Here is a spring shot of two treatments at Martha Clara. The one on the left is the no mow only which seems to be well established and keeping most of the weeds out, minus a few dandelions. The one on the right is no mow with clover. The clover took much longer to reestablish giving the no mow time to spread. It looks like the clover also gave the no mow a little nitrogen, the growth is much more lush than on the left. There is also more room for the no mow where the clover has died back, maybe less competition?