Greenhouse framing takes second billing to the material used as siding, but something has to hold up your greenhouse and a good frame can mean the difference between holding up to the wind or continual maintenance. Many times your choice of framing is determined by your choice of siding. Heavier siding requires a heavier frame. Wood is beautiful, but aluminum, galvanized steel or PVC are far more durable. Here are some tips to help you choose.
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[Source: About.com Gardening: Most Popular Articles]