Blue Star, Threadleaf Blue Star, Arkansas Blue StarThreadleaf Blue Star is known for its feathery, thread like leaves that create a soft, billowy texture in the garden. In late spring to early summer, it produces clusters of light blue, star shaped flowers. Then, in the fall, the foliage turns a stunning golden yellow, adding another season of interest. This plant prefers full sun to partial shade and well drained soil. It's also relatively drought tolerant once established, making it a good choice