I put an egg and extra shells when I plant roses.
I am perpetually on a high protein diet, so I don't have bananas around. I do eat a lot of eggs. (I got a good buy by getting the 5 dozen packs last time I went to the store.) I top dress parts of the garden with coffee grounds. It helps the plants and deters the neighbors' cats at the same time. Sometimes, I blend egg shells and coffee grounds in the food processor (typically if I have it out for something else anyway).
My Norwegian grandmother used to put a fish head in the bottom of any planting hole for good luck. She had gorgeous gardens. I have been trying in vain to find the type of fragrant bright pink peonies she grew. (Don't get me started on plant breeders who breed non fragrant peonies, why else would you put up with the floppy ant magnets?)
