Whitetop, also known as hoary cress, is a perennial mustard that originated in Europe that derives its name from the “top” of its white flowers that spread through San Miguel and Montrose counties at this time of year. Whitetop is rhizomatous, meaning it spreads by roots as well as seeds. Long present in western Colorado at lower elevations, it is now spreading rapidly into the mountain communities via hay and hitchhiking on vehicles, equipment and ornamental plantings. San Miguel County and the towns of Telluride and Mountain Village are working to stop this spread. For more information and to report all whitetop outside of the Wright’s Mesa area to the Weed Control Program at 327-0399.