Slowly but surely, spring is drawing nearer. Denver weather being what it is, we have been on a roller coaster ride between warm, sunny days and cold, snowy ones. But by mid February, it will be time to plant our high tunnel / hoop house greenhouse on the Littleton Farm. It is a simple, Eliot Coleman style structure, with PVC pipes covering rebar rods for the frame, and a layer of plastic stretched over it and buried on each side.
Denver is a different climate then Maine, where Eliot Coleman pioneered this type of structure. There is a greater chance of hot weather in mid winter and a stronger sun. (Last February, as we built this greenhouse, it was 80° F and sunny. ) These warm spells can give way to intense cold and high winds with little warning. Even the average winter day can have a fairly dramatic temperature swing over the course of the day. So we will be adding some thermal mass to the hoop house to damp down these swings, in the form of some 55 gal….