I'm afraid there is only one answer to the problem. A wire mesh net designed and supported so that the squirrels cannot get into the orchid space from the outside, and you have complete access from the inside. I have a small bird feeding station which was plagued by the little $%**&^%***; they would remove the covers from the feeders, empty the nuts or seeds onto the ground, and eat or bury everything. So I put up a mesh net!! I spent many happy minutes watching the gang trying to gnaw through the wire. Bill
