Lavender, semi-shrub or small shrub, sparse herbs. Leaves linear to lanceolate or pinnately divided. Cymbals with 2- 10 flowers usually gather at the top of branches to form spikes with discontinuous or nearly continuous ends. Bracts are diverse in shape, shorter than calyx or longer than calyx, veined or absent; Bracteoles small, with or without.

Flowers blue or purple, with short peduncle or subsessile. Calyx is oval or tubular, erect, with 13- 15 veins, 5 teeth, 2 lips, upper lip with 1 teeth, sometimes wider or slightly elongated into appendages, lower lip with 4 teeth, short and equal length, sometimes upper lip with 2 teeth and 3 teeth narrower than lower lip; The fruiting period increased slightly. Corolla tube protrudes, expands near throat, and has a 2-lipped crown, 2-cleft upper lip and 3-cleft lower lip.

Extended data:

Growing habits:

Lavender is very adaptable. The adult plant is resistant to both low temperature and high temperature, and can withstand high temperature of about 40℃ in harvest season. In Huanglong, Shaanxi, lavender plants overwinter safely in the open field at-265438 0℃. In Xinjiang, it is buried in the soil and covered with snow, which can withstand the low temperature of -37℃. The seedlings can tolerate the low temperature of-10℃.

During the growth and development of lavender in the second year, the average temperature is about 8℃, and it takes 10 ~ 15d to start germination. The average temperature is 12~ 15℃, which takes 20 days for plant branches to turn green and grow longer. The average temperature is 16~ 18℃, and it takes 25 ~ 30 days to start budding. The average temperature is 20~22℃, and flowers begin to bloom. The average temperature is 26~32℃, which is the fruiting period.

Baidu encyclopedia-lavender

Baidu Encyclopedia-Lavender (Labiatae)