Seed or cuttage propagation.
1. Seed propagation: sow on a flat bed in March-April. Soak the seeds for 2-3 hours before sowing. When sowing, insert the tip of the seed downward into the soil, with a spacing of 5 cm, a row spacing of 7-8 cm and a covering of 2 cm. Before winter, use a shed for shade and cover it with plastic film. When transplanting in the next spring, you should bring a soil ball.
2. Cutting propagation: cutting in July. The young (10-year-old) mother tree with rich tissues was selected as cuttings and cut into 1 5 ~17 cm segments. Soak the cuttings base in the solution of NAA for 1 ~ 3 seconds, and then insert it into the cuttings bed prepared in advance, and the cuttings depth is 1/3 ~ 1/2 of the cuttings length. Remove the leaves from the buried part. Set up a shed to shade the sun, and cover it with plastic film before winter.