I accidentally killed my butterfly bush, but there are healthy looking roots everywhere. I'm assuming they are the the butterfly bush's roots, but I'm not too sure. They are white and about an inch thick. Also, there are sprouts coming up that look like cabbage. They are attached to a huge orange root system. Does any of these 2 roots sound like the butterfly bush's roots? And if so, can I grow a new bush from the roots alone? Thanks!