I say let them invade...LOL. The top blooms will give me more seeds to feed I hope. Also I'ves seen some say it's a good cover crop plant if I plant outside it will smother some weeds and be a good chop and drop mulch.
Up until a few year's ago when the new neighbor's moved in across the street, there used to be some of the cow's clover that grew by my mailbox. I used to pick it to feed to the Australorp's that I had back then. It doesn't grow over there now anymore, since they dumped a bunch of rock's out there.

