(I know this isn't in accordance with jays empirical evidence of finding better results in use of a single species of plant per extract, and randomly experimenting, but unfortunately i couldn't find any nettle, yarrow, comfrey-the real goodies where i lived so i had to try something else.)
I've soaked alfalfa to the point where it was naturally fermented but not in the method that I believe that you're referring to using the lacto rice serum or one of the EM-1 products.
CC