How do I grow vegetables in a greenhouse?
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When the weather isn't cold be sure to open the greenhouse (weather permitting) to fresh air inside. Buy a gauge that will let you know how high the humidity is because too much will cause a lot of problems. You could rig up a homemade watering system which will assure that your plants get a consistent amount of water.
Here is an excellent tutorial that walks you thru the diy watering set up:
https://pvc-innovation.wonderhowto.com/how-to/make-self-watering-greenhouse-in-depth-tutorial-0130203/
Almost forgot you will need something to move the air. Not hurricane force but a gentle flow. We used a box fan on the lowest speed. You can generally pick them up at your local thrift store especially this time of year.
Depending on how cold it gets where you live you might consider a small heater. You can buy gauges that will help you keep the temp at the desired level.
Here is a great site with some valuable info concerning greenhouse temps:
https://www.doityourself.com/stry/how-to-control-your-greenhouse-climate
Get a computer fan or two least a 30 watt solar panel and that with small 7amp 12 volt battery be enough to move the air with no extra cost or AC lines to a greenhouse that's small. If add 2nd battery and take solar up to 75 to 100 could also get raspberry pi or aurindo project or two going on water sensors and water flow control. Get your kids or grand kids to help you out as learn useful skills in electronics and programming.
Here's a good video tutorial: https://www.youtube.com/watch?v=UiIPkcyq95A