Amsonia ‘Storm Cloud’ Blue Star Description In spring, near-black stems emerge, unfurling into very dark green leaves. Periwinkle clusters of star-shaped flowers appear in late spring into early summer. Like its Native parent the foliage turns a beautiful gold in fall and is deer resistant. Characteristics Hardiness Zone: 3-9 Light requirements: Sun/Part Sun Height: 24-36" Native: Yes Sizes & Prices Size: 1 GALLON $16.98 Other Information All Amsonia Amsonia 'Storm Cloud' Blue Star Zone: 3-9 Sun/Part Sun HT: 24-36" Amsonia tabernaemontana var. salicifolia Eastern Blue Star Zone: 3-9 Sun/Part Sun HT: 24-35"