Plants grow very slowly when its cold. So if you want yo grow something in a greenhouse in the the beginning of february two solutions : warm it or use a greenhouse inside the green house.
A minute project to create a very small greenhouse with an 8 liters water fountain.
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Step 1: The Top
What you need : a water fountain and a good knife.
Cut the tap, then the top
Step 2: Bottom and Finish
cut the bottom, put some ground , water and seeds : finished.
Due to the shape, when the weather is cold the dampness condensate on the top part and get down to the the ground so it uses very little water : 2 cl a week.