The CAL Sweet Supreme Watermelon (Citrullus lanatus) is a premium, high-sugar variety prized for its large, round melons, bright red flesh, and crisp texture. Known for its exceptional sweetness and smooth, firm rind, this heirloom watermelon seed is perfect for both home gardeners and small-scale growers.
Each non-GMO CAL Sweet Supreme seed produces a vigorous vine yielding 25–35 lb melons with a deep red interior and dark green, faintly striped rind. Resistant to cracking and adaptable to a wide range of climates, it’s a consistent performer known for rich flavor and strong yields.
Key Features
- Produces large 25–35 lb melons with deep red, juicy flesh
- High sugar content and crisp texture for superior taste
- Non-GMO heirloom seed variety
- Adaptable to diverse growing conditions
- Ideal for home gardens, farms, and market growers
Specifications
| Characteristic | Details |
|---|---|
| Common Name | CAL Sweet Supreme Watermelon |
| Scientific Name | Citrullus lanatus |
| Plant Type | Warm-season Annual Vine |
| Growth Habit | Spreading vine, 8–10 feet long |
| Heirloom | Yes |
| GMO Status | Non-GMO |
| Organic | Naturally untreated seed form |
| USDA Hardiness Zones | 4–10 |
| Sunlight Requirement | Full Sun (6–8 hours daily) |
| Soil Type | Loamy, well-drained soil |
| Soil pH | 6.0–7.5 |
| Season | Spring and early summer |
| Watering | Deep, regular watering; reduce at fruit maturity |
| Days to Maturity | 85–95 days |
| Fruit Weight | 25–35 lbs average |
| Fruit Shape | Round to slightly oval with firm rind |
| Spacing | 3–4 feet apart in rows 6–8 feet apart |
| Temperature | Thrives between 75–90°F |
| Pollination | Insect-pollinated; attracts bees |
| Harvest Period | Mid to late summer |
| Maintenance | Moderate; prune vines for airflow and yield consistency |
Planting Guide
- Seed Starting: Sow directly outdoors after soil reaches at least 70°F or start indoors 3 weeks before last frost.
- Planting Depth: Sow seeds 1 inch deep in hills spaced 3–4 feet apart.
- Watering: Keep soil moist during germination, then water deeply once per week. Avoid overwatering near harvest.
- Soil & Sun: Requires full sun and well-drained, nutrient-rich soil.
- Pollination: Encourage bees and pollinators for optimal fruit set.
- Harvesting: Melons are ready when the tendril nearest the fruit dries and the bottom spot turns creamy yellow.