Do not let the weed have a chance to reproduce. There are several books with colorful pictures of weeds that can be used for identifying plants. Or you can call the Larimer County Weed Control District, Colorado State University, or the Larimer County Extension Service for help identifying unknown plants you find on your property. The Larimer County Agronomist in charge of the Weed District will come out to your land and help you do a site analyze and help you develop a management plan. Chemical Control Herbicides used properly by following the label and with common sense, is one of the main methods of control.
Herbicides have several different modes of action.
Before purchasing any herbicide, read the label to ensure that particular herbicide will do what you intend it to do. There are herbicides that will only effect broadleaf plants. Some will only effect grasses. These type herbicides are called selective. Examples are 2,4-D, Banvel, Tordon, Poast and many more.