Charleston Gray Watermelons have red, firm, sweet, and fiberless flesh. Charleston Gray Watermelons are gray-green and cylindrical-shaped. They weigh between 20 to 40 pounds. Charleston Gray Watermelons have a thick rind, which is often used for making watermelon rind pickles. Charleston Gray Watermelons are classic oblong watermelons that date back to the 1950s. Their bright red, fiberless flesh is crisp and sweet. This variety is resistant to fusarium wilt, anthracnose, and sunburn.