We just bought the old family farmhouse from a cousin who inherited it. Cleaning out some of old Aunt's stuff I came across 2 little bottles of Potassium Nitrate. Guess it was used as a diuretic at one time. Pharmacy bottles are old maybe late 1970's for the youngest possible date. I vaguely remember the pharmacy when I first moved here.
Stuff still useful for fertilizer? Been sealed and in a dark closet. Still little salt looking crystals in clumps.
Stuff still useful for fertilizer? Been sealed and in a dark closet. Still little salt looking crystals in clumps.
Maybe others can chime in with some exact advice that ferts go bad over time, but I have never had a problem with ferts going bad over time.
