Hi, I have a question my vet can`t answer, I have one of bedrooms into a cat room, wall mounted tunnels, wall mounted beds at the window, my question is I put up a corner shelf and I would like to put some greenery around it to give the cats a little hiding place, I have seen cat towers with fake greenery but not sure what to put, if anything, that is not harmful, any help would be great, Thank you 
