I Got A Small Calla Lily For A Gift Last Halloween And I’ve Kept it For Quite Some Time. It Has Been Dormant
for quite some time. I started to water it and nothing happened. The bulb has quite a few clusters.
Certified GKH Gardening Expert
Unfortunately, your photo did not come through. You can try lightly scratching the bulb to test if it is alive. If you feel living material, then it is likely just waiting for the right conditions to sprout.
This article will help you to grow them: https://www.gardeningknowhow.com/ornamental/bulbs/calla-lily/growing-calla-lilies-and-care-of-calla-lilies.htm