Q.Why don’t my Calla Lillies bloom?
These multicolored lilies were a gift two years ago, so twice since then, they have come up as described in the articles. Because their leaves look big (about 2′ tall), gorgeous and healthy with my care, I conclude that their container is in a good location with proper water, etc. They were in bloom when I got them but have never bloomed since.
Their name is: Zantedeschia hybrid.
Your potted Calla Lily needs a dormant period and the article below will help you with that.
https://www.gardeningknowhow.com/ornamental/bulbs/calla-lily/make-calla-lily-bloom.htm