Amsonia hubrichtii

threadleaf blue star

Hubricht's amsonia

Arkansas amsonia

  • © Richie Steffen / Great Plant Picks

  • © Richie Steffen / Great Plant Picks

Outstanding Qualities

In late spring and early summer a constellation of powdery sky-blue flowers burst forth atop the fine feathery foliage of Amsonia hubrichtii. Thread-leaf bluestar has thin, light green needle-like foliage. As these long-lived and reliable plants mature in midsummer they give the impression of billowing clouds melding with the surrounding landscape. One of the best perennials for fall color, it shines with a radiant bright yellow color before going dormant for the winter.

Quick Facts

Plant Type: perennial

Foliage Type: deciduous

Plant Height: 3 ft. 0 in. (0.91 meters)

Plant Width/Spread: 3 ft. 0 in. (0.91 meters)

Hardiness: USDA Zones 5 to 8

Flower Color: blue

Sun/Light Exposure: full sun

Water Requirements: regular watering

Seasonal Interest: late spring - early summer flowers; autumn foliage color

Wildlife Associations: bees, butterflies

Resistant to: deer

Colors & Combos

Great Plant Combinations: Miscanthus sinensis ‘Variegatus’, Heptacodium miconioides, Geranium ‘Ann Folkard’, Aster divaricatus, Campanula lactiflora ‘Prichard’s Variety’

Great Color Contrasts: yellow, white

Great Color Partners: blue, green, pink, purple

Culture Notes
This long lived perennial prefers a rich well-drained soil and regular summer watering. Plant it in full sun for the best flowering and brightest fall color. Be patient with new young plants, often they can look a little straggly and forlorn and may take a few years to fill out. To help plants establish give them some space to minimize competition. Once they mature they will be long lived and robust, full specimens.
Geek Notes
Amsonia hubrichtii is native to central Arkansas in the Ouachita Mountains. It was first discovered in the 1940's by American biologist Leslie Hubricht (1903-2005) and was named in his honor. Although similar in appearance to Amsonia ciliata, the foliage of A. hubrichtii is narrower and thread-like - hence one of the common names - and the leaves lack the fine hairs of A. ciliata.