Fastest-establishing green manure — germinates in 3–4 days. Glucosinolates released when the green mass is incorporated act as a natural soil biofumigant.
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, White mustard doesn't overwinter — the zone range shows where the growing season supports it. See the RHS rating for its actual cold tolerance.
Growing notes
- Not a nitrogen fixer — its value is establishment speed and biofumigation
- Brassica family — do not precede a brassica food crop (cabbage, broccoli, kale) in rotation; clubroot risk
- Excellent quick cover for vacant beds; terminate before flowering to prevent volunteers
Categories
Related plants
Cross-check White mustard against your zones