Bananas are not only wonderful sources of potassium for people, but their peels are a great source of phosphorus, potassium and other important trace minerals for plants.
Phosphorus helps plants convert sun's energy, and other chemicals such as nitrogen, into usable plant food.
A phosphorus deficiency will lead to stunted, sickly looking plants that produce a lower quality fruit or flower.
Potassium helps develop strong flower growth and fight off plant diseases.
Trace mineral elements basically make soil work so you can easily amend tired soil by giving it a banana peel, which will break down very quickly.
To dry banana peels. Place them on paper towels in an open weave basket and allow to dry.