At present, the fruit tree varieties widely used in urban micro-green belts are hawthorn varieties such as' Open' and' Dawang', peach varieties such as' China Shoutao' and' Flat Peach', pear varieties such as' Crystal Pear',' Yali Pear' and' Golden Pear', and pomegranate varieties such as' Zuimei',' Taishanhong',' Jufeng' and' Golden Pear'.

The dwarfing bonsai of fruit trees are mostly placed indoors or in small spaces such as urban micro-green spaces, and the height of fruit trees needs to be controlled. Because the growth of fruit trees is too weak or too strong to form flower buds, in order to ensure the formation of flower buds, it is necessary to control the growth of fruit trees and dwarf them.

Dwarfing of fruit trees can be achieved by ecological, physical and chemical methods. According to the growth characteristics of plants closely related to the ground and underground, the ecological method of reducing the volume of basin soil can be used to realize the dwarfing of fruit trees. For apple, pear, citrus, peach and other fruit trees, mature dwarf rootstock technology can be adopted. Physical pruning of fruit trees before germination in spring can help them dwarf. When the fruit trees grow too vigorously in the early stage of growth, they can be inhibited by spraying chemical reagents such as B9, PP333 and chlormequat chloride.

Because the volume (basin) space of fruit trees is limited, after a long growth period, the root system will be restricted in the process of continuous growth, which will affect the normal growth of potted fruit trees and reduce their ornamental value. Therefore, it is necessary to trim the roots regularly and change potted fruit trees.

In order to ensure that fruit trees have high ornamental value every year, it is necessary to choose the frequency and opportunity of changing pots reasonably. The frequency of changing pots is too high, and the branches grow vigorously, resulting in less fruit in that year; If the frequency of changing pots is too small, the nutrients in the pot soil will be exhausted, and the aging roots will reduce the absorption capacity of water and nutrients, which will make the fruit trees lose their vitality and reduce their ornamental value. Under normal circumstances, it is more appropriate for fruit trees to change pots every two years 1 time. In order to avoid frostbite in winter and malnutrition of flower buds in late spring, the best time to change pots for fruit tree bonsai is usually at the end of spring freezing, when flower buds have not germinated, so changing pots can buy time for the growth of new roots.

In order to minimize the damage to fruit trees in the process of changing pots, certain steps should be followed: in order to prevent soil balls from scattering, the fruit trees that want to change pots should be watered enough one day in advance; Prune the aging coarse roots and capillary roots when pruning the root system to avoid damaging the root tips of medium roots, because the root tips are the most important parts to absorb nutrients and water; The bottom of the new basin should be evenly covered with nutrient soil, and then slowly put in soil balls; When the remaining space in the basin is filled with cultivated soil, the method of gradual filling and water seepage should be adopted to avoid the damage of external extrusion to the root system.