A, wintersweet plastic pruning several plastic ways:
(1) Single-stem pruning and shaping method
The crown of the tree generally adopts a natural and gratifying shape.
1. First year pruning and coring method
In the winter of the first year, the robust branches of 1 year-old seedlings were selected as the main planting, leaving short about 1750px.
A bud with the opposite direction to the bud at the lower interface is left under the cutting mouth as the trunk extension branch, the remaining branches of the cutting mouth trunk are removed from the strong branches, and the weak branches are left as the auxiliary branches, which are drained when the crown is formed.
In order to make Chimonanthus praecox bloom before it is formed, the short and medium branches on the trunk should be cut off in summer to promote branching, and the core should be picked once every three pairs of buds, sometimes even when 1-2 pairs of buds occur, and the cutting in summer usually stops in March-June and July-August.
2. Pruning method in the second year
The next winter, lengthen the trunk, cut the branches short, leave a bud under the incision and change the direction. In order to prevent the lateral branches under the cutting mouth from growing too vigorously and competing with the central branch, two pairs of lateral branches under the cutting mouth bud must be cut off. The left branch is only used as an auxiliary branch, which should not be cut short, and should be grown at a slower speed.
In summer, coring can control the growth of lateral branches and promote the growth of main branches.
3. Pruning method in the third year
The winter of the third year is the same as that of the previous year, except that the top of the trunk is cut off to prevent it from elongation and increase, and three staggered buds are left under the incision as the main branches.
In order to make it continue to elongate, according to the growth intensity, 15~500px is left as the cutting tip, and a bud is left at the cutting mouth to change the direction of new branches and weaken their growth.
If you leave the upper and lower opposite buds, you can cut a section together with the mother branches in summer, leaving the square buds as branches.
In the range of about 750px from the three main branches, choose an oblique branch to cut off the top, and leave 1 lateral bud as a side branch at the incision. The upper branches of the main branches are arranged on the corresponding side to avoid overlapping.
For other branches on the main branch, the strong ones leave the basal buds for re-cutting; The middleman is long, the weak branches and leaves 1~2 buds are short, and two medium and short branches will be issued next year.
4. The fourth year pruning method
In the fourth year, the cutting method is the same as before, but the second side branch is in the opposite direction.
(2) Trunk 3 main branch pruning and shaping method
According to the simple pruning method of flowers and ornamental trees, the trunk is 750px, three main branches are cultivated, and then the lateral branches are divided. Leave 3~5 pieces on the flower branches, and the length of new branches will reach 1000px to promote flower bud differentiation.
(3) Three Books Trimming and Shaping Method
The shape of a plant gives off three main branches directly from the root.
(4) Multi-stem pruning and shaping method
In the first year, the cluster branches directly take more than three strong branches that are straight out from the root and evenly distributed around as the trunk, cut them short and leave 3~5 sections long.
In the second year, the main branches are properly hoop-shaped to avoid overlapping branches and cross branches.
? ? Second, the specific operation of pruning wintersweet tree
(A) the reserved trunk
Chimonanthus praecox has strong tillering ability, often sprouting a large number of long branches from the roots, but these long branches generally do not differentiate flower buds. Therefore, Chimonanthus praecox should leave a trunk of about 30 cm, then cultivate three main branches, and then branch out side branches on them.
(2) Nucleation and sharpening
After the crown is basically formed, the extended branches of the main branches are picked or cut off in summer to weaken their growth. Fragile branches are supported by columns to keep their vertical orientation and promote their growth. In winter, the three main branches are cut off 1/3, so that they can sprout new buds and select excellent side branches. The lateral branches on the main branch should be gradually shortened from top to bottom to make them dispersed.
(3) Short side branches
The flower buds of Chimonanthus praecox are solitary on branches and differentiated from axillary buds of new branches in that year. At the top of the chopped side branch, 3 ~ 4 slightly longer side branches can be formed in the upper part and many small side branches can be formed in the lower part. These lateral branches are the main flowering branches and will produce a large number of flower buds.
(4) Fruit removal, core removal and back cutting.
On the one hand, young fruits should be picked after flowers wither, on the other hand, they should be pruned in time. When pruning, leave 3 pairs of buds at the base to promote the multi-branch of Chimonanthus praecox. It is also possible to take off the terminal buds after the new branches grow 2 ~ 3 pairs of buds, and repeat coring for 2 ~ 3 times to promote the germination of secondary buds.
(5) New shoot truncation
In late summer and early autumn, the top of new shoots should be pruned to make the flower buds of middle and lower branches fully developed and full, so as to prepare for winter flowering. Generally 10 cm branchlets leave 4 ~ 5 pairs of buds.
(6) potted wintersweet treatment
For potted Chimonanthus praecox, two pairs of buds should be left on the annual branches after flowering, and all the others should be cut off.
data source
Green Tsinghua wood. com: /information/detail.php？ topic_id=47 129
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