90% of watermelon is water, sugar content is not very high, about 8% sugar per 100 grams, containing fructose and sucrose, of which the fructose content is higher than sucrose, the energy content of about 25 kcal per 100 grams, it is not a high-calorie fruit. Watermelon can not only supplement the water needed by the body, but also supplement a variety of vitamins trace elements.
Watermelon, annual trailing vines; stems and branches stout, with obvious ribs. Tendrils stouter, pubescent, petiole thick, densely pilose; leaf blade papery, triangular-ovate in outline, whitish-green, both sides with short stiff hairs, leaf blade base cordate. Monoecious. Female and male flowers are borne singly in leaf axils. Male flowers: pedicels 3-4 cm long, densely yellow-brown villous; calyx tube broadly campanulate; corolla yellowish; stamens nearly free, filaments short, anther locules flexuous. Female flowers: calyx and corolla as in male; ovary ovate, stigma reniform. Fruit large, subglobose or ellipsoid, fleshy, juicy, pericarp smooth, colored and ornamented in various ways. Seeds numerous, ovate, black, red, both surfaces smooth, base obtuse-rounded, usually slightly arched at the margin, flowering and fruiting in summer. Cultivated throughout China, there are many varieties, with a variety of exocarp, pulp, and seed forms, and it is best known in Xinjiang, Lanzhou in Gansu, Dezhou in Shandong, and Dongtai in Jiangsu. Its original species may come from Africa, widely cultivated in the world's tropical to temperate zones, and then introduced to China.