I am in western PA. We have about 4 acres that have been limed and fertilized about 3 years ago and planted in imperial clover, FM brown's megabucks clover and regular feed store clover. Every year the clover jumps up and looks great, but when the weeds catch it, that is it, even after mowing 3 times a year. I figure chemical control is our only option. What herbicide would be the most useful? I thought of two, butyrac to control the broadleaf weeds and vantage to control the grasses, Am I on the right track? What time of the year do we spray and how often. Or do we use a roundup and kill everything and start over? We have a lot of money in seed, lime and fertilizer but the weeds are killing us.