Never have cultivated Comfrey. I’ll bet Ellendra has! ;)
I received a warning about comfrey. There are toxicity issues with it for people and animals if ingested. Banned in this country as a dietary supplement. Salves “seem” to be ok - it’s used a lot for that, but some say ‘no’ even to that because the toxin can absorb through the skin. I need to do some more research before I go there.
What I’m really getting ‘put off’ by is the invasiveness of the plant & evidently, they’re large plants as well. I’m still having nightmares from out-of-control catnip I had some years back. The cats were happy (they really loved crushed leaves in a sock with a knot in it to keep them from eating the stuff), but it took over a large portion of a garden area.
We have a decent sized patch that comes up every year. Planted just on the outside of the fence so the goats could much when they wanted. It is good for their digestion. We don’t have issues so I never made any tea to try it.