.5 degree sulfur mixture can effectively control sooty blotch, 70% thiophanate-methyl 700~800 times liquid irrigation can control root rot, and spraying sulfur powder can control powdery mildew. The above chemicals need to be sprayed once every 5-7d and continuously for 2-3 times.

On the other hand, do a good job of pest control. Scale insects can be sprayed with 40 dimethoate EC 1000 times solution or 6% ~7% vinegar. 50~60 times of tobacco lime water solution or 7% ~8% washing powder solution can be sprayed to kill aphids and pink aphids, of which the latter will not pollute the environment; 90% trichlorfon crystal 1000 times solution or 25% carbaryl wettable powder was used to spray kill giant salamander.

2.4 Cold and Winter

In order to help Lagerstroemia speciosa spend the whole cold winter safely, the roots and stems of Lagerstroemia speciosa can all be covered with tree hole soil.

2.5 loosen the soil

By loosening the soil, Lagerstroemia indica can increase the air permeability in the soil and help the roots grow better.

Concluding remarks

To sum up, in order to increase the flowering times, dates and quantity of Lagerstroemia indica, it is necessary to master certain techniques and explore in detail how to do a good job in maintenance and management, so as to help Lagerstroemia indica bloom many times.