Tall North American native perennial with broad domed clusters of fragrant flowers in pink, white, lilac or magenta. Peak bloom in midsummer signals high summer in temperate gardens.
Hardiness ratings
| System | Rating | Temperature range | How to read it |
|---|---|---|---|
| USDA hardiness zone | Zone 4–8 | −34.4 °C to −6.7 °C | Plant tolerates down to this zone |
| RHS hardiness rating | H6 | −20 °C to −15 °C | Plant needs at least this level of cold tolerance |
| Canadian plant hardiness zone | Zone 4–8 | −29 °C to −1 °C | Plant tolerates down to this zone |
| Australian (ANBG) zone | Zone 2–5 | −10 °C to 10 °C | Plant tolerates down to this zone |
Growing notes
- Flowers July–August — a textbook midsummer marker in the temperate herbaceous border
- Strongly fragrant on warm summer evenings — pollinated by hawk-moths
- Mildew prone — choose modern resistant cultivars and give good air circulation
- Cut back hard after flowering to encourage strong new basal growth
Categories
Related plants
Cross-check Garden phlox against your zones