The invention relates to mini greenhouses having the form of a pyramid, triangular arch or trapezium (19,20,21,22,57,58,59) as well as to a kind of mini greenhouses-dryers used in winter time. Said mini greenhouses are aiming at the maximum growth, flowering, fruit-bearing and, thereby, at the profuse production of vegetables, agricultural products (tomatoes, peppers, courgettes, aubergines etc) and fruit such as strawberries grown in winter time.