Too much of a good thing? It is VERY invasive here - NE IA. I have to keep digging up the edges as it is trying to take over the lawn. I thought it would make a great companion / mulch plant but it is like most invasives it has to be kept separate. maybe it would be a good idea to cut it back several times a year and use the leaves for mulch. That was my original idea, but I have never tried it! After planting it (long ago) I read that rather than being healthful, it was toxic, so that put me off it...
