Come! Ms. Dunlap will give two talks at the CNPS Conservation Conference Feb. 1-3 in LA!

One regarding a database of 3,700 nectar plants (& how to collect images to benefit pollinators), and the other regarding
a prototypical key incorporating a novel plant identification system that produced an order of magnitude improvement.

Armoracia rusticana

Family: Brassicaceae

Common name: HORSERADISH


Type: perennial

Forms: clumping, erect, spreading, tufted

Max height: 2.3 feet

Max width: 2.75 feet


white/off white




Attracts wildlife: adult butterfly, specific butterfly species

Plant features: naturalizes

Edible: herb

Exposure: part shade, sun

Propagates by: division, seed

flowers in spring

Soil type: well drained

USDA Zones: zone 5 to -20 f, zone 6 to -10 f, zone 7 to 0 f, zone 8 to +10 f, zone 9 to +20 f

Temp. range: -20 to +30 °F

Water: moist, regular

Butterflies that feed on this plant

  • Armoracia rusticana 4
  • Armoracia rusticana 6
  • Armoracia rusticana
  • Armoracia rusticana 2
  • Armoracia rusticana 32

Armoracia rusticana, or HORSERADISH, is an edible perennial and a member of the Brassicaceae family. It grows to 2½ feet tall in Zones 5-9, will naturalize, and prefers regular watering. It is a butterfly plant that will grow in part shade. It will likely survive in a container - dividing on occasion to propagate or give a clump to a friend may enable it to continuously naturalize in the pot.

Numerus butterflies feed on plants in the Brassicaceae family.
Butterflies that feed on HORSERADISH in particular include Anthocharis stella, Stella Orangetip, Euchloe hyantis, California Marble, and Euchloe lotta, Desert Marble.

Euchloe hyantis