Weeds are the most significant cause of pasture establishment failure. Therefore, site preparation and elimination of weed competition are essential for successful establishment. Since there are many broadleaf and grassy weeds that can compete with new seedlings, and their occurrence is determined by many factors, such as location and previous history, producers will need to confer with local agricultural professionals for the best weed control approach. This is particularly critical when grassy weeds are encountered, such as browntop (Agrostis capillaris L.), couch [Elymus repens (L.) Gould subsp. repens], winter grass, bentgrass (Agrostis avenacea J. F. Gmel.), paspalums (Paspalum dilatatum Poir. and P. distichum L.), and other grass or cereal crops.