First dormancy pruning: Lagerstroemia indica leaves late, so it should be pruned in February and March when it enters dormancy after defoliation. The best time is about 10 ~ 15 days before spring bud germination. Pruning at this time is beneficial to concentrate the nutrition of trees, promote the germination of spring buds and grow into strong new buds-flower branches; Pruning in the second growth period: it should be carried out from early summer to mid-May before flowering; Third pruning after flowering: it can be done in the young fruit period after the last flowering period. Pruned autumn shoots can germinate and grow for a long time in the same year, which is beneficial to cultivate more flowering and strong mother branches in the next year. But it was pruned too early after the last flowering period. It will promote the mother branch to sprout new autumn shoots and bloom again. If you don't prune after flowering in summer, you can enjoy the fruit in autumn and prune it before it matures.

Second, the red rocket pruning intensity:

Lagerstroemia rubra is resistant to pruning and has strong germination ability. After pruning the annual to perennial branches with different intensities in late winter and early spring, the sprouted spring shoots can bloom in summer. Pruning intensity can be divided into light cutting, medium cutting and heavy cutting for flowering mother branches. Light pruning: cut off the top of 1/3 from 2/3 of the length of the parent branch, and keep the long parent branch. After pruning, many new buds germinate, but the inflorescence is short; Mid-cutting: the mother branch is cut short at the length of 1/2, leaving the medium-long mother branch, and the sprouted new shoots are stronger, the inflorescence is larger and there are many buds; Re-cutting: cut off 2/3 of the length of the mother branch, leaving short mother branches. Most of the sprouted buds can develop into strong flower branches with large order and many flowers. In addition, old trees can prune and renew perennial branches, and new branches can also bloom in the same year.

Three, red rocket crape myrtle pruning method:

Dormancy pruning: first of all, we should pay attention to plastic pruning, that is, cut off the long branches and disorderly branches protruding from the crown to keep the crown surface clean and beautiful. Secondly, it takes a long time for autumn shoots that germinated after flowering last year to grow. When the bud is full, light cutting or medium cutting should be adopted. Light cutting can be used for those with strong growth, and medium cutting can be used for those with weak growth, so as to promote the development of strong lateral branches of axillary buds of mother branches into flower branches. If the fruiting mother branch with fruit overwintering after flowering last year is not pruned, and the nutrient accumulation is less, it should be pruned appropriately, and the short branch is 2/3 ~ 1/2 short, and the short mother branch with full bud eyes at the base is reserved, so as to concentrate nutrition for the new shoots to develop into flower branches. At the same time, it is necessary to cut off the dense branches, horizontal branches and straight branches born in previous years from the base.

Pruning in growth period: the principle of pruning is light pruning, that is, cutting off the top 3 or 4 nodes of growing branches, and not pumping inflorescences to inhibit prolonged growth. Promote flower bud differentiation and grow new flower branches: at the same time, cut off those flower branches with poor growth and high density, staggered cross branches, shady branches, upright branches and long branches from the base to facilitate ventilation and light transmission, concentrate nutrition and make flower branches develop and bloom.

Pruning after flowering of Osmunda japonica: generally, it should be carried out from the flower withering to the young fruit stage, and the flower branches should be cut short according to the medium to strong pruning method. Ensure that the newly grown autumn shoots have a long time to grow and accumulate nutrients before winter. This pruning should not be done too early. If the fruit ripens in autumn, you can also enjoy the fruit. Those with better water and fertilizer management can be pruned in the second flowering in autumn. Cut off the flower branches with the length of 1/3 ~ 1/2 to promote the mother branches to germinate in early autumn and bloom again in late autumn.

Compilation and presentation of green farmers in Jiangxi