vegetable
brassica family

Horseradish

Armoracia rusticana

Horseradish is a hardy perennial root crop with a fierce, pungent flavour — the essential ingredient in homemade horseradish sauce for roast beef. It's incredibly easy to grow, almost to a fault: it spreads readily from any piece of root left in the soil, so contain it in a deep pot, an old dustbin, or a dedicated corner of the plot you don't mind giving over to it permanently. Plant root cuttings (thongs) in March, 30cm deep with the top just below soil level. The first season focuses on leaf growth; harvest substantial roots from autumn of year two onwards. Lift roots as needed from October to February — flavour is strongest after the first frosts. Grate fresh for the best heat; flavour fades within minutes of grating.

Plan where to grow Horseradish using our vegetable garden planner.

SunlightFull sun
WateringLow
Height1.0m
Spacing60cm
GerminationPlant as root cuttings
Sowing MethodDirect sow
Frost HardinessHardy
Sowing Depth30cm

When to Sow Horseradish

Sow horseradish in March, April.

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Sowing months

Time to Harvest Horseradish

Expect to harvest approximately 18 months after sowing.

Companion Plants

Expected Yield

Established plants yield 1–2kg of roots per crown per year.

Common Problems with Horseradish

Spreading invasively

Any root fragment regrows. Grow in a buried dustbin or large container with the bottom removed, or commit to a permanent corner of the plot. Dig the whole patch annually to control spread.

Forked or stunted roots

Caused by stony, compacted soil. Dig deeply before planting and remove stones. Grow in raised beds or large containers for clean, straight roots.

Loss of flavour after grating

Volatile oils dissipate within 30 minutes of grating. Always grate fresh and use immediately, or preserve by mixing with vinegar straight after grating.

Plan your horseradish in the allotment planner

Drag and drop plants onto your plot and get personalised sowing reminders.

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