How to prune Lagerstroemia indica

Lagerstroemia indica generally has strong adaptability to environmental conditions. Resistant to drought and cold. The requirements for soil are not strict, but it grows strongly in fertile, deep, loose and slightly acidic soil, with long flowering period and no fear of waterlogging. It is forbidden to plant in low-humidity places with high groundwater level. It needs sufficient sunshine to grow and blossom, and it is also slightly shade-tolerant, and it grows vigorously in warm and humid climate conditions.

Lagerstroemia indica was planted from June 5438+065438+ 10 to March of the following year. Potting plants with live seedlings from old branches is a good way to cultivate bonsai quickly. Because the branches of Lagerstroemia indica are soft, potted Lagerstroemia indica can be properly climbed and bound. Generally, when the spring shoots stop growing and the branches tend to be semi-lignified, they are coiled and shaped, and pulled by thin brown ropes to make various postures.

Generally speaking, Lagerstroemia indica management is extensive in fertilization. In early March, spraying fertilizer was applied, and N, P and K were applied in combination: from late May to early June, P and K fertilizer 1 time was applied to strengthen branches and promote flowers, and flowering fertilizer 1 time was applied in late July and early September respectively, and the fertilizers were cake fertilizer and water. Only in this way can the flowers bloom brilliantly. If diseases are found, use Bordeaux solution or 600 times carbendazim solution to prevent them.

Lagerstroemia indica grows at the top of the spring shoots that germinated that year, with strong germination ability and irregular crown, which needs pruning.

Pruning after flowering

After flowering in summer, some residual flowers should be cut off to prevent them from bearing seeds, so as to reduce nutrient loss and promote the germination and flowering of new branches. Pruning in the growing period is not suitable for pruning or shortening the new branches sprouting in spring, otherwise it will easily lead to only long branches without flowering. The above are the technical data of cultivation management.

Winter pruning

In order to ensure normal flowering and form large inflorescences, pruning in winter is very important. When planting on the ground, the branches of the current year should be cut off at the fixed height of the main branch, so that the robust branches can blossom in the next year. For potted plants, all sprouted branches, diseased branches and overlapping branches should be cut off first. In order to beautify the shape, the full terminal buds of other branches should be cut off at the top of 1 cm, generally leaving only about 5 cm.

When will crape myrtle be pruned?

winter

How to prune Lagerstroemia indica

Pruning and shaping of Lagerstroemia indica are usually carried out in winter. When pruning, the branches are evenly distributed and the crown is complete. Cut off the stems with sprouting branches and unsuitable parts, and shorten the clustered branches by 2/3. Generally speaking, the branches remain about 6 cm that were cut last winter. In spring, when the new branches grow to about 15cm, the core is removed and the lower part remains about 10cm to promote the growth of the top branched branches. When the forked branches grow to about 20cm, the core is removed again, and the lower part is about 15cm, so as to promote the germination of new branches, and all other branches that affect the appreciation and modeling are removed. After the pruned branches grow out of order, the weaker flower branches and buds irrelevant to the shape are cut off. After the flowers bloom, cut off the residual flowers. If trimmed properly, these flowers can bloom around the National Day.

How to prune Lagerstroemia indica

I don't fully understand what you mean by crape myrtle modeling. According to my current understanding of Wei Zi's modeling, no matter bonsai, the method is nothing more than changing the modeling and direction with soft branches from Wei Zi. You can use this feature to make it into a shape (many seedlings of a certain height), provided that you are ready to realize the final shape model. Here are some pictures I collected online for your reference.

When to Prune Lagerstroemia speciosa Pruning Techniques of Flowering Lagerstroemia speciosa

1. Transplant after defoliation in autumn and before germination in spring. Small seedlings can be transplanted with bare roots, and big seedlings need soil balls to transplant. When planting, compost should be applied and irrigated twice to make it permeable, and then timely irrigation, loosening soil and weeding should be carried out. Lagerstroemia indica can be planted in spring with bare roots. Keep the root system intact when planting seedlings. 2. Planting place The planting place should be sunny, moist and fertile loam with good drainage. 3. Water and fertilizer management Apply sufficient base fertilizer before planting. Fertilizers can be decomposed human excrement, manure, manure and compost. In the first three years after planting, 65,438+00 ~ 65,438+05 kg (mainly organic fertilizers such as compost and cake fertilizer) should be applied to the roots every winter or spring before germination, and some compound fertilizers can also be applied as appropriate. The surviving Lagerstroemia indica is watered 1 time every spring, 3 ~ 4 times later and 1 ~ 2 times in flowering period. In North China, water with frozen water once before freezing, and pay attention to drainage after rain. 4. Pruning planted crape myrtle should pay attention to pruning. When planting larger Lagerstroemia indica, it should be pruned again before planting, and the trunk with uniform height can be set according to the cultivation needs, and all the upper crowns will be cut off to make the newly grown crowns grow vigorously and neatly. During the growth of young Lagerstroemia indica, the lateral buds at the lower part of the stem should be pulled out at any time, so that the terminal buds and upper branches can get more nutrition, grow healthily and form a complete crown as soon as possible. During the growing season, the residual flowers and branches should be cut off in time to promote the development of new branches to prolong the flowering period, and the crape myrtle inflorescence opens at the top of the new branches. Prune long branches, twigs, diseased branches and dead branches after defoliation. Pests and diseases mainly include aphids, crape myrtle, giant salamander, and sooty blotch induced by insect pests, which should be prevented in time. Spray 800 ~ 1000 times 1.2% Kuyan EC, 3000 times 50% pirimicarb, 2500 ~ 3000 times 2.5% triadimefon, or 3000 ~ 4000 times 6% imidacloprid on aphids. Be safe when spraying. For Lagerstroemia indica, when no wax is formed or a wax layer is just formed within 7 days after the hatching period of nymphs, the branches and leaves are sprayed with 1500-2000 times of 40% quick-killing emulsifiable concentrate, 2000 times of 6% imidacloprid soluble concentrate and 2500 times of pyrethroid pesticides. The above three chemicals are used alternately and sprayed once every 7 ~ 10 day for 2 ~ 3 times in a row, which can achieve good results. The key to spraying is to seize the opportunity (nymph stage), once the shell is formed, spraying is difficult to be effective. For the giant salamander, the pouch of the marsupial moth on the tree can be seen after defoliation in winter, which is artificially removed; Trapping and killing adults with frequency vibration insecticidal lamp; Moth larvae are sensitive to trichlorfon, and good results can be achieved by using 90% trichlorfon crystal 1000 to 1500 times. You can also use 3,500 ~ 4,000 times of 2.5% deltamethrin EC, or 1 0,000 ~ 1 0,500 times of 50% phoxim EC and10,500 times of 20% pyrethroid EC to spray evenly and thoughtfully. For sooty blotch, it is mainly caused by the secretion of sucking pests such as aphids and scale insects, which is the key to control.

How to make crape myrtle grow faster

How does Ziwei grow well in Shanghai? External cause: 1, water. Lagerstroemia indica can be transplanted all year round, and the water supply of newly transplanted trees is the most important. The normally growing Lagerstroemia indica trees need water but can tolerate drought, so water management can ensure that the soil does not accumulate water and replenish water before germination and when the soil is dry in midsummer. When there is enough water in the early stage of growth, the leaves are large and full. 2, fat. (1) base fertilizer, with decomposed organic fertilizer and phosphorus and potassium fertilizer when transplanting. Phosphate fertilizer has low fluidity, long application duration as base fertilizer and high utilization rate. (2) topdressing. Lagerstroemia indica needs a lot of fertilizer. Every winter, deep ploughing and hole expanding are applied with organic fertilizer year by year, and cake fertilizer is the best. The quantity meets the requirement of ground diameter * 3kg. Preferably medium-boiled-outdoor blisters in Shanghai in winter 10 days. Other optional chicken manure and pig manure, the dosage is 3 times of cake fertilizer (Lagerstroemia indica with a diameter of 5 cm is applied 45 kg per year). Nitrogen, phosphorus and potassium fertilizer are applied in the growing season. At the early stage of growth, liquid fertilizer can be added. 3. gas. We can hardly control the air. Sandy loam is suitable for soil to increase root respiration. Planting should be shallow. Lagerstroemia indica can absorb many harmful gases, but the planting area is mainly fresh air. 4. heat. Lagerstroemia indica likes heat. March 1-May1can be covered with plastic film to increase soil temperature and promote root growth. The lowest temperature in winter is less than MINUS 20 degrees Celsius, so we should do a good job of protection. The low temperature in Shanghai will not reach this limit, and everyone can spend the winter safely. Like other plants, when the temperature difference between day and night is large in spring and autumn, more nutrients are accumulated. 5. Light. Need plenty of light. Lagerstroemia indica is a light-loving plant, which grows well in sunny conditions. It can grow under dark conditions, and it is easy to get sick, with few leaves and flowers. 6, soil, (1) pH, neutral soil is suitable. (2) Organic matter content, the soil organic matter content should be high, reaching 5% near the planting hole. Organic matter provides nutrients for Lagerstroemia indica growth, promotes the formation of soil aggregate structure, enhances fertilizer conservation efficiency and promotes the availability of soil nutrients. It is a regular work to continuously improve the content of soil organic matter in Lagerstroemia indica cultivation and management. The newly applied organic matter has a high annual mineralization rate and needs to be replenished continuously. When the soil quality of new earthwork is poor, chemical fertilizer can be applied to promote the growth of weeds, so as to improve the soil organic matter content. After two or three years of planting, this method can also be used to improve the content of soil organic matter. (3) The soil texture is sandy loam, and Lagerstroemia indica grows vigorously. 7, pests and diseases. (1) Pests, aphids, moths, scale insects and longicorn beetles. (2) Disease, when the growth is poor, the leaf spot defoliation is serious, and the control of powdery mildew on some trees is also very important. (3) Weeds are harmful and vines are not allowed to climb Lagerstroemia indica. 8, pruning, pruning is not recommended. We generally believe that crape myrtle needs pruning now. At that time, like other cherry blossoms and begonia, it could not be pruned. It is uncertain whether cutting off residual flowers after flowering can improve its biological accumulation. 9. Turn the soil, combine fertilization in winter, and turn the fallen leaves into the soil. Increase the organic matter content of soil. Second, the internal cause: 1, Lagerstroemia species. The growth rate of Lagerstroemia indica has a great relationship with varieties, and varieties with large leaves grow better. There are many reports that Cuiwei's growth is weaker than other varieties. 2, tree potential. For a long time, this tree became stronger and stronger. The above is my personal experience, please don't reprint it.

How to shape Lagerstroemia indica

I don't fully understand what you mean by crape myrtle modeling. According to my current understanding of Wei Zi's modeling, no matter bonsai, the method is nothing more than changing the modeling and direction with soft branches from Wei Zi. You can use this feature to make it into a shape (many seedlings of a certain height), provided that you are ready to realize the final shape model. Here are some pictures I collected online for your reference.

Pruning Ziwei video

Pruning crape myrtle is usually done once in winter. When pruning, keep the branches evenly distributed and the crown intact, cut off the branches that are too dense and sprout on the trunk and the branches that are not suitable, cut off two-thirds of the long branches, and generally keep the branches that were cut about 6cm last winter. In spring, when the length of new branches is about 15cm, the core is removed and the lower part is about 10cm.

How long does it take to prune crape myrtle?

Lagerstroemia indica, as a tree species that blooms in summer and autumn and leaves in winter, can be planted before germination or after flowering in spring, and the leaves in winter are also very good, which not only makes the flowers more lush and gorgeous, but also makes the following Lagerstroemia indica more nutritious in the coming year.

Does crape myrtle need pruning all the year round?

The flowers of Lagerstroemia indica were born on the new branches of that year, and they should be cut again every winter to promote the germination of new branches.