The genus Armoracia is comprised of three species of erect perennials in the mustard family from a range of habitats in Eurasia and the eastern United States. Coarse basal leaves grow from deep taproots, which may be woody or fleshy. The white flowers are small and cross-shaped and are produced in large panicles or racemes from late spring to late summer.
Noteworthy CharacteristicsThe roots of A. rusticana are used to make horseradish.
CareFull sun in light, fertile, moist but well-drained soil. During active growth, be sure to water freely to prevent roots from becoming woody.
PropagationDivide or take root cuttings in winter.
ProblemsPowdery mildew, downy mildew, leaf spots, black rot, club root, and turnip mosaic. Root rot is a problem in some areas.