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Hi, Lilly, On watermelons,Hi, Lilly, On watermelons, you should see flowers on the vines first (not fruit). The first flowers to appear on the vines are male. The female flowers, which open later, have a swelling at the base that forms the fruit (the ovary). After bees pollinate these female flowers, the fruit develops. Poor fruit set in watermelons is usually a result of poor pollination. Bees are necessary to transfer the pollen from the male to female bloom. Common causes of poor fruit set include lack of bees for pollinating or cool, wet weather that slows bee activity during bloom. Also, very hot weather or water stress could be a problem.

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