FruitWatermelon
Greybelle Watermelon
Greybelle Watermelon is a seeded picnic variety that traces its lineage back to 1963, when USDA researchers crossed Sugar Baby and Charleston Grey to create a heat-loving, drought-tolerant melon suited to diverse growing regions. These round fruits reach 15 to 20 pounds and mature in 80 to 90 days, thriving in full sun across hardiness zones 3 through 13. The variety stands out for its resistance to Fusarium Wilt and Anthracnose, plus its ability to shrug off sunburn, making it reliable even in challenging seasons.
Photo © True Leaf Market
Growing Conditions
USDA Zone
3-13
Sunlight
Full Sun
Water
High
Soil
Well-drained, Sandy Loam, Fertile
Growth Stats
18 in
Height
TypeVining
Spacing
36
Plant Profile
Sunlight
Full Sun
Water
High
Zones
3-13
Size
18in H x ?in W
Growth
—
Care
High
Hover over chart points for details
Highlights
Bred by the USDA in 1963 from two legendary watermelon parents, Greybelle delivers the heat tolerance and drought resilience that home gardeners depend on when summers turn harsh. The round, 15 to 20 pound fruits are the classic picnic size, easy to handle and store, while the open-pollinated, heirloom genetics mean you can save seeds year after year. Its resistance to both Fusarium Wilt and Anthracnose 1, paired with sunburn tolerance, removes two major headaches from watermelon growing.
Common Uses
Greybelle watermelon is a picnic melon through and through. The 15 to 20 pound round fruits are sized perfectly for slicing at outdoor gatherings, serving a family of four to six, and fitting comfortably in a cooler. The seeded flesh is traditional watermelon eating, perfect for spitting contests with children or for those who enjoy the nutty flavor complexity that seeds provide.
Growing Timeline
No timeline data available yet for this variety.
Care Instructions
Start Indoors
Start seeds indoors 3 to 4 weeks before your last spring frost, sowing in warm soil (70 to 80°F) at a depth of 1 inch. Keep soil consistently moist but not waterlogged. Transplant seedlings into larger containers once they develop true leaves and harden them off over 7 to 10 days before moving to the garden.
Transplant Outdoors
Transplant seedlings outdoors after all danger of frost has passed and soil temperature reaches at least 65°F, ideally 70°F or warmer. Greybelle thrives in warm conditions, so waiting for consistently warm soil is worth the patience. Space plants 36 inches apart in full sun, handling seedlings gently to minimize root disturbance.
Direct Sow
Direct sow seeds in the garden once soil has warmed to 70°F or above, planting 1 inch deep at 36 inch spacing. Thin seedlings to single plants once they develop true leaves. Direct sowing works well in zones 7 and warmer where spring soil warms quickly.
Harvesting
Greybelle melons mature in 80 to 90 days from transplanting. Harvest when the melon is fully ripe, which you can assess by checking that the ground spot has turned creamy yellow (the underside where the melon rested on soil), the rind resists fingernail pressure, and the melon feels heavy for its size. The fruit should slip easily from the vine when ripe. Cut the melon from the vine with pruning shears or a sharp knife, leaving a short stub of stem behind.
Growing Calendar
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Companion Planting
Pests & Diseases
Ecology & Traits
Edible
Scientific Classification
Citrullus lanatus
Family
Cucurbitaceae
Genus
Citrullus
Growth Habit
Vining
Native Status
L48 (I)PR (I)
History & Origin
“Greybelle emerged from deliberate breeding work at the USDA in 1963, where researchers crossed two Southern watermelon icons: Sugar Baby, known for compact vines and early maturity, and Charleston Grey, prized for vigor and productivity. This cross created a variety that inherited the practical growth habits and disease resistance of its parents while developing its own identity as a heat and drought-tolerant melon. The resulting variety has remained open-pollinated and heirloom, allowing home gardeners to become seed savers themselves rather than relying on commercial seed companies year after year.”