The propagation method of periwinkle is sowing seedling, also can be cuttings seedling.

1, sowing seedlings

Sowing seeds by sowing method, 1000 grains/square meter or so. After sowing the seeds should be covered with thin sand, do not make the seeds directly to the light, with a fine spray bottle watering, cover the film or grass curtain to keep the soil moist, 7 to 10 days to seedling. Seedling after the removal of film or grass curtains, gradually strengthen the light. Seedlings grow slowly, and grow faster when the temperature rises. To timely inter-seedling. In order to prevent periwinkle sudden collapse disease should be sprayed with 800 times chlorothalonil or metribuzin once a week for 2 to 3 weeks.

2, cuttings

Cuttings more in April to July, cuttings should be used to propagate the growth of strong without pests and diseases of the seedling shoots for the spike, the general selection of plant apical length of 10 to 12 cm of the shoots, the length of the spike to 5 to 7 cm is appropriate. Cuttings substrate selection of vegetative sand, vermiculite, charcoal mixed substrate, wrapped in a small mud ball at the base of the cuttings, cuttings in a cold bed, room temperature 20 ~ 24 ℃, after 20 days or so rooting, to be rooted after the spikes can be transplanted to the pot. Because the cuttings breeding seedlings growth is not as good as sowing live seedlings, it is rarely used in cultivation.

Daily maintenance of periwinkle

1, temperature control

Periwinkle is more sensitive to low temperatures, so temperature control is very important. In the Yangtze River Basin in the winter must be used in protected cultivation, below 15 ℃ to stop growing, below 5 ℃ will be subject to frost damage. Because periwinkle is more tolerant of high temperatures, it is often applied in the Yangtze River Basin and South China in the summer and the National Day and other hot seasons.

2, water and fertilizer management

Plant rot after rainfall of periwinkle, rainfall places need to be planted in greenhouses, the medium needs to be well drained for completely artificial cultivation, it is appropriate to use the fertilizer 20-10-20 and 14-0-14 water-soluble fertilizers to 200 ~ 250ppm concentration of 7 ~ 10 days of alternating application. Reduce the amount of 20-10-20 fertilizer used in winter when temperatures are low. If ordinary soil is used as the medium, compound fertilizer can be used as the base fertilizer by mixing the appropriate amount before the medium is potted. When the fertility is insufficient, then apply water-soluble fertilizer.