WATERMELON – BLACK DIAMOND (OP) 90 days. Large melon with a glossy solid black-green rind with deep red, tender, crisp, sweet flesh and large grayish black seeds, weighing 40-45 lbs. When properly pruned and weather and soil conditions are favorable, they can weigh 75-80 lbs. Hardy. Mid-season. Good shipper. Tolerant to Anthracnose and Wilt.