Black Diamond Watermelon Seeds produce a classic Heirloom, Non-GMO variety known for its large size, deep dark-green rind, and sweet red flesh. This traditional watermelon type performs well in warm climates and is valued for uniform growth and high productivity. Plants have strong vines, good heat tolerance, and consistent fruit development. Suitable for home gardens, small farms, and growers seeking traditional open-pollinated watermelon varieties.

Key Features

• Heirloom and Non-GMO seed variety

• Large, dark-green rind with bright red interior

• High-yield vines with strong growth

• Heat-tolerant and suitable for warm regions

• Open-pollinated and reliable for seed saving

• Ideal for home gardens and field cultivation

Specifications

• Botanical Name: Citrullus lanatus ‘Black Diamond’

• Seed Type: Heirloom, Non-GMO

• Fruit Size: 30–50 lbs (can grow larger in optimal conditions)

• Rind Color: Dark green to nearly black

• Flesh: Bright red, sweet

• Days to Maturity: 85–95 days

• Growth Habit: Spreading vines

• Sunlight: Full Sun

• Plant Type: Warm-season annual

• Spacing: 3–5 ft between plants

Planting Guide

• Soil Preparation: Use well-drained, loose soil enriched with organic matter.

• Sowing Time: Plant outdoors after frost when soil temperature reaches 21–29°C.

• Sowing Depth: 1.5–2.0 cm deep.

• Spacing: 90–120 cm between plants; 150–200 cm between rows.

• Watering: Keep soil consistently moist during germination. Reduce watering as fruits mature.

• Germination: 7–12 days in warm soil.

• Fertilization: Apply balanced nutrients during early growth, then reduce nitrogen as fruit develops.

• Harvesting: Harvest when the underside turns creamy yellow, tendril near the stem dries, and rind appears dull.