1 Building The Modular Moveable Greenhouse described in “The Four Season Farm Gardener’s Cookbook” By Barbara Damrosch and Eliot Coleman This modular greenhouse is designed so home gardeners can easily build their own greenhouse. All of the major parts in the list following are available at your local home projects store. We have conducted workshops to build these modular greenhouses with groups of gardeners and the quick and simple process always delights everyone. All of a sudden, there it is, a greenhouse. First, here is an overview of the project. Specific instructions will follow. The modular greenhouse has five major components – the hoops, the connectors, the plastic, the anchors, and the doors. 1. Each hoopis made from two 10-foot long by 1-inch diameter lengths of Electrical Metal Tubing (EMT.) Since there are three hoops in this greenhouse you will need six lengths of EMT for the hoops. Each length is bent into a ¼circle using a # 7000 curved bending form from the Johnny’s Selected Seeds catalog. Two quarter-circles together make a half-circle. The bending forms are sold with detailed instructions on how to use them.
2 HOOP 10-foot long quarter circle 10-foot long quarter circle 12 feet 6” 2. There are three connectors. They each consist of a straight 10-foot length of EMT with three 6-inch lengths of chain link fence top-rail pipe bolted on – one at each end and one in the middle. Two of them, the base connectors, lie on the ground, one on either side of the greenhouse, to secure the bottoms of the hoops. The third, the top connector, secures the upper ends of the hoops at the apex of the greenhouse. These are all placed with the long length of EMT to the outside of the greenhouse.
3 CONNECTOR 10 feet 6 inches 3. The plasticcovering is what creates the greenhouse climate. It lets in light but keeps out the cold dry winds that kill plants in winter. We highly recommend a commercial grade, ultra-violet resistant greenhouse plastic over the hardware store variety, which, since it is not manufactured to resist sunlight degradation, will break down in less than a year. The plastic is used both for covering the greenhouse and for making the doors and is attached to the pipe frame with form-fitting plastic snap-clamps. (Both the greenhouse plastic and the snap clamps are available from the Johnny’s Selected Seeds catalog.)
4 4. The corner anchorsconsist of four lengths of top-rail pipe, each 2½feet long. One is driven in at each corner of the greenhouse and each is attached to a U-bolt that secures to the base connectors. Drive each anchor pipe into the ground to its full length, if possible, leaving just 3” protruding. The scissor door anchors consist of two lengths of top bar pipe, each 2 1/2 feet long. One is driven in at the base of each door and holes in the door tubes slip over a bolt in the anchor pipe.