A lean-to greenhouse is an excellent use of space and can be warmer than a free-standing structure. It is also a big plus in terms of proximity, and ease of provision of services (power and water). The advantage of a freestanding structure is that it can be accommodated anywhere that the current garden layout allows, even in smaller gardens.
A lean to, of course, needs an area of free space against a wall, which may not be practical for some people.
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Posted in: Buying a Greenhouse