I was quite lucky over the winter term with my penstemons. They all survived however some of them were planted behind some delphiniums which shaded the penstemon too much and they grew very spindley and didn't do well at all!
I've never lost Penstemons in the winter... and yet I've lost quite a few other plants. Must say also the P. Garnet is a tough guy. Planted 3 specimens almost 20 years ago, moved them a few times, made cuttings, etc. Still looking beautiful.
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Yep, plastic pots and plastic bags, so fingers crossed! My cuttings are Raven, but I do have Garnet in the garden, too.