Collinsonia canadensis L.
Richweed, Stoneroot, Citronella Horsebalm
Lamiaceae (Mint Family)
USDA Symbol: coca4
A coarse perennial, up to 5 ft. tall, with large, oval, toothed leaves to the top of the stalk, and long, branched, terminal spikes of small, yellow flowers which stand above the leaves. The lower lip of each flower is fringed and extends beyond the upper lip. These flowers have a distinct lemony odor.
This tall wildflower is typical of moist woodlands. Its foliage as well as its flowers have a citronella-like odor. Tea can be brewed from the leaves, and the rhizome was formerly used as a diuretic, tonic, and astringent.
From the Image Gallery
Plant CharacteristicsDuration: Perennial
Size Notes: Up to about 5 feet tall.
Bloom InformationBloom Color: White , Yellow
Bloom Time: Jul , Aug , Sep
DistributionUSA: AL , 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
Native Distribution: FL to MO, n. to NH, Ont. & c. IL
Native Habitat: Moist, rich, rocky woods
Growing ConditionsLight Requirement: Part Shade
Soil pH: Circumneutral (pH 6.8-7.2)
Soil Description: Humus-rich soil.
Conditions Comments: Easy to care for and pest free. Benefits from wintercover. Foliage is sensitive to frost.
National Wetland Indicator Status
From the National Organizations DirectoryAccording to the species list provided by Affiliate Organizations, this plant is on display at the following locations:
Mt. Cuba Center - Hockessin, DE
Web ReferenceWebref 57 - Atlas of Florida Plants (2020) Institute for Systematic Botany
Webref 23 - Southwest Environmental Information Network (2009) SEINet - Arizona Chapter
Additional resourcesUSDA: Find Collinsonia canadensis in USDA Plants
FNA: Find Collinsonia canadensis in the Flora of North America (if available)
Google: Search Google for Collinsonia canadensis
MetadataRecord Modified: 2022-12-09
Research By: TWC Staff