I have the blood meal for the Nitrogen,and the boone meal for the phosphorous now from what im seeing potassiom is harder and tricky some say wood ash but it will mess with my PH some say saltpeter its hard to find. HELP!

kelp, greensand. I say use then both the kelp will be readily available from the begining for the development of strong root system. Then once the greensand has broken down to become available this K can help your flowers when they need it. At least thats how I roll.