Single tree planting, also known as exclusive tree, is used for shading or as the focus of local main scenery.
Generally, trees are required to be tall and majestic, with lush foliage, beautiful tree shape and lush growth.
When shaping this kind of tree, we should first cultivate a medium-height trunk, which is tall and strong.
Branches below 1.0 ~ 1.5 meters should be all cut off as soon as possible after the trees are planted, and then with the continuous increase of trees, the meristems at the lower part of the crown should be thinned out year by year.
There is no fixed rule for the trunk height of shade trees and solitary trees, which should mainly meet the requirements of the surrounding environment and also depend on the ecological habits and biological characteristics of tree species.
As a shade tree, the height of the trunk is higher to provide free space for tourists, which should generally be between 1.8 ~ 2.0 meters; Most of the trunk trees planted in the center of hillside or flower bed are less than 1 m.
The crown size of shade trees and single trees and the ratio to tree height change according to the growth and development habits of tree species and greening requirements.
Shading trees make the crown as large as possible to give full play to its protective functions such as shading, and for some tree species with thin bark, it can also prevent sunburn and dry skin.
It is generally considered that the crown of shading trees for shading accounts for more than 2/3 of the height of trees and is not less than 1/2. If the crown is too small, it will affect the growth and health of trees.
The overall pruning of shade trees and solitary trees generally adopts natural tree shapes, which do not need careful pruning, and usually only conventional pruning is carried out.
In the dormant period, when the labor force is not tense, the branches that are too dense, residual branches, diseased branches, dead branches and branches that disturb the tree shape will be thinned out, and a healthy and straight tree posture will be cultivated, giving people a healthy and tidy impression.
Some also carry out special modeling and trimming according to the requirements of configuration to present better viewing effect.