I built a greenhouse (not heated, I do not have power in my allotment) to extend a bit growing season (Germany). Outside temperature is now 0-15C and, when sunny, inside temperature goes up to 30C. Humidity then drops to 40-50% and the soil in my indoor beds are drying in couple of days. What is the solution to keep humidity up or at least to not dry the soil that fast. What should i expect in summer?
I added (after i took the pics) two small solar powered fans and „temperature triggered window opener“.
Attaching pics to understand the situation
by alexc2020
7 Comments
More plants and more soil will hold more humidity. You could also add a small pond or water container to evaporate. I feel like once it’s full of plants it will be plenty humid for you
Yeah, the more plants and watered soil you add, the more humidity it will have. Also, any weatherstripping you can do would help it. I grow in an arid climate though and am often around 15-20% humidity outside, so I wouldn’t even worry about it unless you’re doing tropicals.
On warm days water the floor. That will cool it and raise humidity
Drench the floor with water on hot days and the humidity will fly up!
If you are growing tomatoes, have you tried “plant halos”? I’ve not used them, but have seen other allotment / greenhouse folk raving about them so plan to invest.
Also, which solar powered fan and water fountain have you added?
Just run an extension cord and get a humidifier in there.
When it is cold outside the air is very low in humidity. Then when the air exchanges, in your house or in your greenhouse, the warmer air holds much more moisture and dries everything out.
In my greenhouse I run a mister every day. If you have water to the greenhouse you could probably use a battery powered timer to run some sort of drip irrigation misting.
You can see a quick view of my greenhouse early in this video.
https://youtu.be/UHeNRus8lcU?si=8iAdtNCPm8OAS6iW