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Watermelon Black Diamond (Citrullus lanatus): Complete Guide to Planting, Growing, and Harvesting

por Dhara Seeds en Oct 30, 2025

About Watermelon Black Diamond (Citrullus lanatus) The Black Diamond Watermelon (Citrullus lanatus) is a classic heirloom variety famous for its dark green to nearly black rind and sweet, juicy red flesh. This large watermelon variety can grow up to 50 pounds (23 kg) or more and is known for its rich flavor, high sugar content, and crisp texture. Originating in the Southern United States, the Black Diamond Watermelon thrives in warm climates and sunny gardens. With proper care, it can yield bountiful fruits that are perfect for summer refreshment, desserts, and juices. You can grow this delicious variety easily with premium seeds from Dharaseeds.com. Why Grow Watermelon Black Diamond? Exceptional sweetness: One of the sweetest heirloom watermelons, with high sugar content and rich flavor. Large fruit size: Produces massive melons, ideal for family gatherings or markets. Classic heirloom: A trusted, old-fashioned variety with decades of cultivation history. Heat-tolerant: Thrives in warm, sunny regions and performs well even in hot summers. High yield: One plant can produce multiple large melons with proper watering and care. When to Plant Watermelon Black Diamond Indoors: Start Black Diamond Watermelon seeds indoors about 3–4 weeks before the last frost date to get a head start. Outdoors: Transplant seedlings or sow seeds directly in the garden once soil temperatures reach 70°F (21°C) and the danger of frost has passed. Best planting time: Spring to early summer, depending on your climate zone. Where to Grow Watermelon Black Diamond Sunlight: Requires full sun for at least 8–10 hours daily to develop sweetness and strong vines. Soil: Prefers well-draining sandy loam enriched with organic compost or manure. Soil pH should be between 6.0 and 7.5. Space: Plant seeds or seedlings 4–6 feet apart in rows spaced 6–8 feet apart, as vines can spread extensively. Climate: Ideal for tropical and subtropical regions. Performs best in hot, dry weather with consistent moisture during fruiting. How to Grow Watermelon Black Diamond Seed Preparation: Soak seeds in warm water for 12–24 hours before planting to improve germination. Planting: Sow seeds 1 inch deep in mounds or raised beds for better drainage. Place 2–3 seeds per hill and thin to the strongest seedling once established. Watering: Keep soil evenly moist during germination and early growth. Once fruits set, reduce watering slightly to enhance sweetness. Fertilization: Apply a balanced fertilizer (10-10-10) at planting, then switch to low-nitrogen fertilizer as fruits begin to develop. Mulching: Use straw or grass mulch to retain moisture, control weeds, and keep melons off the soil. How to Care for Watermelon Black Diamond Watering: Water deeply 1–2 times per week. Avoid overhead watering to reduce disease risk. Pollination: Watermelons rely on bees and insects for pollination, so avoid pesticide use during flowering. Pruning: Limit the number of fruits per vine (2–3 melons) to allow each fruit to reach full size and sweetness. Pest Control: Watch for aphids, cucumber beetles, and squash bugs. Use neem oil or insecticidal soap if needed. Weed Management: Regular weeding and mulching help the vines spread freely without competition. Companion Plants for Watermelon Black Diamond Corn: Provides light shade and helps retain soil moisture. Radish: Acts as a natural pest deterrent against cucumber beetles. Beans: Enrich the soil with nitrogen, supporting strong vine growth. Marigolds: Help repel nematodes and attract pollinators to boost fruit set. Harvesting Watermelon Black Diamond Time to Harvest: Typically 85–95 days after planting, depending on temperature and soil conditions. Signs of Ripeness: The tendril nearest the fruit turns brown and dries out. The underside of the melon changes from white to creamy yellow. The rind becomes dull instead of shiny. When tapped, a ripe melon emits a deep, hollow sound. Harvesting Method: Use a sharp knife or pruning shears to cut the fruit, leaving a 2-inch stem attached. Storage: Store harvested melons in a cool, dry area. Whole melons can last 2–3 weeks at room temperature or longer when refrigerated. Final Thoughts on Watermelon Black Diamond The Watermelon Black Diamond (Citrullus lanatus) is a classic heirloom variety that combines beauty, size, and sweetness. Its deep green rind, bright red flesh, and unbeatable flavor make it a favorite among gardeners and fruit lovers. Whether you’re growing for personal enjoyment, market sales, or family gatherings, this old-fashioned watermelon delivers satisfaction every time. Get premium Black Diamond Watermelon seeds from Dharaseeds.com and enjoy a juicy, homegrown harvest bursting with natural sweetness.