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 well-established companion pairings, and nothing it needs to be kept away from. 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.
Mature height: 2-3 ft
Method: Direct sow: Direct-sow outside. It doesn't transplant well, or doesn't need the extra time indoors.
When to plant horseradish, by zone
Every zone horseradish grows in. Pick your zone in the header and it will be highlighted here. Each zone links to its full page.
| Zone | Start indoors | Sow or plant out | Harvest |
|---|---|---|---|
| 3a & 3b | Not usually | Jun 6–Jun 13 | Dec 3–Dec 10 |
| 4a & 4b | Not usually | May 22–May 29 | Nov 18–Nov 25 |
| 5a & 5b | Not usually | May 17–May 24 | Nov 13–Nov 20 |
| 6a & 6b | Not usually | May 2–May 9 | Oct 29–Nov 5 |
| 7a & 7b | Not usually | Apr 17–Apr 24 | Oct 14–Oct 21 |
| 8a & 8b | Not usually | Apr 1–Apr 8 | Sep 28–Oct 5 |
| 9a & 9b | Not usually | Feb 22–Mar 1 | Aug 21–Aug 28 |
Harvest dates are about 180 days after the sow or plant-out date.
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.
Good companions for horseradish
- Potato: The most commonly repeated potato companion, credited with deterring the Colorado potato beetle. As with the claim that marigolds deter potato beetles, no extension or research source was found testing horseradish against this specific pest: treat it as garden tradition, not measured evidence.
Full companion guide, including what to keep away from horseradish →
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)
Why each variety is listed comes from the source shown next to it. We haven't grown these ourselves yet, so treat this as a research-backed starting point, not a personal endorsement. The buy links are separate from those sources: they go to seed suppliers that sell that exact variety, and we may earn a commission on some of them.
Where to buy horseradish seeds
None of the seed suppliers we list carries horseradish seeds right now. A local garden center or a specialty seed house is the place to look.
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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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