Answer: Calla lilies are cyclical bloomers. If it is a new plant, it should bloom for you this summer. If it is an older plant that has already bloomed, it needs a "rest" before it will bloom again.
There is a natural resting period that callas go
through during the fall, when the leaves should wither and
dry up. At that point, gradually slack off watering, and allow
it to rest for 3-4 months. Then, repot it in fresh, rich potting soil
(make sure to place the rhizomes 4-6" deep), and resume
feeding and watering. You can keep your calla indoors, but
you'll need to stop watering in the fall so the leaves will
wither and die. At this point I'd keep it going through the
spring and summer, then force it into dormancy in the fall.
After it has rested, it should bloom again.
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