When to plant
Plant horseradish roots in early to mid-spring once the soil has warmed and is workable. In mild climates, planting is also possible in early autumn so the roots can establish before winter. Avoid planting in very cold, wet soil.
Where to plant
Choose a sunny or lightly shaded spot with deep, loose soil. Horseradish spreads easily, so plant it where it has space or grow it in a large container to control its vigorous growth.
Preparing the soil
Loosen the soil to 30 cm deep and mix in compost or well-rotted manure. Horseradish prefers fertile, moisture-retentive but free-draining soil. Improve heavy clay with grit and compost; enrich sandy soil with organic matter to help retain moisture.
Preparing the plants
Select firm, healthy root pieces with visible buds. Keep roots slightly moist before planting. If you have angled root cuttings, note which end is the top—the top should face upward when planting.
Planting the root divisions
Plant roots 5–7 cm deep with the top end facing upward. Space plants 30–35 cm apart in rows, or plant individually in deep containers. Backfill carefully and water thoroughly after planting.
After planting
Keep the soil lightly moist while new growth appears. Apply a thin mulch around the plants to conserve moisture and suppress weeds, keeping mulch away from the crown.
During growth
Water during prolonged dry periods. Apply a light top-dressing of compost in spring. Remove unwanted shoots if the plant spreads too much. Horseradish is low-maintenance once established.
After harvest / end of season
Harvest roots in late autumn or early winter when foliage begins to die back. Lift roots carefully with a garden fork. Replant a small piece if you want the plant to regrow next season. Cut back spent foliage at the end of the season.
Extra tips
Horseradish grows vigorously—containers or root barriers help prevent spread. For the strongest flavour, grate roots fresh and use immediately. Plant in a spot where it can stay permanently, as even small root fragments can re-sprout.
