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Grow “Firecracker” Sunflowers from fresh Helianthus annus flower seeds. Firecracker is a hybrid variety of Sunflower that produces 4 to 5 inch, pollen free flowers. This beautiful Sunflower displays bi-colored blooms in yellow & orange and closely resembles the “Ring of Fire” Sunflower. Each plant will stand to a mature height of only 2 to 3 feet tall. The stems may need support until maturity. Once established, they are very strong and will stand upright with no need for stakes or support. Helianthus annus is grown as an annual flowering plant that grows quickly, blooms profusely through the summer months and later dies with the first killing frost.