I have been growing my orchids outside for 9 years, we only bring them inside when the temps are going to be below 40 deg F. but my orchids (Dens,Phals,Catts and Schombs) that are on the trees obviously can't come in. We have had temps as low as 31 and they have not suffered any ill effects except occasional bud drop. These temps don't last long usually no more than 2-3 hours. So my question is how cold is too cold or is it the length of the cold snap that does the damage?
Cin