Black Diamond Watermelon Seeds – 10 Seeds, Citrullus lanatus, Sweet Large Melons

Black Diamond Watermelon is a classic open-pollinated variety prized for its large, round-to-oblong fruit and sweet, juicy red flesh. The melons develop a deep green rind that can appear almost black at maturity, making them a striking addition to the summer garden. This variety is well suited to home gardens, market plots, and anywhere growers want a dependable, flavorful watermelon with old-fashioned appeal.

Black Diamond watermelons are known for their vigorous vines and ability to produce sizable fruit when given plenty of sun, warmth, and space. The flesh is sweet and refreshing, ideal for fresh eating, slicing, and summer gatherings. With 10 seeds, this packet offers a practical start for gardeners looking to grow this heirloom favorite.

Plant Features

• Open-pollinated watermelon variety with large, round-to-oblong fruit
• Deep green rind that darkens toward black at maturity
• Sweet, juicy red flesh suited to fresh eating
• Vigorous vining growth habit
• Warm-season annual crop for full-sun gardens

Growing Information

• Botanical Name: Citrullus lanatus
• Plant Type: Warm-season annual
• Sunlight: Full sun
• Soil: Well-drained, fertile soil
• Water Requirements: Moderate; keep soil evenly moist
• Growth Habit: Vining
• Spacing: Space plants several feet apart to allow vines to spread

Planting & Care

Sow Black Diamond watermelon seeds outdoors after the last frost, when the soil has warmed reliably. Plant seeds about 1 inch deep in a sunny, well-drained spot. For earlier starts, seeds can be sown indoors in individual pots a few weeks before transplanting, taking care not to disturb the roots. Keep the soil consistently moist during germination and early growth.

Once established, water regularly, especially during flowering and fruit development. Mulching can help conserve moisture and suppress weeds. Provide plenty of space for the vines to run, and avoid overhead watering late in the day to reduce disease pressure. Harvest when the fruit sounds hollow when tapped and the tendril nearest the stem has dried.

What's Included

10 Black Diamond Watermelon seeds (Citrullus lanatus).