The role of a greenhouse is dictated by the actual climate and the destined crop. The greenhouse design and the surrounding systems enable to create inside the greenhouse "indoor" micro-climate that differs from the "outdoor" climate; warmer or cooler, depending on the required conditions. The nature and volume of the precipitation dictate the nature of the covering of the greenhouse. The interaction between the crop and the surrounding fauna, in particular insects, dictates the nature of the surrounding walls. Above all, the available budget and the expected income dictates the choice of the actual solution out of all the possible options.