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There are ways to extend your greenhouse time though...You could double wrap your polytunnel.Pretty mixed results here for sure but a person just has to give it a try :smoking:. Was 41F overnight in the greenhouse but it looks like we get a day and a half of sunshine
After you installed the first layer of poly stick swimming pool noodles on top of the poly where the frame is, leave 5cm/2" gaps between the noodles. Use contact glue for this or worst case tape to fix them to the greenhouse. Next, place second layer of poly plastic on top and tighten like a greenhouse should be. You should be able to play the drums on it. And if you have to do it in the cold or during wintertime, place a small heater inside the greenhouse while you are doing this. As soon as the poly cools down it tightens even more. Inside the greenhouse, install a small fan into the first layer of poly and let it run. Now your greenhouse is actively isolated and all it costs is the power to run the fan. You can do it without the fan, but it won't be as efficient as with.