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Creating the correct greenhouse climate

Posted on August 23 2019

Creating the correct greenhouse climate

Five useful tips for creating and maintaining the correct climate in your greenhouse

A greenhouse is ideal for growing plants. But bear in mind: establishing the right climate is a key element to success. How to accomplish that? Check these 5 tips!

First of all: be aware of different needs

In general each and every plant has specific needs: the perfect temperature for one may be completely wrong for the other. That's why it's so important to be aware of their various requirements. So, when growing plants in a greenhouse the most convenient way is to select plants sharing the same needs as to heat and humidity.

Exotic fruit vegetables such as aubergines (eggplants), red and green peppers and chilli peppers, as well as tomatoes and cucumbers, all thrive at around 20 degrees Celsius, meaning they will do perfectly well when grown together in a greenhouse.


1. Choosing the correct position in your garden

First and foremost, build your greenhouse on the sunniest, most sheltered spot in your garden, also keeping in mind the predominant wind direction and to which purpose you are going to use your greenhouse. Benefit from out tips by checking greenhouse location, and what to consider.

2. Put a thermometer in your greenhouse

Measuring does the trick… a thermometer will tell you all you wish to know about the temperature inside your greenhouse, whether it's too high or low. Too high? Ventilate some more. Too low? Installing a small heater or heat lamp might be very helpful.

3. Humidity alert!

High temperatures in greenhouses can cause large-scale vaporization, resulting in a rapid rise of humidity levels. Many plants do very well in humid climates, but moulds love hot and humid circumstances too and will increase alarmingly quickly. This, of course, is something you will wish to prevent. So, keep an eye on humidity levels by using a moisture meter, or check foil or windows for condensation spots following this simple rule: extensive condensation is the result of high humidity levels.Lower these levels by adequate ventilation (open windows and/or door(s)) and water your plants at root level only, to restrict condensation.


4. Provide sufficient light

Plants need light in order to grow, so an impressive 90 percent of any greenhouse or polytunnel consists of glass or foil. By positioning your greenhouse or polytunnel on the sunniest spot in your garden, you will definitely make the most of all available light. Would you like to prolong the growing season right into autumn, when days shorten and light levels get low? Or does summer prove to be particularly dark and gloomy? Install greenhouse lighting, using grow lights.

5. Control heat

Glass and foil convert sunlight into warmth-energy, causing temperatures inside greenhouses or polytunnels to rise quite quickly. Especially on warm summer days  - clear blue skies, sunshine all day long - it can grow too hot surprisingly fast. In summer, reduce temperatures by opening a door and/or window, preferably at all times. Or, additionally, whitewash some or all windows, or use shadow covers, thereby reducing heat and fierce sunshine, but allowing enough light in for your plants: thus creating a perfect greenhouse climate.