At my workplace we have what I think are calla lilies in big pots. They are right between the door from outside and the door to inside entryway. These plants are not surviving at all and I'm wondering if there is a specific reason as to why they are dying, or the best way to help them thrive. Maybe cutting the calla lily down to the soil? Or just keep watering and hoping for the best? Also, when deadheading a calla lily, where do I clip off the leaf for best results? Thanks for all your help!
Your question brings up so many other questions, I hardly know where to begin. At the end, I guess. Dead heading is done flowering plants to keep them from going to seed. Here's more on that: https://www.gardeningknowhow.com/ornamental/flowers/fgen/deadheading-flowers.htm
Calla lilies are a kind of plant that goes dormant in the fall - in other words, they die back every year, which they would be doing now. This article tells you more about calla lilies: https://www.gardeningknowhow.com/ornamental/bulbs/calla-lily/growing-calla-lilies-and-care-of-calla-lilies.htm
Now here's my big question - are they really calla lilies? Are they, possibly, peace lilies? https://www.gardeningknowhow.com/houseplants/peace-lily/peace-lily-plants.htm
Peace lilies are often used by interior landscapers because the are long-lived, attractive, and adaptable to many environments and care schedules. (Qualities all of which are missing in calla lilies, I might add.) If they are peace lilies, they could be dying because they're too wet, too dry, or (if you're in a cold area) the cold drafts are killing them.
My next question is, who put these plants there, and who is taking care of them. Plants in workplaces, especially larger buildings that contain a number of offices, are usually installed and maintained by professional plant care companies, often called interior landscapers. If you're in a larger building and this is the lobby area, talk to the building manager to find out what's going on - the plants shouldn't be dying. Perhaps something happened to the plant service. But you can't start messing with plants until you find out who owns them. Even if they're calla lilies (unlikely but anything is possible,) and you are located in a small office, someone must have put them there, so you need to track down the owners before you think about cutting or fixing.