Calla Lily - You obviously don't have a problem getting them through the winter. You could repot them with fresh soil. What sort of light and fertilizer are you providing them?

Alstroemaria would prefer to go into a cold room for winter versus a warm house. They are not an arid region plant either so don't let the roots get really dry (as you would for many summer bulbs in storage).

Thanks. I guess I'll just put them in the cold room in the basement and repot the callas in the Spring, and hope the alstroemaria like the cold room too.