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You are here: Home / Plants / Species Profiles / St. Johnswort
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Species Profiles

St. Johnswort

St. JohnswortScientific name: Hypericum perforatum L. (ITIS)

Common names: St. Johnswort, St. John's wort, common St. Johnswort, Klamath weed, common goatweed, tipton weed

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Selected Resources

Native To: Eurasia and North Africa (Zouhar 2004)

Date of U.S. Introduction: 1700s (Zouhar 2004)

Means of Introduction: Introduced as an ornamental and as a medicinal herb (Klein 2011)

Impacts: Crowds out native species and forage on pasturelands; toxic to livestock (Klein 2011; Zouhar 2004)

Current U.S. Distribution:

Images:

Selected Resources:

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Council

Fact Sheet: St. John's-wort (Jan 2014; PDF | 851 KB)
Alberta Invasive Plants Council (Canada).

Partnership

Invasive Plant Atlas of the United States - Common St. Johnswort
University of Georgia. Center for Invasive Species and Ecosystem Health.

Global Invasive Species Database - Hypericum perforatum (herb)
World Conservation Union. Invasive Species Specialist Group.

Government

Hypericum perforatum L. (Klamath Weed) - Noxious and Nuisance Plant Management Information System (PMIS)
DOD. USACE. Engineer Research and Development Center. Environmental Laboratory.

Hypericum perforatum L. - Germplasm Resources Information Network (GRIN)
USDA. ARS. National Genetic Resources Program.

St. Johnswort
USDA. ARS. Poisonous Plant Research Laboratory.

Hypericum perforatum - Fire Effects Information System (FEIS)
USDA. FS. Rocky Mountain Research Station. Fire Sciences Laboratory.

Ecology and Management of Common St. Johnswort - Invasive Species Technical Note MT-14 (Jul 2007; PDF | 492KB)
USDA. Natural Resources Conservation Service.

PLANTS Database - Common St. Johnswort
USDA. NRCS. National Plant Data Center.

Klamath Weed
DOI. BLM. Arcata Field Office.

St. John's-wort - Guide to Weeds in British Columbia
British Columbia Ministry of Agriculture, Food, and Fisheries (Canada).

St. John's wort - Best Practice Management Guide for Environmental Weeds (PDF | 607 KB)
Cooperative Research Centre for Australian Weed Management.

Weed Profile: St John's wort
New South Wales Department of Primary Industries (Australia).

Pest Plant Risk Assessment - St. John's Wort (Aug 2008; PDF | 211 KB)
Queensland Department of Primary Industries and Fisheries (Australia). Biosecurity Queensland.

State

Common St. Johnswort or Klamathweed - EncycloWeedia
California Department of Food and Agriculture.

Common St. Johnswort Identification and Management (Aug 2009; PDF | 1.18 MB)
Colorado Department of Agriculture. Conservation Services Division.

Class C Noxious Weed: Common St. Johnswort
Washington State Noxious Weed Control Board.

St. Johnswort: Options for Control (PDF | 525 KB)
Lincoln County Noxious Weed Control Board (Washington).

Academic

Common St. Johnswort - Invasive Plant Species of Alaska (PDF | 128 KB)
University of Alaska - Anchorage. Alaska Natural Heritage Program.

Weed Control in Natural Areas in the Western United States: Common St. Johnswort (2013; PDF | 215 KB)
University of California. Weed Research and Information Center.

St. Johnswort: Identification, Biology, and Integrated Management (Aug 2009; PDF | 643 KB)
Montana State University Extension.

St. Johnswort: Identification, Management and Control
University of Nebraska - Lincoln. Cooperative Extension.

Managing Common St. Johnswort (PDF | 332 KB)
University of Nevada - Reno. Cooperative Extension.

Ohio Perennial & Biennial Weed Guide - Common St. Johnswort
Ohio State University. Ohio Agricultural Research and Development Center.

Professional

Hypericum perforatum
Pacific Island Ecosystems at Risk.

St. Johnswort
Montana Weed Control Association.

Citations

Integrated Taxonomic Information System. Hypericum perforatum. [Accessed Mar 22, 2015].

Klein, H. 2011. Common St. Johnswort (PDF | 128 KB) University of Alaska Anchorage. Alaska Exotic Plants Information Clearinghouse.

Zouhar, K. 2004. Hypericum perforatum. In: Fire Effects Information System. U.S. Department of Agriculture, Forest Service, Rocky Mountain Research Station, Fire Sciences Laboratory.

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Last Modified: Apr 17, 2015
 
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