Florida Giant Watermelon (Cannon Ball, Black Diamond) Citrullus Fruit Seeds

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.