Best way to start fresh on an existing lawn?
I just purchased a late last fall. The front lawn is about 2500 sq ft, The grass is in bad shape right now. There are a lot of broad leaf weeds (Ajuga from what the lawn and garden center told me), moss, and some other type of tall, thick weed. My PH seems to be OK in my soil.
What I have tried:
First I put down a treatment of Ortho weed killer, a 5,000 sq foot treatment. A week later, the weed were sort of turning brown but not dying off. I put another 5,000 square foot treatment down, same result. I think tried to Round up the heavy spots just to kill everything. That sort of worked but I don't think I used enough.
Should I just till the whole lawn at this point? If I do, will that kill my weed problem or will it keep growning under and start popping up? I'd like to just till it, put some lime, fertilizer down and just start fresh but i'm worried about weeds popping back up.