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.
- Full sun
- 6.5 to 7.5
- not frost hardy
- Vines need 3 to 5 feet of space
- Water deeply 1 to 2 inches per week
- keep soil moist but not waterlogged
- 75 to 90 days to harvest
- Flesh is red
- Weighs 50+ lbs.
Have you grown Black Diamond watermelons? If so, tell us your top tips for ensuring a delicious harvest.