I grow a lot of Penstemons east of the house; they are so lovely and charming when they bloom in late spring, and there are several different species that like conditions spanning wet to dry.
Gulf Coast Penstemon is one of those penstemons that tolerates wet conditions, although in my garden it doesn't live very long. Usually once it's flowered and the seed is ripe it's gone. Well worth keeping going from seed for its magical colors, pink in bright daylight and electric lavender at twilight.
I wanted to add Smooth beardtongue to my garden after seeing it at the Mason Farm Biological Reserve, which is in the floodplain of the Haw River. (Disclaimer: I am never sure whether I'm looking at P. laevigatus or P. digitalis, or how much of a difference there is between the two.) These white-flowered penstemons have lasted in my garden up to 5 years.
The penstemon below is like Gulf Coast Penstemon ~ beautiful, changeable in the light, tolerant of periodically wet feet, and short-lived. It looks like Eastern Gray Beardtongue may be one its parents.
I've posted about 'Midnight' many times. According to Annie's Annuals it is P. x gloxinoides, which is a European hybrid. Unlike my other penstemons this one actually forms a small shrub and doesn't set seed. All it asks for is good garden soil. It even reblooms some in summer and fall.
Eventually I'd like to back off so much seed starting, but I always plan on starting beardtongue from seed every year, as well as foxglove and whatever natives I've chosen from the NC Botanical Garden.