A friend of mine worked at an agronomist's, and at one point a customer walked in looking to buy a bag of clover for his garden. My friend gave him the wrong bag by mistake, and the customer came back a few months later to tell the agronomist that he now had to park his car over the new spinach plants EVERYWHERE.
Clover lawns use to be common but went out of fashion. I saw an episode of This Old House where they visited a grass farm and we're shown a new clover breed they were developing for lawns.