Summer black grapes generally mature in the middle and late July. Summer black grape, an early-maturing seedless variety, is cultivated in the open field, and it takes 100- 120 days from germination to fruit ripening. Greenhouse cultivation, under the condition of controlling moisture and temperature, germinates about 30 days earlier and matures about 30 days earlier than open cultivation.

The origin of Xiahei grape is Japan, and it is a European-American hybrid grape bred by crossing Kyoho grape and seedless white grape. Summer black grapes are earlier than ordinary grapes, and their fruits are purple-black or blue-black, with the characteristics of high sugar content, low acidity, seedless, fragrant, sweet and crisp meat. Strong disease resistance, fruit does not crack and does not drop seeds after ripening.