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4

I live in Wisconsin, where we also plant when the temps can get below freezing, and I think that you're right to be concerned - 9 F is awfully cold for your plants—according to this sustainable farming site, it's just below the lowest temperature spring peas can stand without being killed. Assuming that you have a typical garden-sized row or rows of peas, ...


2

The green parts of that plant are dead. Only time will tell if the roots have enough energy reserves to regrow, but it's not likely. A perennial that has its top killed by frost may regrow from the roots, but annuals usually don't have the stored reserves to allow regrowth. I would leave the top until it dries out, then remove it by breaking or trimming it ...


2

You should remove it during the day; unfortunately, UK temperatures tomorrow are set to drop but hopefully not to below 5degC during the day where you are; unless you're growing something really tender, it's best to allow daylight to get to the plants. Replace the cloche after 3 or 4 pm for the time being until the weather's warmer, then you can replace it ...


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