Noxious weeds are second only to development in destroying our natural open space. These aggressive plants establish persistent colonies by invading disturbed land and natural landscapes. Leafy Spurge, Purple Loosestrife, Myrtle Spurge, Diffuse Knapweed, Canada Thistle, Russian Thistle, Poison Hemlock, Bindweed and Scotch Thistle are some of the most aggressive and difficult to manage.
Invasive weeds species come from all over the world, predominately Eurasia and Africa. Once a weed invasion is established, it is extremely difficult and costly to control and eliminate. The Natural Areas Program staff use a number of management methods.