threadleaf blue star

Threadleaf blue star (Amsonia hubrichtii). This member of the Apocynaceae is native to Oklahoma and Arkansas and was first described in the wild in 1943 from the Ouachita Mountains. Growing in full-sun to partial shade garden conditions, most plants reach 4 ft. tall and 4 ft. wide and form defined clumps and are great to use in mass plantings.

The threadleaf blue star is a real multi-season performer. In spring the narrow, lanceolate leaves emerge as bright green on erect stems. Throughout summer, the feathery textured foliage remains green while plants produce showy, powdery-blue flowers that measure up to 1/2 in. diameter. Come fall, those needle-like green leaves change to a bright yellow-gold color that remains until the plant enters winter dormancy in early winter.


Botanical Name Amsonia hubrichtii
Common Name threadleaf blue star
Family Apocynaceae
USDA Zone 5 thru 8
Light Requirement Full Sun to Part Shade
Season(s) of interest all seasons
Height and Spread 2-3ft x 2-3ft (60-90cm x 60-90cm)
Flower Color Blue
Attracts Wildlife Hosts Caterpillars of Butterflies/Moths, Attracts Pollinators, Rarely Browsed by Mammalian Herbivores
Additional Information Not Native to the US Midwest. Native range: S. Central United States
Location in Lurie Garden Northwest Light Plate, Northeast Light Plate, Southeast Light Plate, Southwest Light Plate


Average Flowering Time