满江红(各地称为绿萍或红萍)是热带亚热带的浮生水草,不结种子,以营养体越冬。自1962年在浙北嘉兴地区试种推广以来,到1965年巳达32万亩。满江红适宜生长的温度是20℃上下,日平均气温低于15℃则生长速度明显降低,低于5℃则基本上停止生长。初霜仅使叶色变红或紫色(被遮部 Azolla (locally known as Lupin or Hongping) is a tropical subtropical aquatic plants, not seed, to winter nutrition body. Since 1962 in the northern part of Jiaxing in northern Zhejiang try to promote since, by 1965 has reached 32 million mu. Azolla suitable growth temperature is 20 ℃ up and down, the average daily temperature below 15 ℃, the growth rate decreased significantly below 5 ℃, basically stopped growing. The first frost only leaves color red or purple (covered part