You need at least one roof ventilator and one side ventilator to get good air changes. The roof ventilator is the most important for allowing hot air to escape. Windows at both sides of the greenhouse can be beneficial. Louvered windows are very useful as they are easy to operate and I find hinged windows less stable in wind. Automatic ventilators are available that open the window using a plunger system. Obviously the door is a great ventilator and should be left open when temperatures reach 80 degrees or humidity is 100%. I have never needed an extractor fan but for a large greenhouse a slow moving fan can help some crops.
Readying the Greenhouse 2021
01.08.2023 - 14:31 / gardenerstips.co.uk / hortoris
It is Mid February and the milder weather encouraged me to focus on my greenhouse in preparation for the new year. For once I made a list of more than a dozen greenhouse related actions and as I progressed down the list more items were added. Without the list I would drift off to do other jobs with lower priority but higher instant gratification.
Before
I started by read a couple of books on ‘cold greenhouse & conservatory’ and ‘greenhouse gardening’ and picked up some obvious and less obvious tips. Plants need air, water, a medium to root into and sustenance. For the air part I turned the soil in the bed where I may grow direct into the soil but resolved, henceforth to provide more ventilation. A disaster struck when I left the door open and a pheasant walked in and was too thick to find its way out without my firm handed help. Jumping and flapping its wings it managed to break a pane of glass and I spent ages doing unplanned reglazing and there was no pheasant for supper.
As you may see in the before photo above I had suffered an excess of algae and moss. This was caused by lack on regular ventilation, an excess of nutrients and low levels of winter gardening. Using water from an old water barrel may not have helped. I now plan to feed little and often and to keep the soil aerated.
After
Planned Uses for my cold Greenhouse
Gizzmos for my Greenhouse
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