Way to go, Mitchel !
If those were dried banana leafs, then the potassium content by weight will be:
- about 1.5% if you have not been fortifying with potassium in the past year
- about 3% if the plant has been receiving over 1 pound of potassium per year
Don't worry about overdose. You'd have to apply 50 lbs of banana leaf ash per plant per year for that!
