When to Plant Horseradish

Plant horseradish root cuttings as early as 2 to 6 weeks before the last frost in spring. Horseradish grows best in cool soil, about 40° to 75° (4°-24°C). Set horseradish plants in the garden after the last frost.

Horseradish is cultivated for its pungent flavor. The root is often added to relishes or used dry as a powdered seasoning.

Horseradish is a perennial plant best grown as an annual. Horseradish roots are usually tough and fibrous the second year and not as flavorful as those newly grown.

Growing horseradish as an annual

Horseradish has a spreading habit and can become a weed if left unchecked; the roots spread underground. The best method to keep horseradish under control is to dig it up every autumn; this will keep the roots from spreading. Plants started anew from root cuttings each spring will be more flavorful than those that remain in the garden year after year.

Planting horseradish

Start horseradish early in spring. Plant root cuttings or “thongs” that are about 8 inches (20cm) long. Make holes for each root section by pushing a dibble into the soil at an angle of 45 degrees. Push the thinner end of the root into the soil first; cover the root with 2 to 3 inches (5-7.5cm) of soil.

Plant horseradish in humus-rich, well-turned soil; this will permit easy digging of roots at harvest.

Lift all of the roots in autumn before the first freeze. The smaller roots “thongs” can be stored in sand through winter for planting in a new bed in spring. Store the larger roots for use as needed.

Horseradish planting dates

(These dates are for the Northern Hemisphere)

Average date of the last frost	Planting dates
Jan. 30	Late summer plant
Feb. 8	Late summer plant
Feb. 18	Jan. 15-Feb. 1
Feb. 28	Jan. 15-Feb. 15
Mar. 10	Jan. 15-Mar. 1
Mar. 20	Feb. 15-Mar. 15
Mar. 30	Mar. 1-Apr. 10
Apr. 10	Mar. 10-Apr. 10
Apr. 20	Mar. 20- Apr. 20
Apr. 30	Apr. 1-May 1
May 10	Apr. 15-May 15
May 20	May 1-20
May 30	May 10-June 1
June 10	May 20-June 10