Justin, sounds good.
regarding your apple tree, my girlfriend had plum and cherry trees in her yard that had never fruited after several years. I pointed out the fact that they were growing in grass, which will compete heavily for water and nutrients with the root zone of most fruit trees. I sheet mulched them last spring and started planting some guilds around them and they all fruited later that summer. Your situation may differ, as you have an old tree in need of revitalization, but I thought it was worth mentioning.
I get my comfrey online from a place near Lindsey, ON called Richters Herbs, http://www.richters.com/
. However, they had a comfrey crop failure last year (no idea how - this is one tough plant) and it's now listed as DISCONTINUED. They told me a few months ago they expect to have comfrey back on the menu next year. This set me back a bit, as well, as I've had to resort to propagating the few I have established. I'm overdue in my plan this season to divide a plant or two for further propagation. If you're interested, I can send you a few root cuttings to get you started - they're the sterile Bocking 14 variety, so you don't have to worry about them spreading by seed. As luck would have it, I'm visiting my parents in Sarnia this weekend, so I can even drop them off at your door. PM me with your contact info if you're interested.