Many problem weeds like poison hemlock, plantain, and biennial thistles can be controlled with late fall applications of recommended herbicides. University of Kentucky weed scientists have developed an excellent publication, “Broadleaf Weeds of Kentucky Pastures” (AGR-207),  that helps to identify weeds, tells when to spray, and what herbicides are most effective. The UK Weed Science website also contains other publications and resources for recommended weed control. If you plan to frost seed clover in February make sure to use a herbicide with a low carryover. The herbicide label for each product clearly explains the waiting period before you can seed clover.