Watermelon: Sow and Grow GuideUpdated 14 days ago
Watermelons are warm-season fruits that require plenty of space, sun, and warmth to thrive. Here's a concise guide to successfully sowing and growing watermelons.
When to Sow
Watermelons should be sown outdoors after the last frost when the soil has warmed to at least 70°F. In cooler climates, start seeds indoors 4-6 weeks before the last frost and transplant them when temperatures are consistently warm.
Outdoor Sowing
Choose a sunny location with well-drained, fertile soil. Sow seeds 1/2 inch deep, spacing them 4-6 feet apart in rows or hills. Water gently after sowing and keep the soil consistently moist until germination, which typically occurs in 5-10 days.
Indoor Sowing
For indoor sowing, use biodegradable pots to avoid root disturbance when transplanting. Sow seeds 1/2 inch deep in a seed-starting mix. Keep the soil moist and warm, ideally between 80-85°F. Transplant seedlings when they have two sets of true leaves and outdoor conditions are favorable.
Care and Maintenance
Watermelons need full sun and regular watering, particularly during flowering and fruiting stages. Avoid overhead watering to prevent fungal diseases. Mulch around plants to retain moisture and suppress weeds. Fertilize with a balanced fertilizer when vines begin to run and again when fruit starts to set.
Pests and Diseases
Common pests include aphids, cucumber beetles, and squash bugs. Use row covers to protect young plants and consider insecticidal soap for infestations. Watermelons can also be prone to powdery mildew and fusarium wilt, so ensure good air circulation and avoid overwatering.
Harvesting
Harvest watermelons when the tendril nearest the fruit dries out, the spot where the melon rests on the ground turns yellow, and the fruit gives a deep sound when tapped. Cut the fruit from the vine with a sharp knife or pruners.
Garden Use
Watermelons are best suited for large garden spaces or raised beds due to their sprawling vines. They are also excellent companion plants for corn and sunflowers, which can provide some shade to the fruit.
For further details, visit the full guide on the Botanical Interests Blog.