they do go yellow if they are finish flowering how long have you had them in the ground and how big was the bulbs when you planted them and what colors were they Anna Lisa

We were given this potted calla lily plant as a gift, shortly after we received it the flowers started to wilt one at a time, now all the flowers have wilted. The leaves appear to be fine.
I water it when it looks dry, but no results re the flowers.

Any suggestions?

Thanks.

Mona

Mona,
If the leaves appear healthy it's likely that the inflorescence (flower) has matured and is dying back. Can you see seeds inside the spathe (petal)? With many callas an older spathe will turn green on the outside (it is a modified leaf after all). By removing the spent flowers you'll be allowing the plant to devote more energy to leaf and corm growth. A picture would be helpful.