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Make sure the water is at theMake sure the water is at the proper level (including, not too high). Watermelons may wilt during the heat of the day, but should perk back up at night. If not, check for pests such as aphids or squash bugs, or the squash vine borer. Fusarium wilt can also cause vines to wilt at midday, with leaf margins drying, but hopefully that's not the case with your plants. As the plants grow, they will need support--provide trellising, and support the fruit as it grows.

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