One of the most important prerequisites for he althy plant growth is adequate temperature control of the entire interior of a warm house that is operated all year round. Not only does the greenhouse temperature have to be right, it should also be as consistent as possible.
How should temperatures in the greenhouse be regulated?
The optimal greenhouse temperature depends on the type of plant: lettuce and tomatoes prefer 24 °C during the day and 12 °C at night, melons and cucumbers prefer 28 °C during the day and 18 °C at night Robust vegetable plants can cope with 20 °C during the day and 8 °C at night. Effective temperature control is crucial.
Unlike a heated cold house, where the winter temperatures are usually only between +2 and 12 °C, temperature-controlled greenhouses are a little warmer. The year-round greenhouse temperatures do not drop below 12 to 18 °Cin favor of plant growth, so that even in the strongest January frost, summer flowers can bloom under glass and crisp winter vegetables can grow.
Even a little chubby – the warm house
18 to 24° are the standard for warm houses, which is an energetic challenge in winter. But even for hot summer days, a very complex temperature control (€38.00 on Amazon) must be available, which controls existing shading systems and the regulation of the humidity that is he althy for plants. Different types of plants differ significantly in terms of their heat requirements, even between day and night, so thatsuitable heating installation must be considered during the early planning phase of a newly built greenhouse. Some examples:
| Plant type | optimal daily temperature (°C) | optimal night temperature (°C) |
|---|---|---|
| Lettuce and tomatoes | 24 | 12 |
| Melons and cucumbers | 28 | 18 |
| robust vegetable plants | 20 | 8 |
Tip
Even if your greenhouse heater is technically capable of generating such interior temperatures, covering the house with well-insulating materials is and remains mandatory. Because extreme temperature fluctuations, especially with tropical plants, must remainreduced to a minimum.