Watermelon Black Diamond is a classic open-pollinated heirloom prized for large, round fruits, crisp texture, and sweet, deep crimson flesh. The distinctive dark green to nearly black rind helps protect the juicy interior, while the melons can reach approximately 30–50 pounds under favorable growing conditions.

With full sun, heat, rich soil, and consistent moisture, Black Diamond vines can mature in about 70–80 days. Each packet contains 25 Non-GMO, heirloom seeds, giving you room to establish a productive patch, plan succession plantings, or share with fellow gardeners. Save seed from your best fruit for future seasons when plants are properly isolated from other watermelon varieties.

Texas Minimum Germination Rate: 75%

Why Choose Watermelon Black Diamond?

• Classic Heirloom Flavor: Harvest sweet, refreshing watermelon with crisp, deep crimson flesh for fresh eating and summer gatherings.
• Large Fruit: Grow impressive round melons that may reach approximately 30–50 pounds under ideal conditions.
• Protective Rind: The thick, dark rind helps protect the tender interior during handling and short-term storage.
• Open-Pollinated: Save seed from well-isolated, healthy fruit and select plants that perform best in your garden.
• 25 Seeds per Packet: Plant a generous patch, try succession sowing, or share with other gardeners.

Planting Tips for Success

• Sunlight: Choose a location with full sun and strong heat exposure for the best vine growth and fruit sweetness.
• Soil: Plant in rich, well-drained soil amended with compost. A slightly acidic to neutral soil around pH 6.0–7.0 is suitable.
• Planting: Sow directly after the danger of frost has passed and the soil is warm. In short-season areas, start seeds indoors several weeks early and transplant carefully.
• Spacing: Allow 24–36 inches between plants and provide ample room for the vines to run. Wider spacing improves airflow and reduces competition.
• Watering: Keep soil consistently moist during establishment and fruit development, but avoid waterlogged conditions. Reduce watering as fruit nears maturity to help concentrate flavor.
• Fertilizing: Incorporate compost before planting, then use balanced fertility early in the season. Avoid excessive nitrogen after flowering, which can encourage vines at the expense of fruit.
• Pollination: Protect flowering plants from unnecessary pesticide exposure and encourage pollinators. Hand-pollination in the morning can help when bee activity is limited.
• Harvesting: Look for a dried tendril near the fruit stem, a duller rind, and a creamy yellow ground spot. Cut the melon from the vine rather than pulling it.

Why Choose David's Garden Seeds®?

• Veteran-Owned: Supplying premium seeds since 2009.
• GO TEXAN Certified: Supporting local agriculture and communities.
• Safe Seed Integrity Pledge: Backing our commitment to responsible seed stewardship.
• Vegetable Seed License: David's Garden Seeds® has been granted a Vegetable Seed License for the State of Texas.
• Great Customer Service: David answers all customer service questions, usually within a few minutes.

Cooking Methods

• Fresh Slices: Chill ripe watermelon and serve it in thick slices for a refreshing summer treat.
• Fruit Salads: Combine cubes with berries, melon, citrus, or fresh herbs for a colorful salad.
• Drinks: Blend the flesh into agua fresca, smoothies, lemonade, or a fresh watermelon cooler.
• Salsas: Pair diced watermelon with cucumber, lime, herbs, and a touch of chili for a bright fruit salsa.
• Grilling: Grill thick wedges briefly to bring out a richer, caramelized flavor.

Order Watermelon Black Diamond Seeds Today

Grow a legendary heirloom watermelon with bold flavor, striking dark rind, and impressive garden presence.

Nutritional Information

Applies to harvested watermelon rather than planting seeds. Per 1 cup diced watermelon, approximately 152g:

• Calories: 46
• Total Fat: 0.2g
• Sodium: 2mg
• Total Carbohydrate: 11.5g
• Dietary Fiber: 0.6g
• Total Sugars: 9.4g
• Protein: 0.9g
• Vitamin C: 12.3mg (14% Daily Value)
• Vitamin A: 43mcg RAE (5% Daily Value)
• Potassium: 170mg (4% Daily Value)

Important Disclosures

• Variety Disclaimer: Heirloom varieties may show natural variation in fruit size, shape, color, flavor, and maturity. Results vary with climate, soil, pollination, and growing conditions.
• Seed Storage: Store seeds in a cool, dry location away from direct sunlight. Properly stored seeds may remain viable for several growing seasons.
• Planting Zones: Watermelon is a warm-season crop. Plant after frost when soil and air temperatures are reliably warm, and use local conditions to determine the best planting and harvest timing.

Grow something beautiful. Grow something delicious. Grow with David's Garden Seeds®.