1, sowing and breeding

(1), usually planted in March-May. The suitable temperature for seed germination is 20 ~ 25℃. In order to blossom early, you can sow seedlings in the greenhouse in early spring, give them an environment of 20℃, and move them to the open field for cultivation in spring.

(2) The seedbed should be located in Gao Shuang, facing south and facing the sun, with good drainage. It is best to use peat+perlite at the ratio of 3∶ 1, or use humus, and pour it thoroughly with 500 ~ 600 times of carbendazim solution. After a little drying, loosen the soil and level it to make the border1.2m wide.

(3) Sowing by sowing method, about 1000 grains /m2. Cover with fine sand after sowing, cover with film or straw mat after watering with a fine watering can, keep the soil moist, and seedlings can emerge in 7 ~ 10 days.

(4) Remove the film or straw cover after emergence, and gradually strengthen the light. Lay eggs in time. To prevent collapse, 800 times chlorothalonil or thiophanate methyl should be sprayed once a week for 2 ~ 3 weeks. ?

2. Cutting

(1), cutting is mostly carried out in April-July. When cutting propagation, mature shoots with strong growth and no diseases and insect pests should be selected as cuttings. Generally, we should choose the shoots with the top length of 10 ~ 12 cm and the cutting length of 5 ~ 7 cm.

(2) The cutting substrate is a mixed substrate of plain sand, vermiculite and peat. The base of the cuttings was wrapped with mud balls, and the cuttings were cut in a cold bed at room temperature of 20 ~ 24℃ and took root for about 20 days. After the cuttings take root and survive, they can be transplanted into flowerpots.

Extended data:

Growth habit and distribution range of Catharanthus roseus

1, Catharanthus roseus likes high temperature and humidity, semi-shade tolerance, not cold tolerance, and the optimum temperature is 20℃-33℃, and it likes sunshine. Ordinary soil can be cultivated, but saline-alkali soil is not suitable. Sandy soil with good drainage, ventilation and air permeability or soil rich in humus is better.

2. Catharanthus roseus is native to China, Indian and tropical America. Catharanthus roseus has a short cultivation history in China, mainly distributed in the south of the Yangtze River, and is more common in Guangdong, Guangxi, Yunnan and other provinces (autonomous regions).

Baidu encyclopedia-Catharanthus roseus