Fruit
Black Diamond
B tier
Black Diamond is a large dark-rinded heirloom-style watermelon with red flesh, big black seeds, and a reputation for enormous fruit in Southern gardens. The nearly black-green shell hides a creamy ground spot that signals ripeness better than overall colour. Flavour is traditional sweet watermelon when vine-ripe; huge specimens can be watery if overwatered or underripe. Built for county-fair scale harvests, family reunions, and nostalgic seeded eating. Rind is thick enough for pickling. Not for small fridges—plan to share or process promptly after cutting.
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Characteristics
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Grading systems
Grades are placed along a shared scale so systems can be compared side by side.
History
Black Diamond types spread through Southern US farm and garden watermelon culture.
Dark-rind giant melons labeled Black Diamond dominated many rural stands.
Hybrid competition reduced commercial Black Diamond while home growers persisted.
Heirloom interest returned oversized Black Diamond seed to catalogues.