Technically a weed, crabgrass (Digitaria sanguinalis) has a habit of infiltrating American lawns, blending in with other grasses in color and general appearance. But take a closer look and you'll ...

Add Yahoo as a preferred source to see more of our stories on Google. A person in boots digs up vegetation in the soil - Penpak Ngamsathain/Getty Images Invasive yard weeds keep us on our toes. Just ...