Author Archive | Sam Leininger

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Its National Invasive Species Awareness Week!

National Invasive Species Awareness Week (February 28-March 4, 2022) kicks off today! Each year, folks around the country take a week to consider the many impacts that non-native invasive species have on our communities, working lands, natural areas, and pocketbooks.  So take a moment to celebrate with the WeedWise Program to learn a little more […]

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Year in Review: A WeedWise Annual Report 2021

We are celebrating another year in the books! This past year is certainly one that none of us will soon forget. A year shaped by a global pandemic, social and political unrest, wildfire recovery, and an ice storm that has raged across Clackamas County, 2021 is certainly a year best viewed in hindsight. Despite all […]

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Naughty and Nice for 2021

We’ve been making a list, And checking it twice, Now its time to find out Who has been naughty and nice! It is a WeedWise tradition for each of our staff to select our annual “Naughty and Nice” plants for the year. Check out the latest from our staff in this fun holiday tradition! Sam’s […]

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December’s Weed of the Month: English Holly

English holly (Ilex aquifolium) is a popular evergreen frequently noticed during the month of December when festive decorators “deck the halls with boughs of holly”.  For many people, the shiny, dark green leaves and red berries of holly are synonymous with the holiday season. This popular plant, however, is not native to Oregon.  In fact, […]

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Request for Proposals: Priority Invasive Weed and Vegetation Management

The Clackamas Soil and Water Conservation District (CSWCD) is looking for qualified contractors to perform invasive weed control, and restoration planting on multiple project sites within Clackamas County.  Categories of work may include: Manual Site Preparation and Maintenance; Mechanical Site Preparation and Maintenance; Planting; Survey and Monitoring; Aquatic Site Preparation, Maintenance, and Survey and Monitoring; […]

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Tree-of-Heaven Falls Far from the Name

If you start looking around Clackamas County, it won’t take you long to find the invasive tree-of-heaven (Ailanthus altissima).  This state-listed noxious weed is increasingly more common in many of our urban areas where it flourishes.  Tree-of-heaven seems right at home in alleys, roadsides, railways, vacant lots, that crack in the sidewalk.  Very large trees […]

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September’s Weed of the Month: Knotweed

September is the Time to Control Japanese Knotweed Japanese knotweed (Fallopia japonica) has been called a “nightmare” and a “botanical bully,” and is one of the 100 worst global invaders. These characterizations give you a pretty good idea of just how unwelcome this invasive weed is in our community. Japanese knotweed is fast-growing and hardy, […]

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Tansy Ragwort Poisons Livestock and Neighborly Relationships!

Tansy ragwort has long tormented rural landowners who graze livestock. Horses and cows are especially susceptible to this poisonous weed. In open fields, grazing animals will generally avoid eating tansy ragwort, but in heavily infested pastures they may have few other options.  Contaminated hay is particularly a problem because it becomes impossible for feeding animals […]

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