The Christmas cactus is on all the plant list as edible for torts. But some lists also say poisonous to cats and dogs, so feed sparingly to torts. I purchased one for Tatum and he loves it, the green plant part, it has no flowers. He does not hesitate to eat it right from my hand, first time ever, sooooo cool, but also will eat from my sons hand and they barely know each other. I want to buy another one, tortoise, OOPS I mean plant one that has flowers, but was wondering if anyone knows if they are really poisonous to torts if fed to much? By the way, Tatum is a 8 or 9 month old cuuuuttttiiieee!!! leopard.