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A single watermelon can weigh up to 25 lbs. But the growing cycle of watermelon begins with a tiny black and brown seed. This flat, teardrop-shaped seed is no bigger than half an inch long.
During germination, the seed sprouts a tiny stem called a hypocotyl. This stem allows the plant to root in the soil. The seed embryo then develops radicles that eventually develop into the primary root.
In about 5-10 days, four or five leaves will replace the tiny embryonic leaves. This growth is known as the first set of true leaves.