There is a particular "growth" I choose to call it,that has inhabited my neighbours yard for a few years now and is getting beyond out of hand. My neighbour two doors down dug a few up,and the root is similar to a dandelions ( sorry,I am not a gardener ),is almost 2 feet in length,but only has about 3 to 5 leaves per root (or so it seems ). He said he had to dig down almost 6 inches before even seeing the top of the main root stem. Here is a picture of the plant.no one seems to know what it is.