Hey folks, I'm new here and to this whole permaculture thing. I recently started growing a bunch of perennial plants that sounded useful, one of which was a young comfrey plant. Everything was going fine until I noticed strange white spots developing on the large leaves after a week or so of it growing in the ground. I did a little googling and found out that these are probably a fungus called "powdery mildew" and that it would kill the leaves if nothing was done. I also read that you can stop the infection by spraying a water and baking soda solution onto the leaves. I did this, but after a day of doing it the leaves turned brown, drooped to the ground, and ultimately died. i'm thinking the baking soda is responsible for that, but I don't really know. So I guess what I'm asking is: Has anyone here had similar problems with "white spots on leaves" and what was the solution for you?