Greening tree saplings are not easy to survive by cutting and propagation, mainly because the cuttings are difficult to root. In the production practice, many methods to promote rooting have been summarized:

Selection of saplings

To increase the survival rate and obtain good new plants, the cutting itself is an important factor. Cuttings should have the excellent characteristics of this variety, grow robustly, be free from pests and diseases, and be of appropriate thickness. New branches, long branches, and thin branches are more difficult to survive. For hard cuttings, choose 1-2 year-old branches with short internodes, large buds, and sufficient nutrients in the branches, and cut the middle of the branches as cuttings. But cypress, cedar, etc. prefer the tips with top buds. For tenderwood cuttings, select cattle. Long, robust, well-developed, and disease-free cattle of the year. Tender shoots are used as cuttings.

Treatment of sapling cuttings

Physical treatment methods. There are many physical treatment methods, including mechanical treatment, softening treatment, drying treatment, hot water treatment, increasing the bottom temperature, high temperature electrostatic treatment, ultrasonic treatment, low temperature treatment, etc.

1. Hot water treatment: also known as warm soup method. It means that the lower part of the cuttings is soaked in warm water before cutting, which can promote rooting. This method is suitable for species that contain root-inhibiting substances in the branches, such as pine seedlings.

2. Chemical treatment methods. There are many medicines available, mainly including three categories: growth regulators, common chemical reagents and nutrients.

3. Softening treatment: Use black cloth, impermeable black paper or soil to wrap the branches before taking the cuttings. After about 3 weeks of growth, the shading branches will become white and soft. Cut them for 1^ cuttings. Easier to take root. Because darkness can promote the formation of root tissue. The softening treatment is only ineffective for some woody seedlings, and only effective for growing branches.

4. Increase the bottom temperature: When cutting hard branches in early spring, the temperature rises faster than the ground temperature, and the cuttings are not easy to survive. It is advisable to increase the bottom temperature of the cutting bed. There are methods such as heating by electric wires and heating by hot water pipes.

5. Mechanical treatment: There are methods such as ring peeling, engraving or constriction. Used for woody seedlings that are difficult to root. During the growth period, first circumscribe, cut or tie the base of the branches with twine to prevent the transfer of nutrients from the upper part of the branches to the lower part, so that the nutrients are concentrated on the injured part, and then cuttings are cut here for cutting. Due to sufficient nutrients, it is not only easy to root, but also the seedlings have strong growth potential and high survival rate.