Originally Posted by Richard

Both of the products are water soluble, using potassium nitrate as the main ingredient. Regarding dosage, both products should be applied at a rate of 5 pounds per year to achieve 1.5 lbs net potash (.30 x 5 lbs) per plant per year. If you feed monthly that's about 1 cup per month, or weekly about 1/4 cup (4 tablespoons). Since they are water-soluble, you add them to the water and never directly to soil.

Wellsprings is currently selling 15-5-30 for $10 per 3 lbs. That works out to be 0.9 lbs net potash (.30 x 3 lbs) or $11.11 per net pound of Potash. This fertilizer is available wholesale from Scott's in 25 lb bags as an agricultural product (not necessarily for bananas). Wellsprings or their supplier is simply repackaging it in smaller bags and putting a private label on it. I could do the same thing but don't because this is not the right formula for bananas unless you are in a nitrogen-rich environment like Hawaii.

What I'm offering is the same product used for many potash-loving fruits: 20-5-30. My price is $40 per 25 lbs, and also $8 per 5 lbs. That works out to be 7.5 lbs net potash (.30 x 25 lbs) or $5.33 per net pound of Potash.

If you have a wholesale license, you can go directly to Scott's or Grow More and buy either of these products in 25 lb bags or 1 cubic yard lots for a bit less.