Greenhouse Ventilation and Shading
Posted by Alix on 15th Jun 2018
No matter if your greenhouse is glass or plastic, overheating can be a big problem for your plants.
During the warmer months greenhouses begin to produce high levels of heat that puts your plants in danger of wilting and drying out.
If plants are subjected to prolonged high levels of heat they are unlikely to survive, plants need shade, water and a cooling air circulation.
However, you can learn how to protect your plants from excess heat by ventilation and shading.
How to ventilate and shade your greenhouse
The easiest way to ventilate your greenhouse is to open the roof and side vents along with the door to provide your plants with good air flow.
On Sunny days this should be done first thing in the morning and warm nights keep the vents open but peg up netting over the door to prevent wildlife and pests from entering.
Monitor the temperature with a maximum-minimum thermometer to help keep temperatures below 27°C (81°F) anything above that will start to cause damage to your plants.
You can buy auto openers which can be very useful if you are away from home or on holiday.
Shading Your Greenhouse
The downfall about shading your greenhouse is that plants need light levels to be good to grow to their full potential.
You can invest in shade paints as a quick and cost-effective way to filter out some of the sunlight and wash off when it’s no longer needed.
Depending on budget, internal and external blinds can be fitted to the greenhouse to protect your plants from the sun’s rays, alternatively mesh or shade netting can be fitted to your greenhouse using clips.
This method is a cheaper and easier way to shade your greenhouse without having to invest time and money into trying to achieve the same results you’d get from mesh or shade netting.
Damping Down Your Greenhouse
If the weather gets hotter, another way to cool down your plants is by damping down your greenhouse.
Damping down is where you raise humidity inside the greenhouse by wetting hard surfaces such as paths and staging.
Moisture levels in the air raises as the water evaporates which helps plants to stay cool and cope with the heat, increasing the moisture also has other benefits such as keeping pests away like red spider mite.
You can damp down the greenhouse as often as you can, especially if it is very hot. If you can get out to dampen down once in the morning and once in the evening that would be ideal.