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Things like lettuce, chard, salad greens, spring onions, kale will grow happily without heating in the greenhouse. At most you may need a second layer if it's really cold, e.g. a layer of fleece, a cloche or a cold frame.
You probably won't be able to start seeds but you can start them off in autumn and they will grow when the days are warm enough through the winter.
You probably won't be able to start seeds but you can start them off in autumn and they will grow when the days are warm enough through the winter.
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