Centaurea montana ‘Amethyst in Snow’ Perennial Bachelor's Button Description Bicolor blooms of snow white with royal purple centers dance above handsome mounds of silver-green foliage. Very attractive. Good cut flower. Cut back after blooming in spring to encourage second bloom. Characteristics Hardiness Zone: 3-9 Light requirements: Sun Height: 12-24" Native: No Sizes & Prices Size: 2 Yr $15.98 Other Information All Bachelor's Button, Perennial Perennial Bachelor's Button Centaurea montana Zone: 3-8 Sun HT: 20" Perennial Bachelor's Button Centaurea montana 'Amethyst in Snow' Zone: 3-9 Sun HT: 12-24"