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WeedWise Program A conservation program of the Clackamas County SWCD

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St. John’s Wort

Carol DiSalvo, USDI National Park Service, Bugwood.org

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Latest

Think twice before killing those thistles: Thistle Identification March 21, 2017
Staff Spotlight: Sarah Hamilton, WeedWise Specialist & CWMA Coordinator April 6, 2017
Himalayan Blackberry BMP Now Available January 8, 2015
Tansy Ragwort Poisons Livestock and Neighborly Relationships! July 27, 2016
Blessed Milkthistle invading pasture lands. June 3, 2016

Recently discovered organic herbicide shown to be safe and effective against nearly all invasive weeds! April 1, 2024
April’s Weed of the Month: Garlic Mustard April 1, 2024
March’s Weed of the Month: Canada thistle March 1, 2024
Its National Invasive Species Awareness Week! February 26, 2024
We Are Hiring for Multiple Seasonal Positions! February 21, 2024

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20 Questions Alliaria petiolata armeniacus Best Management Practices Blackberry BMP Christmas cinnabar moth Cirsium arvense Class A Class B Columbia Gorge CWMA CRISP Cytisus scoparius English ivy Fallopia japonica Fallopia sachalinensis Fallopia ×bohemica forest understory Garlic mustard Hedera canariensis Hedera helix Hedera hibernica invasive IPM Irish ivy noxious Polygonum cuspidatum Polygonum sachalinensis Polygonum x bohemicum priority Ragwort resources Rubus Scotch broom slider Specialist staff Staff Spotlight Tansy thistle Weed-of-the-Month weed profile Weeds weedwise

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WeedWise Program