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Can I save frost-killed tuberous begonias?

We had frost Sunday night, at least 2 weeks earlier than normal. I have numerous tuberous begonias in hanging baskets and pots. They now have limp and soft leaves and stems. Most still have some healthy leaves below but not all. It was not a hard frost: just enough to zap the tenderest plants like the dahlias, begonias, and callas. Most are the large leafed hairy kind (not Rex, just tuberous) but one is an angel wing.

Can I still save the begonia tubers? Last year I brought them in about this time in October, waited for them to decline, stopped watering, then dug up the tubers after the stems dropped off. I had really good luck, for the first time. Should I do the same now? (Though this time there will be no waiting for their decline!) Or will the shock have killed them? Thanks!

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