Watermelon
A sprawling summer vine that rewards patient gardeners with heavy, sweet-fleshed fruit straight from the vine.
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Born in the African Heat
Watermelon traces its roots to the Kalahari Desert of southern Africa, where wild relatives still grow today. Cultivated for at least 5,000 years, it spread through the Mediterranean and reached the Americas by the 17th century, quickly becoming a warm-weather staple worldwide.
Modern varieties range from petite icebox types weighing 6-10 lbs to heirloom giants topping 30 lbs, with flesh that runs red, yellow, or orange. Seedless triploid varieties now dominate commercial production, but many home gardeners prize heirlooms like Crimson Sweet and Sugar Baby for their complex sweetness.
Planting & care
Start seeds indoors 3-4 weeks before your last frost date, or direct-sow into warm soil (at least 70 deg F) after all frost danger has passed. Space transplants 3-5 ft apart in rows 6-8 ft apart - these vines need room to roam. Amend beds with compost and a balanced fertilizer before planting; watermelons are heavy feeders.
Once vines are established, water deeply and consistently. Switch to a low-nitrogen fertilizer once flowering begins to encourage fruit set over foliage. Mulch heavily to retain moisture and suppress weeds. Tuck a piece of cardboard or straw under developing fruit to prevent rot and pest damage on the soil side.
The Thump Test (and When to Actually Trust It)
Harvesting at peak ripeness is the trickiest part. Look for three signs together: the tendril closest to the fruit dries and turns brown, the underside ground spot shifts from white to creamy yellow, and a firm thump produces a deep hollow sound rather than a sharp ping. No single sign is foolproof - use all three.
How much sun does Watermelon need?
Watermelon grows best in full sun.
How often should you water Watermelon?
Give it about 1-2 in per week; reduce as fruit ripens.
When is Watermelon ready to harvest?
Watermelon is usually ready in 70-90 days from transplant depending on variety.