To recognize horseradish, look for a basal rosette of long, lance- to oblong-shaped leaves, often 12-24 inches (30-60 cm) long, with wavy or toothed edges and stout leaf stalks.
It grows as a clumping herbaceous perennial with upright flowering stems and small, four-petaled white flowers held in loose clusters above the foliage.
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Use these visible traits to check for Armoracia rusticana.
The overall look is a coarse clump of large leaves topped by airy white flower sprays.
Armoracia rusticana shows useful age-related shifts in leaf form, flowering stems, and overall habit.
In spring, horseradish sends up a fresh rosette of large, bright green basal leaves. These long, wavy-edged leaves are the main visible clue early in the season. Late spring to early summer may bring upright flower stalks with small white four-petaled flowers. After frost, the top growth dies back, and winter usually leaves little above ground beyond a dormant crown.
A few coarse mustard-family plants can be mistaken for horseradish.
broadleaf dock(Rumex obtusifolius)
Both form large basal leaves. Broadleaf dock leaves are broader, with a rounded or heart-shaped base, and the flower stalk carries many small greenish clusters. Horseradish has longer, more tapered leaves and white four-petaled flowers.
greater burdock(Arctium lappa)
Young plants also make big basal leaves. Burdock leaves are softly hairy beneath and soon send up branching stems with round burr-like flower heads. Horseradish leaves are smoother and its flowers are small, white, and held in loose clusters.
Armoracia rusticana is generally considered native to southeastern Europe and western Asia, though its exact original range is uncertain because it has long been cultivated and widely naturalized. In the wild or escaped from cultivation, it is most often found in moist places such as riverbanks, wet meadows, ditches, and field edges. That habitat can help narrow identification when a coarse mustard-family plant is growing in damp, disturbed ground rather than dry grassland or woodland.
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In dormancy, the leafy top dies back and little may remain above ground except a crown at soil level. The thick white taproot stays alive underground and resprouts basal leaves in spring.
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