Horseradish

Horseradish: plant 45 cm (18 in) apart in the row and 60 cm (24 in) between rows, 1 per square. Good neighbours: Potato.

Key facts

Spacing in the row	45 cm (18 in)
Between rows	60 cm (24 in)
In a 30 cm (1 ft) square	1 per square
Sun	Full sun, 6–8 hours a day
Root depth	40 cm (16 in)
Height when grown	70 cm (28 in)
Crop rotation group	Cabbage family
Support	None needed

Sowing and germination

How it is started	From cuttings
Cuttings per planting hole	3
Planting depth	8 cm (3.1 in)
Soil temperature	from 7 °C, best 16–22 °C
Before sowing	nothing needed
When to plant	Outdoors before the last frost; soil at least 7 °C

From seedling to plant

Takes transplanting	Badly, sow where it grows
Life cycle	Perennial
Cold tolerance	Takes a light frost → hardy, takes hard frost
Soil	Light, sandy, free draining, pH 6–7
In a pot	10 L, 30 cm (11.8 in)
Watering	Water when the soil is dry two fingers down; while roots swell
Feeding	Little; at planting
Support and training	None needed

Harvest and planning

Days to first harvest	200–240 days, from planting
Ready when	After the first frosts, when it sweetens
Harvest window	All at once, 4–8 weeks
Sow again every	21 days
Typical yield	0.4–0.9 kg per plant
Botanical family	Brassicaceae
Watch out for	Flea beetles, clubroot, slugs and snails
First crop after	1–2 years
Pollination	Fruits on its own

Good neighbours

Potato

Why, with the sources →

Plan Horseradish in your garden

Open the free planner, drop Horseradish onto a bed and see how many plants fit.

Start Planning Your Garden

Sowing and harvest

Plant out	Mar–Apr
Harvest	Oct–Nov

My dates for this crop

My country Last spring frost where I live

Give the date once and this page, the sowing calendar and the planner all follow it.

Months for a temperate climate: about a month later in the north and a month earlier in the south. Give your own last frost date for exact dates.

What to plant next to Horseradish →

From the same family

Plants of the Brassicaceae family share diseases and pests, so they follow each other in the rotation only after a break.

Grown much the same way

Crops that need about the same room and care, from another family.

Sources

The values on this page marked as checked come from these sources: spacing, sowing depth, germination, soil, timing and safety notes, each against the source named here.

Home Gardening Series: Horseradish (FSA6087) — University of Arkansas Cooperative Extension for: sowing depth, soil, spacing in the row; checked 2026-10-30
Horseradish in the Garden (2020) — Utah State University Extension for: sowing depth, spacing in the row; checked 2026-10-30
Growing horseradish in home gardens — University of Minnesota Extension for: spacing in the row; checked 2026-10-30

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