5. Compost
Compost is a mixture of ingredients used as plant fertilizer to improve soil’s physical, chemical, and biological properties. It is commonly prepared by decomposing plants and food waste, and recycling organic materials and manure.
The easiest thing to do with leftover banana peels is to pop them in your compost. The peels add phosphorus and potassium to your compost which will help with plant growth once the compost is mature.
10 Amazing Ways To Use Banana Peels