AndrewH_TX wrote:Is there anything you can do to help keep the heat in during the night?
Maybe add some hey/straw or mulch?
Do you really think it is needed? I really don't have the room, the thing is sealed up real well I put weather stripping around the window and caulked up all the cracks....
Needed? Well not necessarily, but the more "heat" you can keep built up the better it'll be for the plants. I believe it's more important to keep the roots warm, but you have to keep the tops from freezing since the water will expand and burst the cell walls (which I'm sure the coldframe is achieving).
I'm sure you'll be just fine, but a little extra I'm sure wouldn't hurt
It is hard to give advice for a weather zone I'm not familiar with. Not sure if y'll are receiving cool enough temps still to justify the hay/straw/mulch. I normally add hay or mulch to help keep in moister anyway though, which it'll double as a heat barrier (to keep the heat in).
I believe you are talking CCA Chromated copper arsenate not creosote. We can still get creosote railroad ties. I would not use either in a food situation. The new treat lumber, like Sun Wood maybe safer, I'm not taking a chance.
Oops, that's right CCA. I believe the EPA is trying to ban creosote RR cross ties and telephone poles. So their days are numbered. I know there are several cities that no longer allow creosote telephone/light poles.