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!