Giant pizza wheel?
I am digging up my derelict garden, full of grass and ivy and other unwanted stuff. It would be really handy to have a tool like a giant pizza wheel that I could use to segment the sections, cutting through as much of the matted roots as possible. I am doing this with my spade but it's a bit laborious. I can picture it being easier with a giant pizza wheel. Does such a tool exist? Or maybe there's a better way of doing it than I'm currently managing with the spade?