By Barbara Damrosch and Eliot Coleman
Many gardeners use cold frames and quick hoops for season extension, but just beyond these is a simple and super-productive option for the home gardener: a small, low-cost, portable greenhouse. We’ve found that you can build a 10-by-12-foot greenhouse for less than you’d spend on a store-bought 4-by-4-foot cold frame. Our goals in designing this movable greenhouse were that it be simple to build with off-the-shelf parts, easy to move, easy to anchor and inexpensive.
Even gardeners in moderate or warm climates can benefit from a greenhouse, which gives you much more variety in your winter fare, and also makes the experience of growing it more pleasant. A greenhouse furnishes a warm and sheltered spot for plants, but because you can stand up inside of it, it also shelters you.
Similar to a cold frame, a simple greenhouse captures the sun’s heat and eliminates…
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