Florida Giant Watermelon Seeds. Non-GMO, annual, open-pollinated, heirloom, heat tolerant, seeded, giant watermelon. The Florida Giant watermelon, AKA: Cannon Ball Watermelon, was developed in the 1940s in Florida by Melville Dillon. Buy Seeds Online,Organic Seeds,Heirloom Seeds,Non-GMO Seeds,Vegetable Seeds,Flower Seeds,Herb Seeds,Fruit Seeds,Garden Seeds,Seed Starter Kits,Rare Seeds,Bulk Seeds,Indoor Gardening Seeds,Seed Catalog,Seed Packs for Sale,Sustainable Seeds,Greenhouse Seeds,Seed Suppliers,Planting Seeds,Home Garden Seeds