I just beat the shit outta my pm using just water ph’d up to 9 or so using wood ashes. Whatever kinda wood you burn, up here we burn tamarack and Douglas for. Add ash to h2o, filter through a sock or whatever, then spray it on. Ash is mostly potassium carbonate with some calcium, some magnesium and a bunch of other micros, so I use it as a foliar with worm casting tea. I like keepin the ph around 6.8 for foliars, but beating pm needs that hi ph I think. Maybe next time, I’ll ph to 7 and see if the compounds in the ash are enough. Hope this helps somebody that’s stuck on the cheap.