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, […]
Tag Archives | invasive weeds
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 […]
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 […]
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 […]
Tansy Poisons Livestock – and Neighborly Relationships!
Tansy ragwort (Jacobaea vulgaris) has long tormented hay producers and rural landowners who graze livestock. Horses and cows are especially susceptible to this poisonous weed. In open fields, grazing animals will generally avoid […]
Clean Your Boots to Protect Our Natural Areas
Clean your boots! And your sneakers, sandals, and flip-flops too. Give them a quick check before and after you hike to prevent the spread of invasive weeds. Summer is here and that means […]
National Invasive Species Awareness Week, May 15 – 22
What’s better that one National Invasive Species Awareness Week for 2021? How about two? National Invasive Species Awareness Week Part 2 (May 15 – 22, 2021) is upon us! Take some time this […]
April Invasive Weed of the Month: Garlic Mustard
Garlic mustard (Alliaria petiolata) is an increasingly invasive weed in our community. Native to central and western Europe, this fast-growing plant commonly invades sites such as parks, trails, roadsides, and streamsides. April is […]
