FruitWatermelon
Kleckley's Sweet Watermelon
Kleckley's Sweet is an heirloom watermelon that earned its reputation as one of the finest melons for home gardeners. These oblong fruits with square ends weigh 25-40 pounds and develop a thin green rind protecting deep-red flesh so sweet it was once called 'The Wonder Melon.' Ready to harvest in 80-89 days, it thrives in full sun across hardiness zones 3-13 and delivers the kind of authentic, seeded watermelon flavor that made it a picnic staple for generations.
Photo © True Leaf Market
Growing Conditions
USDA Zone
3-13
Sunlight
Full Sun
Water
Moderate
Soil
Well-drained, Sandy Loam, Fertile
Growth Stats
18 in
Height
TypeVining
Spacing
36
Plant Profile
Sunlight
Full Sun
Water
Moderate
Zones
3-13
Size
18in H x ?in W
Growth
—
Care
Moderate
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Highlights
The defining feature of Kleckley's Sweet is its broad, stringless heart of intensely sweet red flesh that justifies decades of praise from home gardeners. This open-pollinated heirloom produces oblong fruits with distinctive square ends and a delicate thin green rind, weighing up to 40 pounds at maturity. Heat tolerance and reliable performance in garden plots make it dependable across a wide range of climates, while the seeded variety ensures robust flavor and heritage seed-saving potential for gardeners who want to save their own seed year after year.
Common Uses
Kleckley's Sweet serves as the classic summertime picnic watermelon, eaten fresh in slices or cut into chunks for gatherings. Its large 25-40 pound fruits and thin rind make it well-suited to serving a crowd, while the sweet red flesh and moderate seed content appeal to those who enjoy traditional, seeded watermelons over seedless varieties.
Growing Timeline
No timeline data available yet for this variety.
Care Instructions
Transplant Outdoors
Transplant seedlings or direct-sown seeds outdoors only after all frost danger has passed and soil temperatures consistently reach 70°F or warmer. Space plants 36 inches apart with 120 inches between rows to accommodate vining growth.
Direct Sow
Direct sow seeds outdoors after the last frost date when soil has warmed to 70-85°F. Plant seeds at the appropriate depth and space plants 36 inches apart with 120 inches between rows.
Harvesting
Harvest Kleckley's Sweet watermelons 80-89 days after planting when fruits reach 25-40 pounds and the thin green rind has deepened in color. Check for ripeness by looking for a creamy yellow patch on the bottom where the melon rested on soil, and listen for a hollow sound when thumped. Cut fruits from the vine rather than pulling them to avoid damaging the plant.
Growing Calendar
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Companion Planting
Ecology & Traits
Edible
Scientific Classification
Citrullus lanatus
Family
Cucurbitaceae
Genus
Citrullus
Growth Habit
Vining
Native Status
L48 (I)PR (I)
History & Origin
“Kleckley's Sweet emerged as a cornerstone heirloom watermelon, earning multiple names that reflected its celebrated status: it was also known as 'Monte Cristo' or simply 'The Wonder Melon.' Seed catalogs of its era touted it as 'The finest and sweetest melon for home use,' a claim that resonated strongly enough to carry the variety through the modern era as an open-pollinated, non-GMO standard. Its journey from those early catalogs to contemporary seed collections reflects how deeply gardeners valued its flavor and reliability for home gardens.”