I would like to put some different types of plants in my Button Quail's cages. I was thinking about Kale, Lavender, Swiss Chard, or Clover. I could probably only do 1 - 3 plants, as their cage isn't big enough to do anymore than that (18" L x 30" W x 30" H). It would be nice if the plant served a purpose, such as a treat for the Button's, an aid in odor control, or decoration for the cage (something pretty). Any thoughts?