Amsonia, also known by the common name of blue star, is a herbaceous perennial named for the clusters of pale blue star-like flowers that occur from late spring to early summer. Native to North America, the blue star plant is found growing in moist woodlands, meadows and thickets. Upright clump-forming plants produce dense green foliage that turns golden yellow in fall for multi-season appeal, making amsonia a standout blue star perennial in many landscapes.