Will it hurt my watermelons to spread on the asphalt?
Spreading Watermelons on Blacktop
Certified GKH Gardening Expert
The vine should be fine, though it may increase the water needs of the plant some, so you should keep an eye on this and provide more water if the plant seems droopy. If you get fruit that develops over the blacktop, I would place straw underneath it so that it is not in contact with the asphalt itself.