Your image of weeds may be the dandelions growing in a lawn, the clover nudging your vegetables aside, or poison oak displaying its fall colors. Weeds can be any plant type – tree, shrub, vine, grass, perennial, or annual plants. Marin has some BIG weed plants – blue eucalyptus and black acacia, Scotch broom and bamboo, and pampas grass, or along with some rather pretty but unwelcome plants like wild onion and blue periwinkle. For some, these may be desirable plants, while for many, they are considered weeds, and even worse, invasive plants. Learn more about what invasive plants are and why they’re a problem. And some ways to prevent them from getting into your yard.