"I could grow it back some roots if you want?" He can do that sort of thing with grapes if he feels like it, and so far today there doesn't seem to be a limit on what he can do with other plants as well, so why not? "I mean, you don't have to. It's not like it's any trouble for me to finish it." Just seemed like Magnus was curious about whether or not he could do something like this earlier, so...
no subject