The Thorn in Our Side Himalayan blackberry (Rubus armeniacus) 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 widespread and aggressive weed is native to Armenia and Northern Iran. It is considered an invasive species in many parts of […]
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, […]
Puncturevine (Tribulus terrestris) is aptly named! This invasive weed has spiny seed heads that can easily puncture a bike tire, inflatable raft, animal paw, or footwear. Be on the lookout because it is beginning to make its way into Clackamas County from eastern and southern Oregon. Also known as “goathead”, puncturevine is native to southern […]
Get to know the WeedWise program, through our people! The success of the WeedWise program is in great part due to the hard work and dedication of our staff. If you have ever called the office or stopped by for assistance with your weed problems, you have undoubtedly worked with one of our hard-working […]
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 have been introduced here in the early 1900s through ballast water from a ship. This plant is native to Europe and Asia […]
It is National Pollinator Week! June 19-25, 2023 has been designated as National Pollinator Week! Join the WeedWise program and other organizations across the country in celebrating our native pollinators. Summer is here and the weeds and wildflowers are blooming all around us. This burst of summer color also brings the many bees, flies, beetles, […]
Policeman’s helmet (Impatiens glandulifera) is an invasive weed that grows in ditches, wetlands, and along waterways. Native to India, this fast-growing annual was introduced as an ornamental plant due to its impressive growth and the showy purple, pink or white blooms. Since introduction, it has escaped cultivation to become the dominant riparian vegetation in many […]
May 14-20 is the week that we celebrate Oregon Invasive Weed Awareness Week! This is the one week of the year to reflect on the invasive weeds impacting Oregon and for us to begin taking steps to combat these aggressive and harmful invaders. This year we want you to join others across Oregon in learning […]
Get to know the WeedWise program, through our people! The success of the WeedWise program is in great part due to the hard work and dedication of our staff. If you have ever called the office or stopped by for assistance with your weed problems, you have undoubtedly worked with one of our hard-working […]
Orange hawkweed (Hieracium aurantiacum) is a relatively new invasive weed in Clackamas County and we are working to keep it from becoming a common problem for landowners! A member of the sunflower family, orange hawkweed is native to central and southern Europe and grows in open areas like roadsides, meadows, pastures, hayfields, and disturbed sites. […]
