Collinsonia canadensis - L.
Common Name Stone Root - Horse Balm, Richweed
Family Lamiaceae or Labiatae
USDA hardiness 4-8
Known Hazards Minute doses of the fresh leaves can cause vomiting[222], though the root is well-tolerated by the body[238]. Possible blood pressure elevation [301].
Habitats Rich damp woods[43, 222].
Range Eastern N. America - Ontario and Vermont to Florida, west to Wisconsin.
Edibility Rating  
Other Uses  
Weed Potential No
Medicinal Rating  
Fully Hardy Moist Soil Wet Soil Semi-shade

Translate this page:

You can translate the content of this page by selecting a language in the select box.


Collinsonia canadensis Stone Root - Horse Balm,  Richweed

Collinsonia canadensis Stone Root - Horse Balm,  Richweed
Physical Characteristics
 icon of manicon of flower
Collinsonia canadensis is a PERENNIAL growing to 0.8 m (2ft 7in) by 0.4 m (1ft 4in).
It is hardy to zone (UK) 4. It is in flower in August. The flowers are hermaphrodite (have both male and female organs) and are pollinated by Insects.Suitable for: light (sandy) and medium (loamy) soils. Suitable pH: acid, neutral and basic (alkaline) soils. It can grow in semi-shade (light woodland). It prefers moist or wet soil.

Collinsonia cuneata. Collinsonia decussata. Collinsonia ovalis. Pleuradenia praecox.

Woodland Garden Dappled Shade; Shady Edge; Bog Garden;
Edible Uses
None known
Medicinal Uses

Plants For A Future can not take any responsibility for any adverse effects from the use of plants. Always seek advice from a professional before using a plant medicinally.

Alterative;  Antispasmodic;  Diaphoretic;  Diuretic;  Sedative;  Tonic;  Vasodilator;  Vulnerary.

The whole plant, but especially the fresh root, is alterative, antispasmodic, diaphoretic, diuretic, sedative, tonic, vasodilator and vulnerary[4, 21, 46, 102, 165]. A tea made from the roots is strongly diuretic, it is valuable in the treatment of all complaints of the urinary system and the rectum and is used in the treatment of piles, indigestion, diarrhoea, kidney complaints etc[4, 222]. It has proved of benefit in the treatment of irritable bowel syndrome, mucous colitis and varicose veins[254]. The root is seldom used on its own but is contained in remedies with other herbs, especially Aphanes arvensis, Eupatorium purpureum and Hydrangea arborescens[238]. The roots contain more than 13,000 parts per million of rosmarinic acid, the same anti-oxidant that is found in rosemary[222]. The fresh leaves are strongly emetic[222]. Some caution is advised, see notes above on toxicity[222]. A poultice of the leaves or roots is applied to burns, bruises, sores, sprains etc[4, 222, 254].


Other Uses
None known
Cultivation details
Prefers a sandy peat in a moist situation but it is easily grown in ordinary garden soils[1] so long as they are not dry[200]. Prefers dappled shade[200]. The whole plant has a strong disagreeable odour and a pungent spicy taste[4]. Another report says that the foliage is strongly aromatic, with a lemon scent[238].
Seed - best sown as soon as it is ripe in a cold frame. The seed can also be sown in the spring, though it might be slower to germinate. Prick out the seedlings into individual pots when they are large enough to handle and grow them on in light shade in a greenhouse or cold frame. Plant them out in spring or early summer of their second year. Division in spring[1].
Other Names
Found In
Weed Potential

Right plant wrong place. We are currently updating this section. Please note that a plant may be invasive in one area but may not in your area so it’s worth checking.

Conservation Status
IUCN Red List of Threatened Plants Status :
Related Plants


Print Friendly and PDF
Expert comment
Botanical References
Links / References
For a list of references used on this page please go here
Readers comment
pete jones   Sat May 27 2006
A decent natural cure for hemmoroids!
Fred Gates   Thu Oct 18 2007
Fresh leaves crushed and applied to your body or clothing makes you invisible to biting insects. That is why it is called citronella. Fred Gates
ken   Tue Apr 1 2008
I think it is miraculous cure for hemorrhoids, serious. Even for chronic cases.
Peter   Sun Apr 26 2009
It's great for sinus infections as it positively impacts the entire mucous membrane system (mouth to down there)
QR Code

What's this?

This is a QR code (short for Quick Response) which gives fast-track access to our website pages. QR Codes are barcodes that can be read by mobile phone (smartphone) cameras. This QR Code is unique to this page. All plant pages have their own unique code. For more information about QR Codes click here.

1. Copy and print the QR code to a plant label, poster, book, website, magazines, newspaper etc and even t-shirts.
2. Smartphone users scan the QR Code which automatically takes them to the webpage the QR Code came from.
3. Smartphone users quickly have information on a plant directly for the website on their phone.
Add a comment

If you have important information about this plant that may help other users please add a comment or link below. Only comments or links that are felt to be directly relevant to a plant will be included. If you think a comment/link or information contained on this page is inaccurate or misleading we would welcome your feedback at [email protected]. If you have questions about a plant please use the Forum on this website as we do not have the resources to answer questions ourselves.

* Please note: the comments by website users are not necessarily those held by PFAF and may give misleading or inaccurate information.

To leave a comment please Register or login here All comments need to be approved so will not appear immediately.

Subject : Collinsonia canadensis  

Plant Uses

Edible Uses
Medicinal Uses
Other Plant uses
Woodland Gardening
Why Perennial Plants?
Top Edible Plants
Top Medicinal Plants
Garden Design

Twiter      Facebook


Content Help
Support Us
Old Database Search
About Us

Stay informed about PFAFs progress,
challenges and hopes by signing up for
our free email ePost. You will receive
a range of benefits including:
* Important announcements and news
* Exclusive content not on the website
* Updates on new information &
functionality of the website & database

We will not sell or share your email address.
You can unsubscribe at anytime.