We planted comfrey in the back yard once. As a green. That was over forty years ago. We never much liked the fuzzy leaves as a food, and they weren't much to look at either. But, worst, every year they doubled their space in the yard. It took me a few years of digging up roots to eradicate them.

I wouldn't grow them again, but nowadays I think they are interesting to look at. This comfrey was growing beside a path in my favourite park today.