Tip: Cheapest Banana fertilizer.
I recently obtained a Banana fertilizer that is high in K, and it has loads of minor nutrients too: S, Fe, Mg, Mn, Zn, etc...
It is the 6-20-20XB lawn starter fertilizer from BEST. I got mine for just $16 for a 50 lb bag. Although we don't need much P, it doesn't affect the bananas that much (except perhaps encourage it to pup more). K is more crucial for bananas than N, especially if you want fruits. If you need more N to encourage growth and pupping, simply add ammonium sulfate (another very cheap fertilizer) to the 6-20-20XB fertilizer.
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