10- 15 days. Rosa roxburghii can germinate in 10 ~ 15 days after grafting Jiyi. Rosa roxburghii is the fruit of silk reeling flower in Rosaceae. The flesh of Rosa roxburghii is crisp and sweet, with rich flavor and rich nutrition. It is a good fruit for nourishing and keeping fit. When autumn is ripe, it can be eaten fresh or dried in the sun as medicine, which has the effects of promoting digestion, strengthening the spleen, astringing and stopping diarrhea.