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Black Diamond Watermelon Seeds | Heirloom Non-GMO | 30-75 lb Fruit | Sweet Red Flesh | USDA Zones 3-10 |

Black Diamond Watermelon Seeds | Heirloom Non-GMO | 30-75 lb Fruit | Sweet Red Flesh | USDA Zones 3-10 |

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Grow Black Diamond Watermelons from heirloom, non-GMO seeds! These massive melons have sweet, crisp red flesh and a tough, dark green rind. Weighing 30-75 lbs, they mature in 90 days and thrive in USDA zones 3-10. included!


  • Sweet & Crisp Flesh: Bright red, juicy, and flavorful flesh, perfect for summer snacks and desserts.
  • Massive Melons: Produces watermelons weighing 30-75 lbs, with a tough, bruise-resistant rind.
  • Heirloom Variety: A trusted favorite among gardeners and market growers since the 1950s.
  • Sunburn Protection: Large leaves and a tough rind help prevent sun damage.
  • Easy to Grow: Thrives in full sun, matures in 90 days, and grows well in warm climates.
  • Common Name: Black Diamond Watermelon
  • Scientific Name: Citrullus lanatus
  • USDA Zones: 3, 4, 5, 6, 7, 8, 9, 10
  • Color: Dark green rind, bright red flesh
  • Soil: Well-drained, fertile soil
  • Sunlight: Full sun
  • Watering: Regular, keep soil consistently moist
  • Planting Season: Warm season
  • Plant Type: Annual long vine
  • Features: Heirloom, large fruit, sunburn-resistant
  • Fruit Size: 30-75 lbs
  • Days to Maturity: 90 days
  • Plant Spacing: 18-36 inches
  • Planting Depth: 1 inch
  • Sowing Method: Start indoors or direct sow


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