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Cobb Gem Watermelon Seeds

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90 days. Citrullus lanatus. Open Pollinated. Cobb Gem Watermelon. The plant produces heavy yields of huge watermelons as large as 150 pounds. It has very sweet and juicy red flesh. The rind is striped and resistant to bruising. Impress your neighbors by growing a Giant Watermelon in your backyard. An excellent choice for home gardens. United States Department of Agriculture, NSL 8709. A 1880s heirloom variety from the USA.

SKU: WM88-10

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Country Of Origin: USA USA

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Availability: Out of stock

Expected availability date: August 21, 2026

Price: $5.00

Your price: $4.50

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90 days. Citrullus lanatus. Open Pollinated. Cobb Gem Watermelon. The plant produces heavy yields of huge watermelons weighing up to 150 pounds. It is a classic American heirloom watermelon prized by home gardeners for its massive size, productivity, and sweet flavor. It has very sweet and juicy red flesh. The rind is striped and resistant to bruising. Impress your neighbors by growing a Giant Watermelon in your backyard. An excellent choice for home gardens. United States Department of Agriculture, NSL 8709. A 1880s heirloom variety from the USA.

Lot No: 101316

Germination: 85%

Seeds Per Pound: 4,000

Plant Height: Vine Type Plant

Planting Season: Spring

Sunlight Requirement: Full Sun

Planting Method: Indoor Sow/Direct Sow

Watermelon Citrullus lanatus

Seed Depth

Soil Temp. for Germination

Days to Germination

Sunlight Requirements

Planting Time

1 - 3"

75 F to 85 F

7 to 14 days

Full Sun

Spring

USDA Hardiness Zone

Seed Spacing

Row Spacing

Space After Thinning

Days to Harvest

N/A

Hills 8 ft Apart

8 ft

Hills 8 ft Apart

70 - 110 days

Watermelon Planting Information:

Watermelons require a lot of space and a sunny location in your garden. Plant 5 to 7 seeds in a diameter outdoors in hills. Planting should occur 1 to 2 weeks after the last frost. Plants grow 1 ft tall, and vines spread up to 6 ft.

Soil Requirements:

Requires fertile soil in a well-drained location in the garden. Apply mulch, grass clippings, or straw around the base of the plant. Add well-rotted manure and compost to the soil.

Water Requirements:

Water well during dry and hot spells. Make sure plants get 1" of water per week.

Fertilizer Requirements:

Use Slow Release (6 Month) Fertilizer when transplanting outdoors. Apply Miracle-Gro Liquid Fertilizer every two weeks.

Harvest Tips:

Protect ripening watermelons from damp ground by placing them on boards. Tap the watermelon with your knuckles, and if it sounds hollow, it's ready. Cut watermelons carefully from the plants to prevent damaging the vines.

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Reimer seeds has over 5,000 quality vegetable, flower, and herb seeds for the home gardener and market growers. We do not sell any Genetically Modified seeds. This year we reduced our prices on many items, added new items, and have added additional bulk items by the ounce and pounds! Take time to review our impressive Online Seed Catalog. Sorry, we do not have a printed catalog to mail you. Plan your garden, and then order your varieties for this upcoming season. Please check back often, as we add new items regularly. If you don’t see an item you want you can always email us and we’ll see if we can bring it into stock!