Since your plant was forced to bloom for Mother's Day it may be ready to rest. But if keep warm the hardy calla's do not go dormant. It's hard to tell which variety you have. Did it have a small flower and lanced shaped leaves or big flower with heart shaped leaves? Here is a link to the two different kind. Once you know which variety you have I can answer your question better. In the meantime repot it in a 12in diameter pot with fast draining soil. They love a lot a water but do not like to be in standing water or soggy. Did yours come with a plastic sleve over the pot? These will hold water. Always remove the sleve. Most of these calla below are not hardy. The flowers are smaller and leaves are smaller. http://www.pacificcallas.com/Varieties.htm You will find lots of information on this site about how to care for them. Here is a link that might be useful: hardy calla

I watched a video on growing Cannas from seed. I live in Ont. ..so I waited until the pods turned brown..almost black... https://youtu.be/ocyDPVSAD3M I opened them and saved the seeds in a dry container. In March, I took sandpaper, and sanded each seed SLIGHTLY ...just until I just saw the white part inside. I then put them in a clear glass of water in a warm place until I could see a little white "bud" protruding...this could take 1 week, so be patient! Plant them in light soil, just below the top, under ANY kind of light...I used a regular florescent bulb. (You don't need anything fancy, or sunlight)Keep the soil moist, not wet. When they get bigger, take them outside during the day, when the warm weather permits to "harden" them. (Gets them used to being outside) Transfer outside when frost is finished...usually around June 1st. Mine bloomed the first year! The seeds were from a red canna...so far, they are YELLOW!!! I'm very pleased and excited! =)

Absolutely worth a try. I don't grow them but have heard people say their calla lilies have overwintered here and there, and I believe a few strains of the larger white c. aethiopica are much hardier than people give them credit for.

if you have many.. just try it .. give it a week or so ... see what happens are they currently blooming ... where are you.. any chance at a pic .. so we can get a flavor of the situation?? ken