But my main problems with it are that it's insidious and apparently insatiable. It sends out these awful runners that root in the ground every so often and climb over anything in its way if you let it (which I did last summer). My daylilies were lost under a mass of crabgrass. It's also pretty difficult to tear out once it gets established (as I noticed last summer and have definitely noticed again now). It's kind of like kudzu for your lawn and garden, really. I don't know if it's unhealthy for livestock or anything else--mostly it just seems to be a pain in the butt. Best to get rid of it ASAP, before it eats your garden.