I have it on a covered porch and water it every few days but it is dying. Any suggestions?
A Problem With My Calla Lily
There are many things that could be causing this. It could have too little water, too much water, pests, fungus or an environmental issue. I would recommend that you look at the standard care practices for calla lilies and make sure that you are doing them and, as a precaution, you treat the plant with a fungicide and a pesticide.
This article will help with calla lily care: