A sprawling warm-season vine that rewards patient gardeners with sweet, heavy fruit — best where summers are long and reliably hot.
Citrullus lanatus · also called sugar melon, red melon
Windows are counted from the average date of your last spring frost.
Home-grown watermelons ripen fully on the vine, developing higher sugar content than commercially harvested fruit picked early for shipping. Compact 'icebox' varieties make the crop accessible even in smaller gardens.
A little history. Native to the Kalahari region of southern Africa, where wild relatives still grow. Fruit is botanically a pepo (a berry with a hardened rind derived from an inferior ovary), not a true melon.
Press seeds 1 inch deep and keep soil evenly moist; do not let the surface crust or dry out before sprouts emerge. Seedlings emerge in 4–10 days in warm soil.
Sow seeds 1 inch (25 mm) deep.
Beds strongly preferred; vines need 6–8 feet of run. Containers work only for the smallest icebox varieties in 15-gallon or larger pots. In containers: 15-gallon pot minimum, for compact icebox varieties only. Space plants 84 inches (215 cm) apart.
Deep soak twice a week; reduce to once a week once fruit begins to ripen to concentrate sugars. Water when the top 2 inches of soil feel dry, or leaves show slight midday wilt that does not recover by evening. Aim for about 1–2 inches per week during vine growth.
Side-dress (scatter fertilizer along the row and water in) at planting, again at vine run, then switch formula at first flower. What to use: high-nitrogen fertilizer at planting; switch to low-nitrogen, higher-phosphorus and potassium feed once flowers open.
Pinch off secondary side shoots on compact varieties to direct energy into 2–3 main vines. On standard varieties, pruning is generally not needed and may reduce yield.
It's ready when tendril (the small curling stem) nearest the fruit turns brown and dry; the ground spot (where fruit rests on soil) shifts from white to creamy yellow; thumping produces a deep, hollow sound. Cut the stem with a sharp knife or pruners, leaving 2 inches of stem attached to the fruit. Do not pull or twist — this can tear the vine and damage nearby developing fruit.
Whole fruit keeps 2–3 weeks at 50–60 °F (10–16 °C) in a cool, dry place. Once cut, wrap tightly and refrigerate; use within 3–5 days.
Nasturtium
Nasturtium often pulls aphids onto its own stems and leaf stalks, drawing them away from melon vines. Check the flowers weekly and cut out heavily infested growth, or the colony simply builds next door.
Radish
Radishes sown alongside young melons can absorb some early cucumber beetle feeding on their own leaves. Pull and remove the radishes at harvest rather than letting damaged tops sit in the bed.
Sweet Corn
A row of corn on the windward side breaks drying wind over sprawling melon vines and casts light afternoon shade that eases moisture loss. Keep it well north or west of the patch so the vines still get full sun.
Sunflower
Sunflowers draw in bees, and melons need repeated bee visits to each female flower to set full, evenly shaped fruit. Plant them at the edge of the patch so their roots do not compete with the vines.
Potato
Digging potatoes means turning over soil right where melon vines and their shallow feeder roots are running, and the sprawling vines make it hard to reach the rows. Keep the two crops in separate beds.
Fennel
Fennel roots release substances that stunt most garden vegetables, and young melon seedlings are easily checked. Grown well away in its own corner, its flowers feed hoverflies and tiny parasitic wasps that hunt aphids, so it still earns space.
Give the squash family 2 years away from this spot before any of its relatives return.
The pea and bean family, the carrot family or the onion family thrive in this ground next season.
Watermelon is a heavy feeder that leaves soil hungry and, in a wet year, carrying cucurbit wilt organisms. Keep squash-family crops out of this bed for 2 years. Follow with beans or peas to rebuild nitrogen, then carrots or onions, both of which take the lean soil well.
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