Penstemon “Enor” is our latest of the Beardtongues. It has a particularly deep purple colored flower and particularly deep green colored leaves. It’s a very hardy and robust Penstemon that won’t look ratty through half the summer. Hardy down around 10F. Maybe down to 0?
They do need full sun and a fast draining soil, but you knew that. They will keep blooming starting around this part of summer and all the way into the late fall, at which point you can cut them back, but you should still have some nice green foliage through the winter.