They are good for your plant! But only when added to a compost heap and composted downI read somewhere that crushed up egg shells are good for your plant.
I added some to my soil yesterday...good or bad?
grind what? the egg or the shell. and then what?The key,is too boil the egg,remove the shell,and let it get dry.Then grind it to a powder,you can use a coffee grinder.