Pruning can reduce the number of branches and buds, make the centralized supply and retention of nutrients fully developed, and avoid unnecessary consumption of nutrients. Pruning can also change the growth direction of branches and guide them to extend in the required direction.
Pruning can restore or balance the growth potential of the whole plant, promote the vigorous growth of weak parts, and inhibit the partial relief of overgrowth (heavy pruning of weak branches and light pruning of strong branches). When pruning, the branches damaged by pests, weather and man-made hazards can be cut off, which can avoid the spread and expansion of pests and diseases in the injured parts. Remove bad branches by pruning, such as dry dead branches, overlapping branches, redundant branches, crossed branches, etc. It can promote the germination of new branches and buds, ensure the ventilation and light transmission of trees, and achieve the purpose of cultivation. (2) Create various artistic shapes and the best environment: to make ornamental flowers and trees colorful and unique in shape, they can all be done by shaping and pruning.
Plastic pruning can not only cultivate the crown into a shape that meets specific requirements, but also coordinate the size of the tree and create various artistic shapes.
For example, in natural gardens, the natural posture of trees is maintained to create a natural artistic conception, while in conventional gardens, ornamental flowers and trees are trimmed into various geometric figures in order to coordinate with gardens.
Moreover, when ornamental trees are matched with architecture, landscape, pavilions, cloisters and other garden sketches in garden space, in order to create a complementary artistic effect, it is necessary to control the shape and size ratio of trees through modeling and pruning to keep them beautiful and practical.
(3) Other functions of ornamental flowers and trees pruning: Due to the limitation of surrounding environmental conditions, it is often necessary to adjust ornamental flowers and trees with different shapes, and pruning is a common method. For example, the crown of street trees often collides with overhead wires. In order to avoid the contact between the tree crown and the wires, street trees are often cut into "cups" so that the wires can pass through the middle of the cups.
Ornamental flowers and trees can also achieve some other purposes by shaping and pruning.
For example, controlled fruit pruning of Platanus acerifolia can effectively alleviate the problem of floating hair of Platanus acerifolia; In areas hit by typhoons, some trees are prone to lodging in strong winds because of their dense branches. Through thinning and pruning, wind pressure can be reduced and trees can be prevented from lodging.