Good morning Elaine, you probably can't tell from the photo I posted but this tray sits upside down inside the larger one to act as a support for the top tray. Otherwise the orchids would just fall into the large tray due to the weight of the pots. I don't have any electricity to the greenhouse, yet, I'm hoping to get a generator this fall so I can put power to both of them. Oops and yes to your first question the large trays are full of water. Would it hurt if there is a bit of water on top of the perforated top tray that the orchids sit on? The reason the holes are drilled in the tray sitting upside down is of course to allow water to completely fill the large tray.
