In spring, summer and autumn, the germination time of cosmos seeds is 5~8 days and 4~7 days respectively. It takes about 65,438+05 days for all seeds to germinate, and some seeds germinate slowly. The germination time of cosmos seeds is mainly related to temperature and humidity, and the germination time of cosmos seeds is the shortest in the normal 25-degree moist soil environment.

The seed size of cosmos is average, and the emergence level is very strong. It is suggested that shallow sowing can be carried out, and the depth of soil cover should not exceed 5cm. Usually choose the seed sowing method and choose the condition with low wind. The seeds of the universe are mixed in wet sand and then scattered on the ground. After sowing, the seeds can be covered with artificial soil or mechanical soil, covered with fine soil and watered once for about 6~ 12 days to improve the germination rate.

Cosmos is an autumn English plant in Compositae, native to America and Mexico, and widely cultivated in China, Yunnan and western Sichuan. Cosmos likes light plants, likes light, resists barren soil and avoids chemical fertilizers. The soil is too fertile, too hot and stagnant. It is an annual or perennial herb with a height of1~ 2m; Leaves deeply pinnate, lobes linear or filiform; The head is solitary, and the style has short and pointed appendages; Achene is dark purple, 8 ~12mm long, flowering in June-August, and bearing fruit in September-65438+1October.