I'm started my calla lilies in pots this year but only one bloom still trying to figure out what I need to do to improve that. However, I can tell you that yes the bulbs will get bigger. I had a couple that I had to destroy the plastic pots to get them out. Next year will use bigger pots.

I've had my callas for about 7 years now and they have multiplied well. We had a very rainy summer and my white ones did well this year, the others not so much. I have pink and purple as well and they usually all put on a great show.

Dig them up now! I dig mine up as soon as they're done blooming each year. Let them dry out, cut off the foliage and store them in a box in soil in the basement. They've come back year after year through a few different houses and gardens.

Thanks! Store in dry soil so they don't sprout?

I always use dry soil. And I try to lay them out in the sun for a couple of days to really dry them out before storing. Good luck, they really do make beautiful flowers!

I used to grow calla lilies in a large, self-watering tub. At the end of the season, I would let the tub dry out, then I would store it in a dark, dry, cool area. I did not water over the winter. My only problem was remembering to drag the tub out in the spring. A few time, I was late and the tubers sprouted in the dark. The shoots were white, but they greened up once I moved the tub outside into the light.

I lived in south-east Pennsylvania at the time, and I had a few callas that self seeded near the patio; those plants over wintered well for several years.