English ivy (Hedera helix) may conjure up images of cozy, country cottages, but don’t be deceived. This invasive weed can destroy buildings, poison pets, and topple trees. Ivy grows quickly, requires little maintenance, […]
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December Invasive Weed of the Month: English Holly
Green leaves and red berries of English holly English holly (Ilex aquifolium) is a popular evergreen frequently noticed during the month of December. Festive decorators and traditional songs “deck the halls with boughs […]
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: […]
November Invasive Weed of the Month: Spurge Laurel
Spurge laurel (Daphne laureola) is neither a spurge nor a laurel, but rather an invasive plant in the Daphne family. This perennial plant has poisonous berries, spreads aggressively in our native forests, and […]
Tree-of-Heaven Isn’t “Heavenly”
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 common in many of our urban areas where […]
October Invasive Weed of the Month: Himalayan Blackberry
Himalayan blackberry (Rubus bifrons) tantalizes us with its sweet fruits in the summer and tortures us with its prickly vines all year long. Also known as Armenian Blackberry, this wide-spread and aggressive weed […]
September Invasive Weed of the Month: Japanese Knotweed
Japanese knotweed (Fallopia japonica) has been called a “nightmare” and a “botanical bully,” and is considered invasive in many parts of the world. These characterizations give you a pretty good idea of just […]
August Invasive Weed of the Month: Puncturevine
Puncturevine (Tribulus terrestris) is aptly named! This invasive weed has spiny seed heads on it that can easily puncture a bike tire, inflatable raft, animal paw, or footwear. Be on the lookout because […]
July Invasive Weed of the Month: Tansy Ragwort
Tansy ragwort (Senecio jacobaea) is an invasive weed with a long and deadly history in the Pacific Northwest. In Oregon, it is designated as a Class B invasive weed. It is believed to […]
