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Black Diamond Watermelon Seeds

Market price: $3.99
Our price: $2.29
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Quantity 5 item(s) available
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Black Diamond (85-95 days)


Heirloom Seed Package contains 2 grams or about 16 seeds

Rumored to have developed around Hope, Arkansas

Black diamond watermelon produces 40# lip licking juicy red melons during the mid season just when you are craving a cool melon the most. 

Bred to have a tough skin and large leaves to prevent sunburn.  This is one drought tolerant melon!  The rind is thick enough to tolerate transport but thin enough to make slicing a breeze. 

1956 Henry Field's Seed Co. seed catalog says about Black Diamond Watermelon...
"(90 days). The big, round, dark green one you find in all markets. May be a little late for northern states, but a dandy from Iowa south. Flesh crisp, very flavorful and sweet."

seed for TexasPerfect for those hot Texas summers.  Especially, in rich sandy soil.  Hempstead, Texas and the surrounding area is famous for Texas size watermelons.  This is one of the best heirloom watermelon seed varieties for Texas. 

Seed Planting Depth

Seeds per gram

Germination Temperature

Days to Germination

Row Spacing

Plant Spacing

100' Row Yield


1" 22-27 75-80 3-10 6' 3' 55 lb Full

Citrullus lanatus

Planting Tips:

In warmer climates, can be direct sown 1” deep once soil is above 75.  For cooler climates, start seedlings 2-3 weeks before last frost and place in final spacing of 3-4ft. on 6 ft. rows.  Loose, fertile soil in full sun will ensure a good crop.  For sweeter melons, reduce watering in the last month before harvest.

If direct seeding, don't plant seed till the soil temperature is 70 degrees or more.  Watermelons are originally from Africa and need heat to grow well.
If you do not have a long hot summer choose an organic variety that is quick to ripen. 
Because we want to get an early start we normally plant watermelon seed in four inch containers inside a greenhouse.

For Best Eating:  Water until the fruits are about the size of a tennis ball then only water if the plant totally dry.  The best tasting organic melons are concentrated in flavor because they are not over-watered.

Seeding Rate: 5,000 plants/acre, aproximately 1/2 lb.

Heirloom seeds are hardy but always take care with your garden seeds to give them the appropriate amount of moisture - not letting the vegetable seeds dry out prematurely or overwatering and possibly having them rot.


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