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 Amsonia Amsonia 'Blue Ice' Thread-leaf Blue Star Zone: 5 Sun/Part Sun HT: 12-15" Amsonia hubrichtii Narrow Leaf Blue Star Zone: 4-9 Sun/Part Sun HT: 36" Amsonia tabernaemontana var. salicifolia Eastern Blue Star Zone: 3-9 Sun/Part Sun HT: 24-35"