50 SKYSCRAPER SUNFLOWER Helianthus Annuus Flower Seeds BLOOM TIME: Summer HARDINESS ZONE: Annual PLANT HEIGHT: 144" . . . PLANT SPACING: 18" LIGHT REQUIREMENTS: Sun - Tolerates Heat Well . . . SOIL / WATER: Average - Dry The Skyscraper Sunflower has dark green heart shaped leaves. It tolerates poor soil well. As mentioned, the flowers are a HUGE 14 inches!!! They will provide you with plenty of delicious seeds for roasting. They attract bees, butterflies, and birds.