Calla Lily species
I have several Calla lilies that I have grown in pots for a few years. Most are hybrids, but I believe that 2 pots are species due to the lack of capitalization in the name. The are referred to as 'giant white'. They only bloomed for the first summer. I bring them in after frost. I recently discovered that they aren't dormant but are currently growing in my basement. It is dark and fairly cold, slightly above freezing. I suspect that is why they don't bloom. How do I get them dormant or, more importantly, what does it take to get them to bloom again? The hybrids are easy and reliable and they are all grown together.
Certified GKH Gardening Expert
Have you been watering the plants? In order to go dormant, not only do they require darkness, but must also remain dry. Perhaps these articles will help you: https://www.gardeningknowhow.com/ornamental/bulbs/calla-lily/calla-lily-winter-care.htm