Cut off the pods, let the plants do their thing. I am in a cold zone, so they have to come in and go dormant. From a blog of gardeners in Texas
'Calla lilies are usually hardy here for us. They do not have to be planted near standing bodies of water, but will thrive in fairly moist soil. The smaller florists' varieties are better as houseplants, larger varieties outside, preferably where they will receive sun in the morning, shade in the afternoon.'