Allotments 4 All

I have one of there three tier small greenhouses covered in plastic. How much warmer will this keep plants?

I have things which need to go out (like my squash!) but it is still too cold. So how much of a difference in temperature does a greenhouse make? For example, can I put my plants out in 10 degree weather if they need 12?

Difficult to say.

I have a minimum -maximum thermometer in my mini greenhouses, which are still inside my big greenhouse which is otherwise unheated. In there, they have been staying at 10 degrees, occasionally as low as 5 but I then use fleece over the plants as well. You should get a few degrees warmer, but watch out for overheating past mid morning, mine are reaching 25 degrees if I'm not quick enough to unzip the plastic covers!