If you consume lots of bananas, it is certain you would end up with lots of banana peels. Instead of discarding them, you can turn them into a potassium and phosphorus rich fertiliser.
Place a tray in the oven and lay banana peels on it.
Place the banana peels on the tray with the outer skin facing down so that they don’t stick to the tray.
Leave the tray with the banana peels in the oven when you cook other food. Save energy by piggy-backing on your normal oven usage. Don’t turn the oven on just to roast the banana peels. Leave the tray in the oven until you’re cooking something else.
After the banana peels have cooled down, break them up and store them in an airtight container.
Use as a fertilizer. Spread the banana peel mulch around houseplants and garden plants. The cooked peels will fertilise the plants as they break down.
However, you may turn the banana peels into organic fertiliser traditionally, without necessarily following these steps; just place them in your garden as they are, although burying them is a better idea. It is note-worthy that the oven baking method speeds up the drying process and kills pathogens.