Tee Gee, is your greenhouse heated? I have no electricity to mine and I don't want to fiddle with paraffin heaters.
I have all my seedlings indoors and they grew leggy so I have potted them on deeply so the leaves are now just above soil level. They are mainly tomatoes, chillies and pepper plants. However, because I have put them from large pots into individual ones, they are taking up far more room and I have now filled all the available space indoors. I have grown many more than I need as when frost is no longer an issue, I can put some on a table, set up in the village, where people put their excess plants or produce for sale and the proceeds go to cancer research.
Do you think they would survive in the unheated greenhouse if I put them in flat polystyrene boxes and covered them with fleece? I also have propagation trays with transparent lids so I could put some in those and cover with fleece. I want to get some bedding plant seeds sown too, so if the toms could go in the gh, I would have room for more seeds indoors.
The alternative is that I could put an extension lead from the summerhouse to the greenhouse and then stick a fan heater in there, but I am not sure that it is a good idea to have an extension lead out in all weathers.