- You will get 20 Seeds of Giant Mongolian Sunflower Non-GMO Flower Seeds. - Genus: Helianthus. - 20 Giant Mongolian Sunflower Seeds Non-GMO. - Enormous sunflower variety, with vibrant yellow flower heads that can get as large as 18 inches across and heights up to 14 feet!. - Comb Flower Mongolian Giant, Golden Flower Of Peru Mongolian Giant, St Bartholomew's Star Mongolian Giant.