How to Grow Horseradish

Growing guide

Overview

Horseradish is a vigorous perennial grown for its pungent taproot, which is far more flavorful when fresh than store-bought. It’s nearly indestructible, thriving in full sun to partial shade and tolerating a range of conditions. Give it loamy, well-drained soil and moderate water, and it will reward you with a harvest in 300–365 days.

Soil & planting prep

Horseradish prefers deep, loamy, well-drained soil with a pH between 6.0 and 7.0. Before planting, loosen the soil to at least 12 inches deep and mix in compost. Space plants 18–24 inches apart, setting root cuttings 3–4 inches deep.

When to plant

Plant horseradish in early spring, as soon as the soil can be worked, which is typically 2–4 weeks before your last frost date. In mild climates (zones 7–9), you can also plant in fall, about 4–6 weeks before the first expected frost. It is frost-tolerant, so don’t worry about a light freeze after planting.

How to plant

1. Choose a permanent spot in full sun to partial shade, or a 10-gallon container to contain its spread.
2. Loosen the soil to 12 inches deep and mix in 2–3 inches of compost.
3. Plant root cuttings (sets) 3–4 inches deep, 18–24 inches apart, burying them on a slight angle with the top end up.
4. Water thoroughly after planting and keep the soil evenly moist until growth appears.
5. Mulch lightly to suppress weeds and retain moisture, but keep mulch away from the crown.

5 common mistakes to avoid

• Planting horseradish in a mixed vegetable bed without a barrier — it spreads aggressively by roots and will take over, so grow it in a dedicated bed or a 10-gallon container.
• Harvesting too early in the season — roots need a full growing season (300–365 days) and a few frosts to develop their full pungency, so wait until late fall.
• Letting the soil dry out completely — horseradish needs moderate, consistent moisture; drought stress makes roots woody and less flavorful.
• Planting in heavy clay or waterlogged soil — this causes root rot and misshapen roots; always ensure good drainage.
• Leaving the plant unharvested for multiple years — roots become tough and overly pungent; dig and replant a few root cuttings each year to keep quality high.

Harvesting & storage

Horseradish is ready to harvest in late fall, about 300–365 days after planting, after a few frosts have sweetened and intensified the roots. Dig carefully around the plant with a fork, lift the main root, and cut off side roots for replanting. Store roots in a plastic bag in the refrigerator for several weeks, or peel and grind them for immediate use.

Companion planting

Horseradish is best grown alone because it inhibits the growth of nearby plants, especially potatoes and tomatoes. If you must interplant, choose a spot away from other vegetables.

Growing in containers

Horseradish grows well in a 10-gallon container, which prevents it from spreading. Use a deep pot with drainage holes, fill it with loamy potting mix, and keep it in full sun to partial shade; water moderately.

Pro tips

Plant root cuttings in spring, burying on a slight angle. Harvest roots in fall after a few frosts for best heat. It spreads — contain it in a pot or dedicated bed.