David,
I wouldn't put the mullein into a coffe grinder if you're making tea, just use the cut leaf. If you try to powder it and use it in a tea, the powder will clog your strainer and you'll have some very gritty tea.
But do use a coffee grinder and try to powder it as much as possible if you're putting it into capsules.
Adding ginger to the mix will cleanse the lungs quicker. I prefer capsules, but get lazy and end up making teas..but with capsules it's easier for me to consume more herb throughout the day.
Dr. Morse's three lung tea is equal parts by weight mullein leaf, pleursy
root, fenugreek seed. I haven't tried this combination in capsules, only tea...
and I can say when I took the ginger capsules combined with mullein capsules I had better lung cleansing than the times I've drank teas....but again I took lots of capsules per day compared to a few teas.