Intended to lean up against a long wall of your house or garage, this greenhouse is constructed of a nice wooden frame and poly sheeting. it�s simple to construct, and should easily hold up to most weather conditions thanks to its angled roof.. Lean to greenhouse, wooden greenhouse, lean to greenhouses uk. find this pin and more on gardening! by lee hawthorne. wooden lean to greenhouse 291 - part boarded, hinged door this lean to greenhouse is a high quality building designed to help you save space in your garden and has an attractive and wooden frame.. �