Native pond and stream-margin perennial with sword-shaped leaves and tall stems of bright yellow iris flowers in early summer.
Hardiness ratings
| System | Rating | Temperature range | How to read it |
|---|---|---|---|
| USDA hardiness zone | Zone 4–9 | −34.4 °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 4–8 | −29 °C to −1 °C | Plant tolerates down to this zone |
| Australian (ANBG) zone | Zone 1–6 | −15 °C to 15 °C | Plant tolerates down to this zone |
Growing notes
- Larval food plant for several moth species
- Provides essential vertical structure for emerging dragonfly larvae to climb out of the water and complete their metamorphosis
- WARNING: Invasive in parts of North America and Australia — listed as a noxious weed in several US states and parts of southern Australia, do not plant outside its UK and European native range without checking local regulations
Pet caution: Yellow flag iris is listed as potentially harmful to cats and/or dogs. Keep pets from grazing on it, and contact a vet if you suspect your animal has eaten some.
Categories
Related plants
Cross-check Yellow flag iris against your zones