Polygonum cuspidatum sieb. et zucc. is a perennial herbaceous plant of the family Polygonaceae. It is also known as Yinyanglian, Huoxuelong, and Suanxuan. It is naturally distributed in various provinces and regions south of the Yellow River and is mainly produced in Zhejiang, Jiangsu, Anhui, and Guangxi. In the early 90s of the last century, Polygonum cuspidatum was introduced into Jilin Province and planted in urban areas of Jilin City and Baishishan and Yanlin. After 10 years of observation, it grew well and could be rooted to reproduce asexually. Polygonum cuspidatum is widely used for landscaping, medicinal use and extraction of natural pigments. 1 Botanical features 2–3m high, stems upright, cylindrical, hollow, with raised longitudinal ridges, scattered red or purple spots. Leaves alternate, leaves broadly ovate to ovate-elliptic, entire or serrulate, stipules membranous. Female and male plants, panicles terminal or axillary, flowers small, red or white. Achenes ovoid, 3-sided, red-brown or black-brown, enclosed in winged perianth. Wild in the edge of the forest, valleys and shrubs. 2 Breeding methods 2.1 Seed propagation Mature seeds can be harvested in the country of origin. In the middle and early April, sowing, according to row spacing 25 ~ 30cm ditch, depth 1cm, the seeds evenly scattered into the ditch, after the cover soil slightly suppress, watering, at a temperature of about 20 °C 10 to 15 days emergence. When the seedling height 5 ~ 10cm seedling planting time, strains, spacing 25 ~ 30cm, strong seedlings per hole left 1 ~ 2 strains. 2.2 The rootless flowering of Polygonum cuspidatum in Jilin Province is not frosted when it blooms, and mature seeds cannot be harvested. Therefore, the propagation of the giant knotweed after propagation is mainly carried out by root division. Before the end of autumn, the stems and leaves withered or the spring seedlings unearthed, the mother plants were shaved and rooted. Each root had 2 to 3 buds, and the ditch was 40cm apart and the ditch depth was 10 to 15cm. The root buds were placed at 15cm spacing. Ditch, earth covering, compaction, watering. The autumn planter emerged in spring and the spring planter emerged in 10 to 15 days. 2.3 The group cultivated seedlings and giant stalks was a plant that could easily induce tissue culture seedlings. Therefore, tissue culture techniques can be used to achieve large-scale propagation. During the growing season, the middle and upper leaf stem segments of Polygonum cuspidatum were used as explants. Induced by ms+ba1.0+naa0.1 medium, induction buds can be induced from the leafhoppers after induction for 10 days; the subculture medium is similar to the induction medium except that the ba concentration is decreased from 1.0 to 0.5 mg/l, subculture The cycle is 40 days, proliferating 3 to 6 times per cycle. Rooting was performed using 1/2ms+iba0.3+naa0.2 medium and rooting after 10 days of culture. Seedlings in the nursery trays are transplanted into the nutrient bowls after survival and are planted in the field when the seedling height is more than 10cm. 3 Utilization value of Polygonum cuspidatum 3.1 The rhizome is cylindrical, curved, red-brown, hard and hard to break. Roots have blood circulation, diuretic Tonglin, detoxification and other effects. Indications for rheumatism, bone pain, women's amenorrhea, scald, malignant sores and dysentery; used as anti-hepatitis B and hemostasis in people, with good results. Three-year harvesting with seed propagation, root propagation and tissue culture Two-year harvesting of seedlings. Roots are excavated in spring or fall, fibrous roots are removed, washed and dried. Fresh root can be used with it. 3.2 Polygonum cuspidatum can be extracted pigment, its color is non-toxic, can be produced as a natural food additive. 3.3 Polygonum cuspidatum has strong adaptability, the plants are tall, the branches are prosperous, and the rhizomes are proliferating. The wood is a good herb for water and soil conservation. There are knots on the ground. The whole plant resembles bamboo when unearthed. It has a certain ornamental value.
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