Bright daisy-flowered annual in almost every colour, holding well as a cut flower and feeding bees and butterflies through high summer.
Hardiness ratings
| System | Rating | Temperature range | How to read it |
|---|---|---|---|
| USDA hardiness zone | Zone 2–11 | −45.6 °C to 10 °C | Zones where it can be grown as an annual — not a frost-tolerance rating |
| RHS hardiness rating | H2 | 1 °C to 5 °C | Plant needs at least this level of cold tolerance |
| Canadian plant hardiness zone | Zone 2–9 | −40 °C and warmer | Zones where it can be grown as an annual — not a frost-tolerance rating |
| Australian (ANBG) zone | Zone 1–7 | −15 °C and warmer | Zones where it can be grown as an annual — not a frost-tolerance rating |
As a tender annual, Zinnia doesn't overwinter — the zone range shows where the growing season supports it. See the RHS rating for its actual cold tolerance.
Growing notes
- Excellent forage for bees and a top butterfly nectar plant in warm climates
- Long flowering season — pinch out tips to encourage branching
- Choose single or semi-double varieties for pollinator value — fully double forms hide the disc florets and lock pollinators out
Categories
Related plants
Cross-check Zinnia against your zones