Abstract: The effects of different planting densities on the growth and development of annual Polygonum cuspidatum Sieb.et Zucc. seedlings were analyzed, and the growth and development of biennial seedlings under the planting density of 5 cm×5 cm. The results showed that different planting densities had an effect on the stem diameter of annual Polygonum cuspidatum Sieb.et Zucc. seedlings, but had no significant effect on the number of stem branches. Under the cultivation density of 5 cm×5 cm, biennial Polygonum cuspidatum Sieb.et Zucc. seed seedlings had more roots, longer taproots, taller stems on the ground, more bud heads, stem diameter≥0.74±0.15 mm, bud heads≥2. It may be that the planting density and years of Polygonum cuspidatum Sieb.et Zucc. seed seedlings are positively correlated with the underground rhizoma length and stem diameter growth of Polygonum cuspidatum Sieb.et Zucc. seedlings in the growth process, which needs further study.

Key words: Polygonum cuspidatum Sieb.et Zucc., planting density, seedling, growth