Built our first spring here in Montana (1997) using old window frames, it's nice to see our old coldframes back in use again. Their glass panes broke in windstorms the first couple of years we used them but plastic works just fine, too, and you don't end up having to pick glass shards out of your seedling pots. They just doesn't look quite so pretty minus their original glass panes.
In the middle frame are nursery bought garden starts and flowers and the other two are filled with our own starts:
Even using these, on colder nights (tonight) I'll often throw a wool blanket or two over the tops of the frames containing more frost sensitive plants such as peppers, tomatoes, and basil, or sometimes will instead bring those plants into the house overnight. Even with the extra protection of a blanket, they can easily be frosted on the coldest spring nights.
With such a dark and dreary, cold spring as we've had up until now, all these little babies are so happy to be out in brighter light and warmth now, awaiting transplanting into the garden and greenhouse.....except....
...the top numbers above? Those are the low temp in the greenhouse on Saturday morning of 33.8 degrees F and the high Sunday afternoon of 103.8 degrees F. Monday it went even higher to 109.5 F!
So, we put all this work into creating a greenhouse to ward off the cold, and as soon as it's done, we find ourselves having to buy shadecloth for it to ward off the heat? All I an say is that it's a good thing we waited to plant in there. We're going to install an automatic vent and put up the shade cloth and see how that works before planting.
And thank goodness for those old coldframes. Just wishing now that I'd never painted them so that they wouldn't be flaking paint all over the place now. : }