Greenhouse posts should be either concrete, wooden, or steel as appropriate to the area and virulence of the wind.
A.2.2 The surrounding area of the greenhouse should not have any large tree. The roof of the greenhouse is shaded by net (with the exception of Vanda greenhouse) stretched tightly into one piece. In case of medium or large greenhouse where air ventilation may be poor, the net shall have a space of approximately 15 cm or overlapping 50 cm every interval of 20 m – 25 m. The relation of the orchid genus, greenhouse height and light intensity are provided in Table A.1
Table A.1 Relation of the orchid genus, greenhouse height and light intensity (Section A.2.2) Genus Greenhouse Height (meters) Light intensity (%) Dendrobium 2.5-3.5 50-60 Oncidium 2.5.3.5 60-70 Aranda and Moccara 3.0-4.0 40-50 Vanda, flat leaf 3.0-4.0 50-70 Vanda, groovy leaf 3.0-4.0 40-50