My clover/chicory plot is going on it's third year. I've already mowed it twice to keep the weeds at bay. (it was two weeks in between mowings) and I will be mowing again next week (2 weeks again) then the plot is normally 80% weed free from there on. I mow my plot down to about 5" (no less in my opinion) and mow again (half of the plot at a time) when it reaches approx. 12-14". Follow farm hunters advice, he won't steer you wrong. Check out his blog, I've been reading it for the past 2 years and he's a solid guy (fellow NY no less, lol)

Good luck with your plot mossbergman!