We used clover (regular white dwarf, trifolium repens) between fixed beds in a small farm plot, instead of bare earth, to great success. We mowed them periodically with a mulching mower. It did attempt to move into the rows of crops, but we just ripped it out and used it as mulch when we weeded. When we pulled up the crops at the end of the season we found lots of horizontal roots that we'd never seen before, growing sideways into the clover. We also used clover between raised beds and had no trouble with it migrating there, but we also didn't get the crop benefit of the clover (we did have lots of visiting bees though!). We used clover last spring to do secondary paths in our baby food forest, but it didn't do a great job of suppressing the taller weeds, and still needs mowing to be maintained as paths.