I throw as much stuff as I can think of into my clover in the early spring and again around the hottest part of the summer. And I don't count any of the wildflowers as weeds, even though one or two of them are invasive. They behave for me, so I don't get too worked up about it. Sedge is about the only one that holds back my clover. The rest seem to exist with it just fine. I work really hard to assault my clover with anything else I can get to grow in it; things I choose anyway. This year, I've already thrown in pak choi, willowherb, flax, brassicas, forage oats, spring wheat, and barley. When I come through and mow midsummer, that takes care of about everything and then I throw the cereals at it again to prep for cool season.