I have heard several times that banana peel can be used as a fertilizer for garden plants (especially so for roses it appears) and verified it with a quick search on the Internet. As it happens, I sit on quite some banana peel right now (well, not literally) from producing jam. There seem to be various ways to use and prepare the peel beforehand:
- cutting it in small pieces and mixing it with the soil surrounding the plants
- charring the banana peel in the oven and spread it afterwards in the garden
- soak the peel in water for a couple of days and water plants with it
- putting it in the compost and use the resulting mix of fruit and vegetable leftovers as usual
What is the advantage of using one form and not the other (if any)? Could you recommend a certain way based on your experience? Is banana peel and the way it is prepared appropriate for all plants equally?