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Penstemon 'Sweet Joanne'--overwintering?

I just planted a few Penstemon 'Sweet Joanne' in full sun and well draining soil. For those of you who grow it, how did it overwinter for you?

I am just checking whether this will be a pretty annual or a reliable perennial.

By the way, I bought these from Bluestone last December or January when they listed this cultivar at 50% off. I got them for something ridiculous like $3.50 each. Ditto for Penstemon 'Dark Towers', although those were more like $4.50 each. The plants were delivered yesterday and they were absolutely huge and healthy. The new Bluestone rocks!

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