Q.What to do with calla lily
The calla lily (in a pot) bloomed in the spring and over time looked like it was getting another bloom but it never did open. It’s head drooped and remained green. Can I remove it and plant it?

A Calla Lily flower will not root.
You can divide a plant to create more plants if the pot is crowded.
If you plant didn't bloom it could be a few different reasons.
Here is a few links with growing and care information to refresh you.
https://www.gardeningknowhow.com/ornamental/bulbs/calla-lily/growing-calla-lilies-and-care-of-calla-lilies.htm
https://www.gardeningknowhow.com/ornamental/bulbs/calla-lily/dividing-calla-lilies.htm
https://www.gardeningknowhow.com/ornamental/bulbs/calla-lily/green-calla-lily-blooms.htm
https://www.gardeningknowhow.com/ornamental/bulbs/calla-lily/make-calla-lily-bloom.htm
https://www.gardeningknowhow.com/ornamental/bulbs/calla-lily/deadheading-calla-lily-plants.htm