Fast-growing warm-season grain — flowers six to eight weeks from sowing. Exceptional phosphorus scavenger and an outstanding bee plant during its short flowering window.
Hardiness ratings
| System | Rating | Temperature range | How to read it |
|---|---|---|---|
| USDA hardiness zone | Zone 2–10 | −45.6 °C to 4.4 °C | Zones where it can be grown as an annual — not a frost-tolerance rating |
| RHS hardiness rating | H7 | down to −20 °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 1–6 | −15 °C to 15 °C | Zones where it can be grown as an annual — not a frost-tolerance rating |
As a tender annual, Buckwheat doesn't overwinter — the zone range shows where the growing season supports it. See the RHS rating for its actual cold tolerance.
Growing notes
- Phosphorus scavenger — root exudates make unavailable soil phosphorus accessible to following crops
- Frost-tender — sow only after last frost
- Major bee forage when flowering — produces a distinctive dark, strongly-flavoured honey
Categories
Related plants
Cross-check Buckwheat against your zones