Noxious weeds are non-native invasive plants that displace native and agricultural plants that wildlife and livestock depend on. Noxious weeds change how water moves through the soil, they change how sunlight reaches other plants and they change where wildlife live. While climbing you may encounter some of these invaders.
An annual cool season grass. It sets seed in the spring and then dries out. The seeds are needle-like and can easily lodge in equipment and clothing.
A perennial vine that grows in large clumps and on trees on rocky slopes. Its yellow flowers occur singularly and form fluffy seed heads. When it’s seeding it looks very similar to the native clematis.
A perennial with a thick taproot. Stay away from this one – its sap can cause severe blistering. Climbers will find it on rocky slopes. An escaped ornamental that was originally used as a xeriscape plant, it is moving quickly into drainages and crevices along the Front Range.
Keep It Clean!
Many noxious weeds have seeds that are easily moved by clinging to equipment, clothing or vehicles. Before you leave a site, clean off your gear and put any seeds in a bag and put it in the trash. For every seed you keep from spreading, you prevent thousands more from developing.