500 SIBERIAN WALLFLOWER Erysimim Cheiranthus Allionii Flower Seeds BLOOM TIME: Spring HARDINESS ZONE: 3 - 9 PLANT HEIGHT: 12 - 18" . . . PLANT SPACING: 9 - 12" LIGHT REQUIREMENTS: Sun - Part Shade . . . SOIL / WATER: Average Fragrant! Attracts butterflies.