Fast-growing warm-season annual grass that thrives where most cover crops drown. Tolerates wet, waterlogged, and even briefly flooded soils.
Hardiness ratings
| System | Rating | Temperature range | How to read it |
|---|---|---|---|
| USDA hardiness zone | Zone 3–11 | −40 °C to 10 °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 3–9 | −34 °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, Japanese millet doesn't overwinter — the zone range shows where the growing season supports it. See the RHS rating for its actual cold tolerance.
Growing notes
- One of the few cover crops that handles saturated soil — useful where drainage is poor or seasonally wet
- Edible grain — also widely sown for duck and game-bird forage in wetland plots
- Fast biomass producer in warm summers
Categories
Related plants
Cross-check Japanese millet against your zones