(1) Cut branches from the base. Through thinning, the stump has good ventilation and light transmission, concentrated nutrition supply and vigorous growth. Early thinning of young trees can be beneficial to normal development and growth; Thinning during plastic surgery can make the left modeling branch get sufficient nutrition and accelerate modeling; The molded stump bonsai can play a role in balancing nutrition through thinning, making it old and enduring.

(2) When thinning, the first thing to do is to cut off the branches of pests and diseases and burn them immediately to prevent the spread of pests and diseases. Secondly, we should cut off the branches that hinder the appearance in time. Generally, two parallel branches that are very close to each other should be cut off, and overlapping branches and opposite branches should be cut off; Keep only one verticillate branch, and cut off all the others; The long branches, upright branches, drooping branches and anti-branches on the main branches should be cut off. Branches and cross branches should be cut off one by one. The sprouting branches of tree species with strong germination ability should be cut off as soon as possible, in addition to leaving a branch in the missing part for slowly inducing and replenishing branches, so as not to consume nutrients and affect the tree potential. The arrangement of branches in pile landscape should also obey the requirements of artistic modeling. All redundant branches that do not meet the modeling requirements should be cut off.

2. Shortcut:

(1) That is, the long branches are cut short, which stimulates the axillary buds under the scissors to germinate and form strong lateral branches, so as to promote their branching and facilitate modeling.

(2) In plastic surgery, after thinning the redundant branches, the remaining modeling branches need to be cut short, so that the modeling branches will sprout 2-3 times a year. Once sprouted and chopped, the number of branches of modeling branches will increase rapidly, and the order of each branch will be shortened without lengthening the branches. Therefore, short cutting is an effective measure to control the growth of stump bonsai and maintain its dwarfing, and it is also an important means for stump to have the shape and shape of a big tree as soon as possible.

3. Shrinkage and shearing:

(1) Retracting and pruning perennial branches is a powerful measure to shrink big trees, and it is also an important means to promote the germination of new branches and restore tree vigor.

(2) For garden plants with good stump posture, but large crown and long main branches, it is impossible to meet the requirements of garden modeling only by short cutting and thinning annual branches. By reducing felling, trees can be made smaller, which is beneficial to landscape modeling; For some tree species with strong germination ability, the cutting amount can be larger, that is, the branches and leaves can be trimmed, and only the skeleton of the stump can be retained to stimulate the germination of new branches under cutting.