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.