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Info:Fertilizer - Bananas Wiki
*Banana Peel: 0-3-42. Has a high percentage of Potash and no Nitrogen. An average store bought banana has a dried peel weight of about 8 grams, so the net amount of potassium per peel is about 3 1/3 grams. To acheive net 1.5 pounds of potassium per year for a maturing banana plant, you will need about 200 of those peels. To be a meaningful supplement potted ornamental flowers, you'll need about 20 per month.