Food Gardening Network

Growing Good Food at Home

Black Diamond Watermelon

Black Diamond watermelons

Black Diamond watermelons

Black Diamond watermelons

Black Diamond watermelons

Black Diamond is an heirloom, open-pollinated variety, and a popular choice for both commercial and home growers for many reasons. Mature melons have very hard, dark-colored rinds and sweet, pink-red flesh. Try to scratch this one with a fingernail to find out if it’s ripe. If it’s too hard to scratch, you’re ready to go.

Sun Exposure

  • Full sun

Soil pH

  • 6.5 to 7.5

Hardiness Zones

  • not frost hardy

Spacing

  • Vines need 3 to 5 feet of space

Moisture

  • Water deeply 1 to 2 inches per week
  • keep soil moist but not waterlogged

Notes

  • 75 to 90 days to harvest
  • Open-pollinated
  • Seeded
  • Flesh is red
  • Weighs 50+ lbs.

Have you grown Black Diamond watermelons? If so, tell us your top tips for ensuring a delicious harvest.

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