Low silvery-grey prairie shrub with deep purple flower spikes contrasting against the foliage. A cornerstone plant of North American prairie restoration.
Hardiness ratings
| System | Rating | Temperature range | How to read it |
|---|---|---|---|
| USDA hardiness zone | Zone 2–9 | −45.6 °C to −1.1 °C | Plant tolerates down to this zone |
| RHS hardiness rating | H7 | down to −20 °C | Plant needs at least this level of cold tolerance |
| Canadian plant hardiness zone | Zone 2–9 | −40 °C and warmer | Plant tolerates down to this zone |
| Australian (ANBG) zone | Zone 1–5 | −15 °C to 10 °C | Plant tolerates down to this zone |
Growing notes
- Extremely deep root system — 4 m+ taproot supports drought tolerance and prairie ecology
- Tolerates fire — resprouts from rootstock after burns
- Major host plant for native bees and several butterflies
Categories
Related plants
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