Pruning techniques of Populus tomentosa

Young trees such as Populus tomentosa grow vigorously. We should give priority to plastic surgery, and cut off the flower branches properly every time to promote the formation of more lateral branches after axillary buds germinate. Diseases and insect pests, dead branches, artificially damaged branches and long branches should be cut off from the base through thinning. After entering middle age, Populus euphratica plants grow in clusters and many old branches gradually lose their regeneration ability. At this time, short cutting should be stopped, and a part of the branches that are too dense in the cluster should be thinned out from the base to make room for the growth and development of new branches of all-red poplar and Chinese red-leaf poplar, and maintain the complete plant shape. Cut off the residual flowers and young fruits in time after the flowers wither, so as not to consume nutrition and affect the next year's flowering. For aged plants, regeneration and rejuvenation are the main methods, and the method of heavy and short cutting is adopted. In the first year, the old branches of 1/2 were cut off, and the remaining half of them were all used to maintain the original tree shape, so that people could continue to watch and provide assimilated nutrients for the growth of new branches, and then the remaining half of the old branches were cut off two years later. In this way, nutrition is concentrated on a few axillary buds, and strong branches are sprouted. In addition, weak branches, diseased branches and dead branches should be removed.

In order to improve the ornamental effect of Populus tomentosa. Prune it in early spring every year. First of all, the trunk should be kept upright, with a height of about 2.5 meters, so that the lateral main branches are exposed from the top of the trunk, thus forming an umbrella-shaped round and muddy crown. When pruning in winter, the dead branches, dead branches, upright upward branches and drooping branches should be thinned from the base to make the whole crown roughly pruned into an umbrella-shaped skeleton; Selectively pruning overlapping branches, parallel branches and cross branches, and pruning the whole crown of all-red poplar and red-leaf poplar into layers to make the branches and leaves have more space; Trim the branchlets, try to cut off the upper branches and leave the upper branches. Sparse the branches growing below from the base and cut the remaining branches short. Be sure to pay attention to the direction of cutting buds when cutting short. It is advisable to choose the bud obliquely above the branches as the cutting bud, and its direction is the direction of growing new branches in the future, otherwise it will affect the appearance of all-red poplar and red-leaf poplar. According to the actual situation, the cut buds can also be left on the side with growth space to make up for the vacancy in the crown. The buds on elm rootstock should be drained as soon as possible, otherwise the crown shape will be destroyed and the ornamental effect will be reduced. During the whole pruning process, the removed branches should be cut off from the base without leaving piles, and the incision should be smooth and cut into horseshoes.