- You will get 50 Seeds of Giant Titan Sunflower Flower Seeds. - Genus: Helianthus. - 50 Giant Titan Sunflower Seeds Huge 24 inch Heads Big Fat Seeds. - Massive, record-setting flower heads have reached a fantastic 24 inches. One of the largest you can grow, it also produces lots of really big fat seeds. 12 Ft or more Tall!. - What a great addition to the garden! Huge blooms and towering heights! The center of the flower has fascinating patterns that make it hard to look away.