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Black diamond watermelons are known for their enormous size and their juicy, sweet flesh. This heirloom variety is popular for home gardens.The dark, blue-green-black melons have rich red flesh. and typically lack the usual stripes of more familiar watermelon varieties. Like all melons, the black diamond watermelon requires lots of sunshine. At least 6 to 8 hours every day are needed to keep these plants growing strong.

Watermelon Black Diamond

  • These large, sweet melons can take around 90 days to mature and need plenty of sunshine and water to keep them strong and healthy. These vines can grow to 20 feet in length and work best when allowed to trail along the ground. Trellising is not recommended due to the heavy weight of the fruit. When growing watermelons on the ground you can discourage rot and soft spots by placing the fruit on a piece of wood or cardboard to help keep them dry as they ripen.