The small greenhouse - part 3

Even so, orchid lovers often work successfully with the most primitive facilities, z.B. with duct heating, Petroleum- or catalytic ovens and other possibilities. The warm water heating naturally offers the greatest security; however, it is only debatable when the greenhouse is of a certain size. A vestibule is also required for the installation of the boiler, otherwise through smoke- and exposure to dust there are hazards for the plants. In principle, there are two design options, which in turn have an influence on the heat retention as well as on the entire greenhouse climate. In the past, so-called earth houses with low enclosing walls were also common in commercial horticulture, which is placed directly on the roof surface without standing walls. The bed areas are at ground level, the central aisle is sunk into the ground, and the heating pipes run along the wall. The humidity in such an earth house is very favorable, heat retention is also advantageous. This type of construction brings excellent results with orchids that are to be kept cool and moist: Paphiopedilum, Odontoglossum, Lycaste, Masdevallia u. a.

The direction preferred today is characterized by low wall plinths with attached standing walls and a ground-level central aisle. The interior construction consists of tables with paving made of moisture-proof material, possibly also slatted frames. Such a glass house is lighter and more airy, however, it cools down more in winter. The natural humidity is lower than in the earth house, however, it can be increased by keeping the floor area moist. All orchids with a high need for light thrive here: Cattleya, Dendrobium, Vanda u.a.. Double glazing on the sides is appropriate for this type of house- and roof surfaces, which creates a very favorable greenhouse climate. The air layer between the two glass surfaces insulates the heat as well as the humidity. The cooling effect of wind is greatly reduced. A saving in heating costs will soon amortize the higher construction costs.

Equivalent to a greenhouse is a veranda that is glazed on all sides, even if the roof surface is made of glass or a translucent material. Of course, this is not an indispensable requirement. The light is enough too, if the side glass surfaces are large enough. However, a lot of glass causes a relatively strong cooling in the cold season, which can only be counteracted by a sufficiently high heating capacity. However, the influence of the cold in the ground is largely eliminated, which can be very dangerous for small spaces that are free on all sides. For the heating only the connection to the hot water heating comes into consideration – if available!

This category of accommodation also includes balconies that are glazed on all sides. The promotion of development is much cheaper than exclusive room maintenance, especially in the warm season. Both rooms – Conservatory and glazed balcony – are good for wintering species that need to be kept cool, that get by with the lowest temperatures and dryness at the same time.

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