Tall airy South American perennial with sparse wiry stems carrying small clusters of bright lilac-purple flowers. Sees-through quality lets it dominate borders without blocking the view.
Hardiness ratings
| System | Rating | Temperature range | How to read it |
|---|---|---|---|
| USDA hardiness zone | Zone 7–11 | −17.8 °C to 10 °C | Plant tolerates down to this zone |
| RHS hardiness rating | H4 | −10 °C to −5 °C | Plant needs at least this level of cold tolerance |
| Canadian plant hardiness zone | Zone 7–9 | −12 °C and warmer | Plant tolerates down to this zone |
| Australian (ANBG) zone | Zone 2–7 | −10 °C and warmer | Plant tolerates down to this zone |
Growing notes
- Peaks from midsummer (July) through autumn — runs from the solstice towards the equinox
- Outstanding butterfly nectar source — the classic plant for attracting painted ladies and brimstones
- Self-seeds freely where summers are warm enough — short-lived in cooler climates but reliably perpetuates
- WARNING: Listed as a weed in parts of Australia (NSW) and the southern US — check local restrictions
Categories
Related plants
Cross-check Purple top vervain against your zones