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Greenhouses come in all shapes, from standard rectangular shape, to round or even conservatories connected to house. There is no best size for a greenhouse. The size that fits your space best works fine. Even a small greenhouse can accomodate many plants. Some commercially made greenhouses are extendable with add on sections to add as needed.
The best available material for a greenhouse frame is aluminum. The maintentance is very low, it never deteriorates, and it allows most light in due to it being thinner than wooden frames.
Make sure you allow for good ventilation. Allow room for at least one work bench. Keep in mind that you will also need storage space in greenhouse for extra pots, hand tools, etc.
Matthew Leo is the publisher of numerous websites, including Organic Gardening, Practical Wine and Cooking Recipes