why would you sayit wouldnt work?? if the pills are water soluble pills, if mixed with water, i really dont see why it wouldnt work. I mean, im no super expert or nothing, but plants suck up water, and anything in the water that is put there by us, acting as nutrients. If he were to use a water soluble powder form of potassium and nitrogen, i dont see why it wouldnt work as long as it mixed with the water to create a completely liquid solution with no granules or anything....