1, an annual herb. The stem is 50~80 cm high, 4-sided, with many branches at the lower part and enlarged nodes. The leaves are ovoid to oblong-lanceolate, 4~8 cm long and 1~2.5 cm wide, with a slightly blunt tip. Leaves on inflorescence axis are small, racemes are terminal and axillary, and panicles are large; Bracts and bracteoles are very small, about 65438±0mm； long; Calyx lobes triangular-lanceolate, ca. 3 mm long, glandular hairy, puberulent.

2. The corolla is white and small, with purple stripes on the lower lip, about 12 mm long, with glandular hairs and pubescence outside, with two lips, slightly 2-cleft upper lip and 3-cleft lower lip, and the corolla tube is as long as the lip; Stamens 2, anthers 2-loculed, 1 loculed base and one side of filament pilose. The capsule is flat, with a groove in the middle, about 65438±00mm long and sparse glandular hairs; 12 seeds, square and wrinkled.

Land selection and preparation:

Andrographis paniculata likes hot and humid climate. I like sunny and fat. The optimum temperature for seed germination and seedling growth is 25~30℃, and when the temperature drops to 15~20℃, the growth is slow. When the temperature drops to about 8℃, the growth stops; All plants will wither when they encounter low temperature or frost around 0℃. Fertile, loose, well-drained acidic and neutral sandy loam is suitable for planting, and alkaline soil with pH8.0 can still grow normally.

It is mainly to water the seedlings in time to facilitate the seedlings to take new roots. Then, every 65,438+05 ~ 20 days, intertillage weeding and topdressing were 65,438+0 times. Topdressing is mainly nitrogen fertilizer, which can flow human and animal manure, urea and so on. Especially in June, July and August, field management is very important, and more nitrogen fertilizer and water should be applied frequently. When the plant height is 30~40cm, the soil can be cultivated to prevent wind damage.