(Citrullus lanatus) 95 days. Black Diamond Open Pollinated Watermelon is a large melon with a glossy, solid black green rind. Flesh is red and juicy, a hardy midseason variety. Black Diamond is great for the home heirloom garden.
Planting Instructions for Black Diamond Watermelon Seeds
Black Diamond Watermelon are heat loving plants that prefer well drained loose soil and an even amount of water. Plant heirloom watermelon in rows or hills but make sure the soil is well warmed. In cooler climates, you can start watermelon seeds indoors 2-4 wks. before last frost to extend the growing season. Plant seeds ½ – 1″ deep. Plant seeds or set out heirloom watermelon transplants in full sun. For rows plant 6-12″ apart, in rows 6-10′ apart. For hills plant 4-6 seeds per hill, in 1′ diameter hills, with hills 6-10′ apart. Germination should occur in 3-10 days in soil 70-85°F. In hills thin to 2 plants per hill. In rows thin plants to or set out transplants 24-36″ apart. Harvest heirloom watermelon when fruit sounds hollow when thumped, when surface color turns dull, or underside turns yellow.