I recently received a calla Lily from someone who had been in the hospital. The poor thing was in a plastic cup with foliage about one foot tall. I repotted immediately but it already had dead leaves and stems. There are three blooms and new shoots that were already there. How will I know if I saved it or is it too late?
Certified GKH Gardening Expert
As long as you see new or green growth, the plant is still alive and there is a chance that you can save it. That being said, it may take some time, a few years even, before it recovers completely and achieves it's former glory. So the effort to save it may not be worth the time. It is really a personal choice.
This article may help with getting the plant to recover: