Answer: Unfortunately the answer depends on the variety of watermelon and the summer weather. Some varieties ripen in 74 days and others ripen within 100 days. Some gardeners determine the ripeness of a watermelon by thumping it, with a resulting ringing sound if it's green, and a dull or dead sound if it's ripe. Other gardeners harvest when the 'pigs-tail' curl where the watermelon attaches to the vine turns brown. Look at the bottom surface of the watermelon. If the spot on the bottom has turned from a light straw color to a rich yellow or orange color, the watermelon is ready to harvest.
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