Threadleaf blue star pairs pale blue spring flowers with fine, feathery foliage that turns bright yellow in autumn.
- Height
- 60–92 cm / 2–3 ft
- Spread
- 60–92 cm / 2–3 ft
- Light
- Full sun / Partial shade
- Soil moisture
- Dry / Moist, well-drained
- Flowering
- Spring
- Foliage
- Deciduous
- Maintenance
- Low
- USDA zones
- 5a–8b
Planting
Use full sun or partial shade and average, well-drained soil. Leave room for a broad clump behind shorter perennials; overly rich soil or deep shade can make the stems flop.
Care
Allow a year or two for the clump to develop. If stems become floppy, cut them back after flowering to improve the plant's shape.
Before planting: Wear gloves when cutting stems: the milky sap can irritate skin.
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Sources & photo credit
Plant reference: NC State Extension Gardener Plant Toolbox. Content checked . Flowering seasons vary with local climate; USDA zones describe winter cold tolerance.
- Threadleaf blue star: Cathy Dewitt · CC BY 4.0. Resized, converted to WebP and cropped for display.
- Downy blue star: Susan Strine · CC BY 2.0. Resized, converted to WebP and cropped for display.
- Eastern bluestar: Susan Strine · CC BY 2.0. Resized, converted to WebP and cropped for display.
- 'Dilys' geranium: Krzysztof Golik · CC BY-SA 4.0. Resized, converted to WebP and cropped for display.