Technical Abstract: New weed problems continue to evolve in mint production. Common groundsel, western salsify, white cockle, rattail fescue are four weeds that are difficult to control and often escape weed management programs in mint production. All four of these weeds have the ability to germinate in fall and spring. Fall germinated seedlings are often too large to control well with spring applied herbicides. Fall tillage and/or fall applied herbicides can often improve control of these and other winter annual weeds. Specific herbicide treatments that effectively control these weeds are discussed. Herbicide resistant weed biotypes have been confirmed in mint production in the Pacific Northwest, with resistance to terbacil being the most common. Altering weed management practices and crop rotations and avoiding using the same weed management strategies and herbicides year after year facilitate the prevention of herbicide resistant biotypes.