CULTURE: A light, well-drained soil with a pH of 6.5–7.5 and a southern exposure is ideal. Sow seeds outdoors after last frost is expect and soil temperatures are above 70°F.
SEEDLESS: Triploid (Seedless) watermelon varieties need to be grown with Diploid (Seed) watermelon varieties for fertilization. Sugar Baby is good selection for a diploid fertilizer.
TRANSPLANTING: Sow 2-3 seeds, 1″ deep in a 2″ peat pot 2-4 weeks before last frost date (no sooner!). Germinate at 80°F then reduce to a constant 75°F). Keep well watered until 1 week before placing outdoors. Reduce water and temperature for a week to harden seedlings. Transplant 2–3′ apart in rows 6–8′ apart. Even hardened watermelon seedlings are tender! Do not disturb roots when transplanting, and water thoroughly.
DIRECT SEEDING: Sow 1–2 weeks after last frost when soil is warm, above 70°F, 3 seeds every 18–36″, 1″ deep. Thin to 1 plant per location when seedlings have first true leaves.
RIPENESS/HARVEST: There are 2 good ways to tell when a watermelon is ripe: 1) the tendril nearest the point on the vine where fruit stem attaches is browning/dead. 2) the spot where the fruit rests on the ground is pale yellow. If your able try not to water the fruits 1 week before harvest as overwatering can cause bland fruit.
STORAGE: Hold at 40-50°F and 85% relative humidity 2–3 weeks.
AVG. DIRECT SEEDING RATE: 1 oz./340′, 1,000 seeds/500′, 3 oz./1,000′, 1⅓ lb./acre at 3 seeds every 18″, in rows 6′ apart.