I have a few terrariums lines with live plants. if you are going to play around with them go for tropical ones that can handle the higher temperatures. Like baby elephant ears and types of ferns. Its going to be humid so the plant needs to thrive with that as well. HOnestly, the small three to five dollar plants at like lowes or home depot work out pretty well and they are sturdy. I place them along the corners and edges in my terrarium so Indie doesn't just crush them all, but overall he likes to knock some things around. It happens. If you plant them on the insides you will need a thicker layer of substrate to actually plant the plant in, so UTH doesn't work well with this. you will have to kinda rely on lamps.