I want to add a semi-large plant to the back left corner of my tegu's enclosure (it's the only part of the cage that's not occupied by a water pool, hide, or basking area) but I'm not quite sure what. At first I was thinking a cactus (I want it to follow the tan/dark brown/grassland color scheme I have going) but then I remembered that the high humidity would be too much for it. Any ideas on a nontoxic grass, bush, or anything like that that would be suitable? I'll attach a pot to the bottom of the enclosure and add about 6" of substrate around it so I don't need to worry about him digging it up.