Tall annual grass producing edible immature ears. Wind-pollinated — plant in blocks, not rows, for proper pollination.
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 | H1c | 5 °C to 10 °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, Sweet corn doesn't overwinter — the zone range shows where the growing season supports it. See the RHS rating for its actual cold tolerance.
Growing notes
- Soil temperature matters more than air — sow only when soil is consistently above 12 °C
- Plant in blocks of 4 × 4 minimum so wind can shake pollen from tassels onto silks
Categories
Related plants
Cross-check Sweet corn against your zones