FruitWatermelon
Charleston Grey Watermelon
Heirloom
Charleston Grey Watermelon is a legendary picnic melon introduced in 1954 by the Southeastern Vegetable Breeding Laboratory in Charleston, South Carolina. These hefty fruits tip the scales at 28, 35 pounds, displaying a distinctive light greenish-grey rind with a cylindrical shape that stretches 22 inches long and 10 inches across. Growing in 80, 89 days, this heat-loving annual thrives across hardiness zones 3, 13 and produces large, seeded melons that have become a classic American summer staple. Its reliable nature and proven anthracnose resistance make it a trusted choice for gardeners who want substantial, rewarding harvests.
Photo © True Leaf Market(https://www.trueleafmarket.com/products/charleston-grey-watermelon-seeds)
Growing Conditions
USDA Zone
3-13
Sunlight
Full Sun
Water
High
Soil
Well-drained, Sandy Loam, Fertile
Preferred Temp75-95°F
Growth Stats
18 in
Height
PeriodAnnual
TypeVine
Spacing
36-48 inches apart
Plant Profile
Sunlight
Full Sun
Water
High
Zones
3-13
Size
18in H x ?in W
Growth
Annual
Care
Moderate
Hover over chart points for details
Highlights
Charleston Grey delivers the genuine article: a full-sized picnic watermelon with real heft and character, not a dwarf novelty. Its light greenish-grey coloring and distinctive cylindrical shape make it instantly recognizable in any garden. Bred specifically for durability and disease resistance over 70 years ago, it remains a benchmark for what a proper watermelon should be. The open-pollinated genetics mean you can save seeds year to year, connecting you to generations of gardeners who've done the same.
Common Uses
Charleston Grey is the quintessential picnic watermelon, bred and refined for slicing, chilling, and serving at outdoor summer gatherings. Its substantial size and full seed count make it ideal for feeding a crowd, and its sturdy rind handles transport and storage without bruising. The open-pollinated genetics also attract seed savers and gardeners interested in preserving heirloom varieties and maintaining genetic diversity in their gardens.
Growing Timeline
First Bloom
Early Summer
First Harvest
Mid-summer
Last Harvest
Late Summer
Care Instructions
Direct Sow
Direct sow Charleston Grey seeds outdoors once soil temperatures reach 70, 85°F and frost danger has completely passed. Plant seeds in mounded hills or raised rows spaced 120 inches apart, with individual plants positioned 36 inches within the row.
Harvesting
Charleston Grey reaches maturity in 80, 89 days from sowing. Harvest when the melon has reached full size (typically 22 inches long and 10 inches across, weighing 28, 35 pounds) and the light greenish-grey rind has deepened slightly in color. The underside should show a creamy yellow or pale spot where it rested on the ground. Cut the melon from the vine with a sharp knife rather than twisting it off, leaving a short stem attached.
Growing Calendar
Enter your ZIP code to see a personalized growing calendar for this plant.
Companion Planting
Pests & Diseases
Ecology & Traits
Edible
Soil pH Range
6 – 7
Scientific Classification
Citrullus lanatus (Thunb.) Matsum. & Nakai var. citroides (L.H. Bailey) Mansf.
Family
Cucurbitaceae
Genus
Citrullus
Duration
Annual
Growth Habit
Vine, Forb/herb
Native Status
L48 (I)PR (I)
History & Origin
“Charleston Grey emerged from intentional breeding work at the Southeastern Vegetable Breeding Laboratory in Charleston, South Carolina, introduced to gardeners in 1954. The variety was developed during a pivotal moment in American agriculture when breeders sought melons that could withstand shipping, storage, and the demands of commercial picnic culture. The light greenish-grey rind became its calling card, distinguishing it from darker varieties of the era. As a open-pollinated heirloom, Charleston Grey represents a moment when seed companies and agricultural scientists worked to create varieties that home gardeners could reliably grow, harvest, and replant year after year.”