Perennials
Amsonia hubrichtii
Threadleaf bluestar
Also known as: Arkansas amsonia · Hubricht’s amsonia
Fine, feathery foliage forms an upright clump, topped with pale blue spring flowers. Golden fall color extends its interest well beyond bloom. It is adaptable to clay, loam or sand if drainage is good.
At a glance
- Sun
- Full sun to part shade
- Mature size
- 2–3 ft. tall × 2–3 ft. wide
- Water
- Moderate; well-drained soil
- Hardiness
- USDA zones 5–8
- Bloom
- Blue stars in spring.
Sizes & prices
- #1$14.99
Catalog updated September 8, 2026. This is not a live stock count; please call to confirm availability and price.
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Resistance & tolerances
- Deer
- Resistant, not browse-proof.
- Drought
- Tolerates some drought once established.
- Wet soil
- Moist to occasionally dry, with good drainage.
Resistance is not a guarantee; deer and rabbits may browse any plant.
Pollinators & wildlife
- Attracts
- Butterflies
Keep in mind: Milky sap can irritate skin; wear gloves when cutting back.
Seasonal interest
- Foliage
- Fine green leaves turn yellow in fall.
Growing & care
- Establishment
- Slow initially; allow 1–2 years to fill out.
- Growth
- Too much shade or rich soil can cause flopping; trim after flowering if needed.
- Maintenance
- Cut back after flowering if stems become floppy. Wear gloves; the milky sap may irritate skin.
Sources & photo credits
Photo: Derek Ramsey (Ram-Man) · CC BY-SA 2.5
Image notes: Threadleaf bluestar foliage at Tyler Arboretum. species photo; uncropped.
Reviewed September 19, 2026. Growing conditions vary by location.