Growing Horseradish: A Complete Profile
By Growing Home Greens Team · August 10, 2026
Horseradish is a perennial root crop grown from root cuttings rather than seed, and once planted, it tends to stay planted; any small piece of root left in the ground resprouts, which is both the plant’s appeal and the reason gardeners give it a spot it won’t outgrow its welcome in.
Planting from root cuttings
Work the soil about a foot deep and mix in compost, manure, or fertilizer before planting. Make a 5 to 6 inch deep furrow and plant root cuttings 12 inches apart, slanted 2 to 3 inches deep with the flat-cut end facing up. Irrigate if the soil is dry.
“Lifting” for a better primary root
For a smoother, larger primary root at harvest, carefully remove secondary or side roots as the crop grows, a practice called lifting; save those side roots for replanting elsewhere. Skip this step entirely if a rougher, wild-root crop is fine.
Harvest after a hard frost
Roots can be dug in late fall once they’re 8 to 10 inches long and 2 to 3 inches in diameter, or in early spring before regrowth starts, digging before the plant leafs out to keep the root’s pungency at its peak. A hard frost sweetens the flavor rather than harming it. Lift carefully with a spading fork to avoid snapping the thick taproot.
Horseradish has no recorded companions or antagonists in our data. See the full companion guide for horseradish for how it’s tracked. Given how persistent it is once established, it’s worth a dedicated, contained spot in the Garden Designer rather than mixed into a bed that gets replanted yearly.
Source: Horseradish: Key Growing Information, Johnny’s Selected Seeds.
Companion planting guide for Horseradish · Find your planting dates
Typically viable in USDA zones 3-9. Not sure your zone? Look it up by ZIP code.
Method: Direct sow: Direct-sow outside. Horseradish doesn't transplant well, or doesn't need the extra time indoors.
See exact start-indoors, direct-sow, and harvest dates for your zone →
How many Horseradish plants fit per square foot?
Spacing: 1 per square foot (square-foot-gardening spacing). Mature height: 2-3 ft.
Varieties worth considering
- Standard horseradish root stock (Armoracia rusticana): Johnny's Selected Seeds sells this as root cuttings rather than named seed cultivars, since horseradish doesn't come true from seed and is propagated vegetatively; the species is what's sold. (source)
Cited from the source shown next to each variety. We haven't grown these ourselves yet, so treat this as a research-backed starting point, not a personal endorsement.
Where to buy horseradish seeds
As an Amazon Associate we earn from qualifying purchases. Some links on this page also go to other retailers we may earn a commission from as an affiliate, at no extra cost to you. We only recommend products with a genuine consensus of positive, independent reviews. See the sources cited on each item.
See it growing
Search YouTube for "growing horseradish" videos → (a live search, not a hand-picked video; results vary and aren't vetted by us)
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Growing Horseradish: A perennial root crop grown from root cuttings rather than seed, planted once and harvested for years since any leftover root piece resprouts.
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