This one of the reasons why we chit, we get them going inside whilst the freeze is going on outside, then similar to you I plant 6 - 8 inches deep then hill up, but I do that straight away. I would have all growth underground rather than letting the tops get frozen and blackening. That would set growth back a couple of weeks as those tops recover and regrow.I have had up to three freezes once on the same crop with above ground tops and they survived but did have somewhat lower production. In a good year,
If you have eaten Sarpo Mira potatoes before, the very best of luck; if you have not, throw them away and get some decent seed potatoes.
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