Amsonia hubrichtii Narrow Leaf Blue Star Description Clusters of sky blue flowers in spring. The narrow, thread-like foliage remains attractive throughout the season and turns a stunning golden color in the fall. Prefers light shade but will take full sun with sufficient moisture. Wonderful texture. Characteristics Hardiness Zone: 4-9 Light requirements: Sun/Part Sun Height: 36" Native: Yes Sizes & Prices Size: 1 GALLON $13.98 Other Information All Blue Star Thread-leaf Blue Star Amsonia 'Blue Ice' Zone: 5 Sun/Part Sun HT: 12-15" Narrow Leaf Blue Star Amsonia hubrichtii Zone: 4-9 Sun/Part Sun HT: 36" Eastern Blue Star Amsonia tabernaemontana var. salicifolia Zone: 3-9 Sun/Part Sun HT: 24-35"