Iconic eastern North American spring ephemeral with large pure white three-petalled flowers above a whorl of three leaves. Emerges, flowers and goes dormant before the woodland canopy fully closes.
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 4–7 | −29 °C to −7 °C | Plant tolerates down to this zone |
| Australian (ANBG) zone | Zone 1–3 | −15 °C to 0 °C | Plant tolerates down to this zone |
Growing notes
- Flowers April–May, dies back by midsummer once the tree canopy closes overhead — a textbook spring ephemeral
- Slow from seed — wild-dug plants once common in nurseries are now restricted, source only nursery-propagated stock
- Provincial flower of Ontario, Canada
- Needs deep humus-rich woodland soil and full deciduous shade in summer
Categories
Related plants
Cross-check Large white trillium against your zones