The last time I hennaed my hair, I added a little each of powdered ginger, cardamom, clove, and cinnamon. It turned out not to be enough to do much for the smell though. I'm going to be using the second half of that mix, which has been in the freezer, this week, and I was thinking of adding some finely minced fresh ginger. I've used oil infused with fresh ginger before, and it was really nice, so I know my scalp isn't overtly sensitive in a bad way to ginger, but I've never actually just put fresh ginger in something I was applying directly to my scalp (and for hours on end at that). Does that sound like a bad idea?