Cold treating Den Nobile hybrid

[SteveM]

Hey all,

I have 2 den nobile hybrids out in my unheated greenhouse. Right now the temp outside at night is whats inside. Not insulated very well, old 4mm poly carbonate panels, but it does not get any condensation or frost inside and is sheltered from any wind, other than a small fan on very low just to circulate air. I know others have worried about subjecting them to too much cold. Anyways the past 2 nights we got down to 38, days rebound to the low 80's inside greenhouse. They both look good with the exception of 1. One of the oldest leaves is turning yellow down the middle vein. Anyways Its going to warm up slightly and make it back in the mid to low 50's at night in a few days. Tonight should be 42ish. its pretty dry in there, I did have to water them both today, I watered very lightly. So I will probably take 1 in tonight and see how the other one does. How low has anyone gone with nobiles. I do know that it will take a few days before they respond to cold damage. also which one would take the colder temps better after watering one in lava rocks or one in fine ochieata bark. I am also worried about the large temp differential. Also if I bring them in for a day or 2 and they will be warmer than 68, will that throw off the cold treatment.