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Penstemon question

I planted some penstemon seeds last year and they grew well enough, quite happy little plants. Only small though so I decided to keep potted over winter, to plant out this year at some point. I have an established penstemon that is fine outdoors in winter so I figured they are fairly tough. I put them in a kind of cold frame, unheated but next to my house and I put some sheep wool over it when it was very cold. Anyway, I'm fairly sure they're all dead now. How should I keep them over winter if I try again this year? In the house?? I don't have a greenhouse.
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Try knocking one out and have a look at the roots, they may have just died back over winter. If there's some whiteish roots they may be ok.
Worth a look before doing anything drastic.
Billericay - Essex
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