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hoefla
This might be an obvious question but I can't work it out. What's the warmest temperature that you can still get a plant killing frost at, and how much will a mini greenhouse reduce this to? As in can it be 0 outside but still no danger to plants in a mini greenhouse?
I have just stuck some sweet pea and digitalis seeds in a mini greenhouse in my quite sheltered urban garden. Hoping they will be fine from now on - I read something about sowing them early meaning that they'll be hardier than if you sowed them later or indoors, they get a bit spoilt that way...