Oranges are the way to go. Gotta feed them the oranges and they will produce ALOT. I think it probably helps with the humidity too. Its getting colder and dryer here in Virginia lately. I noticed my humidity was too low. So I took a small margarine container and poked tiny holes in the top. I filled this halfway with water and put the lid back on and set it in the bottom of my tote. This seems to have help tremendously at least with the sheds.