The Florida Giant Watermelon (Citrullus lanatus), also known as Cannon Ball or Black Diamond, is a legendary heirloom variety famous for producing massive, sweet, and juicy red-fleshed melons. Its smooth, dark-green rind and rich flavor make it a favorite among home gardeners and fruit lovers alike.
This robust variety thrives in sunny, warm regions and performs exceptionally well in nutrient-rich soil. The large vines produce high yields of extra-large fruit perfect for picnics, desserts, and refreshing summer treats.
Ideal for anyone looking to grow classic, non-GMO, garden-fresh watermelons, this variety combines excellent flavor, size, and garden performance.
Features
- Heirloom Variety: Trusted, time-tested Southern classic.
- Giant Fruit Size: Produces huge melons—up to 50–80 lbs under ideal conditions.
- Sweet & Juicy Flesh: Deep red interior with rich watermelon flavor.
- Tough Rind: Resists cracking and ships well.
- Non-GMO & Untreated Seeds: 100% natural, high germination rate.
Specifications
- Common Name: Florida Giant Watermelon
- Scientific Name: Citrullus lanatus
- Also Known As: Cannon Ball, Black Diamond
- Plant Type: Annual vining fruit plant
- USDA Zones: 3 – 11 (warm-season crop)
- Mature Height: 1 – 2 ft vine height, 10 – 15 ft spread
- Light Requirements: Full sun
- Soil Type: Sandy loam, well-draining, nutrient-rich soil
- Soil pH: 6.0 – 6.8
- Watering: Regular watering; keep soil moist but not waterlogged
- Temperature Range: 70 – 95 °F (21 – 35 °C)
- Days to Germination: 7 – 10 days
- Days to Maturity: 85 – 95 days
- Fruit Size: 30 – 80 lbs (varies with growing conditions)
- Fruit Color: Dark green rind with deep red flesh
- GMO Status: Non-GMO
- Season: Late spring to summer
Planting Guide
- Soil Preparation: Enrich with compost or organic fertilizer before planting.
- Sow Depth: ½ – 1 inch deep in warm soil (70 °F minimum).
- Spacing: 3 – 4 ft between plants, 6 – 8 ft between rows.
- Light: Full sunlight for at least 8 hours daily.
- Watering: Deeply and regularly; reduce slightly as fruit matures.
- Harvest: When tendrils nearest the fruit turn brown and rind color dulls.
