Climate matters. This page is a practical baseline. Confirm cultivar, local frost/heat conditions, mature size and regional restrictions before planting.
Horseradish — Growing reference
| Scientific name | Armoracia rusticana |
|---|---|
| Soil temperature for germination (°C) | 7.2–18.3 |
| First harvest or flowering (days) | 150–180 |
| Measured from | Transplant |
| Plant spacing (cm) | 45.7–61 |
| Mature height (cm) | 61–91.4 |
| Mature spread (cm) | 45.7–61 |
| USDA hardiness zones | 3–9 |
| Light | Full sun |
| Water | Moderate |
| Sowing method | Division |
Growing directions
Plant 6–8 in root cuttings (thongs) at a 45-degree angle, 2–3 in deep, in deeply tilled, fertile soil; vertical planting produces rougher roots while angled planting encourages smoother, straight taproots. Horseradish is extremely vigorous and should be contained or given a dedicated bed where spreading is acceptable. Harvest main roots in autumn after the first hard frost triggers maximum heat and oil development. Save pencil-thick side roots to replant as next year's cuttings.
Source and local conditions
Typical planning ranges from OpenPlantDB (CC0). Cultivar, climate, season and growing method can change these values. Confirm the seed label and local guidance before planting.
Source & verification
OpenPlantDB · CC0