How to grow calla lilies in pots

From one purchased calla lilly in one season we seem to have produced dozens in one pot.

But none of the plants have produced lillies. Should I let the plant go dry through the winter then remove the best looking bulbs (?) to replant in the Spring. Or is Sacramento summer temp too much for calla lillies? And thanks Naomi for your past help.

egallant5195@gmail.com

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