my mother used it on all types of plants it helps but its a subtle reaction your not going to wake up the next day and see a difference, and you need to let them decompose in water or ferment what ever you want to call it,

1 gallon of distilled water
1/2 dozen egg shells
break the shells up and put in the gallon of water and let sit for a month or two.

__________________
I am a liar I like to lie, everything i say here is a complete fabrication of my imagination. And the pictures are from the internet.