Why is it in a greenhouse?They need plenty of moisture and I doubt it will be able to retain enough of it to be of any benefit if it's in there.
All my strawbs are in pots temporarily this summer so, as an experiment, I put a few in my mini greenhouse, which has been getting really warm most days!The three main differences have been:-- no damage to any of the GH fruit (there was some but not too much to those left outside).- the GH plants dried out quickly so I had to be on top of keeping them moist.- the outdoor plants seem to have sent out a lot more runners.Conclusion, I will be continuing with plans to put all my newly propagated 1st year plants in a strawberry and rhubarb patch but will pay attention to offering them more pest protection. They definitely prosper in the ground outside with little benefit to being under the cover of a GH.
I've never grown them undercover - completely hardy. They're probably frying in there.The only reasons commercial growers do it, is to get earlier crops, and to make it easier to prevent pest damage. They have suitable methods of maintaining them too