150 YELLOW VERBASCUM (Common Mullein) Verbascum Thapsus Flower Seeds BLOOM TIME: Mid Summer - Early Fall HARDINESS ZONE: 4 - 10 (Biennial) PLANT HEIGHT: 72 - 84" . . . PLANT SPACING: 24" LIGHT REQUIREMENTS: Sun . . . SOIL / WATER: Average - Dry Attracts bees, butterflies, and birds.