These weeds further weaken the grass by competing for water and nutrients. I sprayed them, but most of them are still there. Broadleaf weeds are best chemically controlled when they are 4 to 8 inches tall, before heading. That usually means spraying around the end of April, when the grass is thick and lush and you don't think you have a weed problem. Spray for broadleaf winter weeds the end of November.
Herbicides are much less effective once they have begun to head out.
Bushhog the pasture after heading begins to prevent the weeds from going to seed. A good fescue stand will have 40 to 60 seedlings per square foot by November. This will thicken up to provide 90 to 100 percent ground cover, shade out germinating weeds, and produce high yields in favorable weather conditions when managed properly. Drilling concentrates the seeds within a furrow. The seeds occupy a smaller area of ground and are better able to break through the soil crust.