Just an FYI, when getting a plant for your cage it is absolutely necessary to take it out of the pot and totally spray ALL the dirt off the roots and wash the leaves and stems. Buy a new plastic pot with a dripper plate underneath. Really, they are cheap and will catch any water that comes out of the plant from overwatering. Then, in the bottom of your new plastic pot put some clean rocks or broken ceramic pot shards. This will help the holes in the bottom of your new pot to stay open and drain well. You can then add your dirt without fertilizer. I always like to have a little fish aquarium charcoal mixed into the dirt at the bottom which will keep the dirt smelling fresh and clean. Leave about 1 1/2" at the top clear to put rocks in so your cham doesn't dig in the dirt and eat it.
Replanting your plants in this manner will give your guys a clean, chemical and bug free plant to live in. I also lay a paper towel or a circle or newspaper over the rocks on top which I change at least once a week to catch poop. They do like to poop in the rocks and then your good job of providing a clean environment gets dirty really quickly.
Good luck!