Watermelon seeds are the dried, mature seeds of the watermelon, Cucurbitaceae. The tendrils of watermelon are stout and pubescent, and the petiole is thick, 3-12 centimeters long, 0.2-0.4 centimeters thick, with inconspicuous grooves, and densely pilose.

The leaf blade of watermelon is papery, triangular-ovate in outline, whitish-green, 8-20 centimeters long, 5-15 centimeters wide, hispidulous on both sides, more on the veins and abaxial surface, 3-parted, the middle lobe is longer, obovate, oblong-lanceolate, or lanceolate, with an acute or acuminate tip, and the lobes pinnately or bi-pinnately lobed or partially lobed, with undulating or sparsely toothed margins.

Growth habit of watermelon.

Watermelon prefers warm, dry climate, not cold, the optimal temperature for growth and development of 24-30 degrees, the optimal temperature for the development of root growth and development of 30-32 degrees, the minimum temperature of root hairs occurring 14 degrees. Watermelon needs a large temperature difference between day and night in the process of growth and development. Watermelon is drought-resistant, not humidity-resistant, and is susceptible to disease when there are many cloudy and rainy days and too much humidity. Watermelon prefers light, and watermelon has a long reproductive period, so it needs a lot of nutrients. Watermelon with the growth of the plant, the amount of fertilizer required gradually increased, to the fruit vigorous growth, reached the maximum value.