1. Planting density: The planting time of crape myrtle should be from after the leaves fall in autumn to before the buds sprout in spring. Small seedlings can be transplanted with bare roots, while large seedlings need to be transplanted with soil balls; for planting, fertile, calcareous soil and well-drained sandy loam should be selected, the soil should be prepared carefully, and sufficient base fertilizer should be applied. The short-term planting distance should be 0.65*1 meter, that is, 1,000 per mu. Plants can be planted in the mid-term with a plant-row spacing of 1.6X2 meters and 200 plants per acre. It is best to transplant seedlings during the dormant period. After the transplantation is completed, water the roots in a timely manner, and do a good job of clearing the ditch and cultivating the soil. Daily management mainly includes soil loosening, weeding, watering and fertilizing, and pest and disease control. 2. Water and fertilizer management: The soil should always be kept moist throughout the growing season, and water should be poured once every 10 days during the spring drought. It is not advisable to water too much during the flowering period in autumn, usually once every 15 days. In winter, sufficient antifreeze water should be poured. Fertilizing crape myrtle is usually done in winter or early spring; each plant can be fertilized with 10 to 15 kg of decomposed human excrement or 2 to 4 kg of organic fertilizer, and a small amount of inorganic fertilizer from May to June. Nitrogen fertilizer and compound fertilizer should be applied during the growing season of seedlings to accelerate the growth of seedlings. In the first three years after planting, 10 to 15 kilograms of fertilizer (mainly organic fertilizers such as compost and cake fertilizer) should be applied to the roots in winter or spring before germination. You can also apply certain compound fertilizers as appropriate. After survival, the crape myrtle should be watered with green water once every spring, 3 to 4 times thereafter, and 1 to 2 times during the flowering period. In North China, pour freezing water once before freezing, and pay attention to drainage after rain. 3. Soil Management: Pay attention to weather changes in summer and autumn, and do timely work to prevent drought, drain water and reduce soil erosion. 4. Plastic pruning The plastic pruning of crape myrtle is mainly during the dormant season, supplemented by the growing season. Different pruning methods are adopted according to different garden environments. 1. Natural open shape. After the crape myrtle is planted, when the crape myrtle grows to a fixed pole height, perform pruning to promote secondary branches. Finally, you can choose to leave 3 to 5 strong branches as the main branches. In the future, select branches with different angles and balanced growth on the main branches. 1 to 2 branches serve as side branches. When pruning every year, the upper branches with larger angles should be selected as extension branches and shortened appropriately. This kind of tree shape has good permeability and can bloom three-dimensionally. 2. The main trunk is layered. This kind of tree shape requires an obvious main trunk and main branches. The main trunk is layered and the main branches are evenly distributed on the main trunk. Generally there are about 4 main branches, and about 2 side branches are left on the main branch. This tree shape is suitable for garden cultivation and solitary tree planting. 3. Control pruning during flowering period. To make the crape myrtle bloom in full bloom during the National Day, you can shorten the new shoots of the crape myrtle that are in full bloom in early August and cut off about 1/3 of the top branches and leaves of all the flower branches. After that, strengthen water and fertilizer management and fertilize 2 to 3 times. Flower buds can form on the new shoots again in about 30 days. Generally, it can bloom again in about 50 days from the date of pruning, adding a festive atmosphere to the festival. 5. Prevention and control of pests and diseases: The main ones include aphids, crape myrtle and velvet scales, large damson moths and sooty stains caused by insect pests, which should be prevented and controlled in time. 1. For aphids, you can spray 1.2% bitter smoke emulsifiable concentrate 800 to 1000 times liquid, or 50% pirimicarb 3000 times liquid, or 2.5% methacrylate 2500 to 3000 times liquid, or 6% imidacloprid 3000 to 4000 times liquid. Use one of the following methods to spray the leaves, please pay attention to safety when spraying. 2. For Lagerstroemia velvet scales, within 7 days after the nymphs hatch, when wax has not formed or has just begun to form a wax layer, spray 40% instant scale-killing emulsifiable concentrate 1500 to 2000 times liquid and 6% imidacloprid soluble liquid on the branches and leaves. 2000 times solution, 2500 times solution of pyrethroid pesticides. The above three agents are used alternately, sprayed every 7 to 10 days, and sprayed 2 to 3 times continuously to achieve good results. The key to spraying is to seize the opportunity (nymph stage) once the shell is formed, spraying will be difficult to be effective. 3. For the giant moth, the bags of the bag moth can be seen on the tree after the trees fall in winter, and they must be removed manually; use frequency vibration insecticidal lamps to trap and kill the adults; the larvae of the moth are more sensitive to trichlorfon pesticides, so use 90% trichlorfon. A 1000- to 1500-fold solution of Centrocrystal can achieve better results. You can also use 2.5% deltamethrin EC 3500 to 4000 times, or 50% phoxim EC 1000 to 1500 times, 20% chrysanthemum EC 1000 to 1500 times, etc., and strive to spray evenly and thoughtfully 4. For sooty stains , mainly caused by the secretions of sucking pests such as aphids and scale insects. It is key to prevent and control it. You can also spray it with 500 times carbendazim liquid.