How do I care for a calla lily that is in a pot in winter
Bought this lily as one plant and somehow the second season it seems to have produced many plants, none of which have done well. Should I stop watering and in the Spring dump the soil and re-plant a few of the small bulbs (?) or are Sacramento summers too hot for Callas.
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You will find good information here: https://www.sundaygardener.net/how-to-repot-your-calla-lily/
If you are worried about the cold weather, you may need to bring them in for the winter. I found a good article on overwintering calla Lilly. It says in zone 8 or above, they can survive in the ground, otherwise they need to come out, so I would assume in pots you will have to bring them in. Divide them up and put them in differing pots so they aren't overcrowded. Here is the article, I hope it helps you, Elizabeth!
https://www.gardeningknowhow.com/ornamental/bulbs/calla-lily/calla-lily-winter-care.htm