I keep one live potted plant in each of my snakes cages. They like to dig in the dirt, some more than others though. I think it helps keep some humidity too because I live in a desert area and it is very dry. I just water them once a week or so. I've never had a problem. I have Pothos plants because they are easy to care for (even brown thumbs can grow these) and healthy for your home
Pothos - Plant Encyclopedia - BHG.com