250 MAXIMILIAN (Prairie) SUNFLOWER Helianthus Maximiliani Flower Seeds BLOOM TIME: All Summer HARDINESS ZONE: 4 - 10 (and reseeds itself easily) PLANT HEIGHT: 36 - 96" . . . PLANT SPACING: 18 - 24" LIGHT REQUIREMENTS: Sun - Part Shade . . . SOIL / WATER: Average The flowers of the Maximilian Sunflower measure 3 inches wide and cover its branched stems with tons of blooms for maximum color. Unlike a lot of varieties of sunflowers, it is a perennial. It attracts bees, butterflies, and birds.