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Collinsonia canadensis

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Plant types and subtypes: Perennials

Light Requirements: part-sun, part-shade

Water Use: medium

Soil Moisture: dry, moist

Soil Description: neutral, rich, clay, sand

Height: 2'-4'

Bloom Time: July, August, September

Bloom Color: yellow

Leaf Color: green

Hardiness Zone: 5, 6, 7, 8

Additional Tags: colonizing, fragrant flowers, fragrant plant, medicinal, naturalizing, shade garden plant, woodland plant

Collinsonia canadensis (richweed)
  • Collinsonia canadensis (richweed)
  • Collinsonia canadensis (richweed)
  • Collinsonia canadensis (richweed)
  • Collinsonia canadensis (richweed)

Pricing & Availability

Description

Collinsonia canadensis

Also known as:

richweed

,

Canada horse-balm

,

horse balm

,

citronella horsebalm

,

stoneroot

Scientific Synonyms:

Description

As with other members of the Mint family, the stems of Collinsonia canadensis are square. This is a tall species that can grow to 4' or more. The leaves are large: 4" to 8", oval and finely toothed. The small terminal flowers are yellow, which is an unusual color for the Mint family. The flowers, and crushed leaves, are fragrant and exude an aroma similar to citronella.

Cultivation

Collinsonia canadensis does best in open shade or filtered light. The soil should be rich and well-drained. It is tolerant of sand and clay, and is reasonably drought resistant. This species is low maintenance, will colonies primarily via rhizomes and is less aggressive than other mints. The foliage is frost tender. Will bloom in July to September. Zones 5-8

Propagation

Propagate by division in early spring.

Additional Notes

The leaves can be brewed and used in teas. The roots have been used in traditional medicine as a diuretic, and in the treatment of of kidney and urinary ailments.

Native Range & Classification

Recorded County Distribution: USDA data

Native Range:
AL, AR, CT, DC, DE, FL, GA, IL, IN, KY, LA, MA, MD, MI, MO, MS, NC, NH, NJ, NY, OH, PA, RI, SC, TN, VA, VT, WI, WV

USDA Endangered Status:

  • Endangered: WI

Classification

Kingdom Plantae Plants
Subkingdom Tracheobionta Vascular plants
Superdivision Spermatophyta Seed plants
Division Magnoliophyta Flowering plants
Class Magnoliopsida Dicotyledons
Subclass Asteridae
Order Lamiales
Family Lamiaceae Mint family
Genus Collinsonia horsebalm
Species Collinsonia canadensis richweed