I have an old clover field that I want to change over to switchgrass next year. The plan is to brush hog it low now and get a couple good sprayings in (Gly, 2-4D) going into fall. I would then frost seed the switch during winter and spray Simazine and Gly again early spring. This will be in central OH. What do those of you who have had experience killing off standing vegetation prior to frost seeding switchgrass think?