In general, is there any benefit (growth, soil quality, etc) if I place eggshells on top of my potted plants?
My mother often does it to provide it organic material. She's not much of a scientist. I always ask why she does it. She explains that just does it because she's been advised to by others with more experience and swears by it.
Thus my other question: If there is a benefit of egg shells, what is it? Why is it helpful to do this?