Black Diamond Watermelon is an OP variety with maturity of 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, Black Diamond Watermelon can weigh 75-80 lbs. Hardy. Mid-season. Good shipper. Tolerant to Anthracnose and Wilt.
How to grow Black Diamond Watermelon?
Black Diamond Watermelon plants have sparse leaves and need a lot of sunshine and heat to mature their fruit. The Black Diamond Watermelon plant roots are delicate and require high nutrition and lots of water. For all that effort, you’ll be rewarded by the ripest, sweetest watermelons you’ve ever tasted. Read through the handy and useful guide ‘How to Grow watermelon’ and grow refreshing flavorful watermleons this summer!
It is essential to start Black Diamond Watermelon seeds indoors or in a greenhouse mid to late April. Transplant at the end of May or first week of June, when the plants are 5 weeks old. Optimal soil temperature for germination: 20-25°C (68-77°F). Seeds should sprout in 5-10 days.
Sow Black Diamond Watermelon seeds ½” deep. Set transplants 24-36″ apart in rows 5-6′ apart.
Ideal pH: 6.0-6.8. Choose a warm, well-drained soil for Black Diamond Watermelon. Add dolomite lime and compost or well-rotted manure to the bed and ½-1 cup of complete organic fertilizer beneath each transplant. Watermelons need really warm growing conditions. Use black plastic mulch, cloches, or floating row covers. Success may improve in raised beds. Watermelons plants require 8-10 weeks of good, hot growing weather from the middle of June to the end of August. During that time, a melon vine must grow 5-9 leaves before starting to flower, then set 4 or more male flowers before making its first female flower, and then ripen its fruit before cool, damp weather sets in. Watermelons do not ripen off the vine. During the entire growing season, make sure to provide ample water.
Black Diamond Watermelon fruit will ripen in late August to early September. Watermelon is ripe when the tendril nearest to the fruit withers and dries up.
In ideal conditions at least 60% of Black Diamond Watermelon seeds will germinate. Usual seed life: 3 years. Per 100′ row: 60 seeds, per acre: 5.2M seeds.
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