Penstemon

Penstemon (Beardtongue) is a very large genus with a lot of genetic diversity. Different species can be found across the U.S. and Mexico, and are known for being heat and humidity tolerant. One of the more interesting developments for penstemon has been in the Penstemon digitalis class. ‘Blackbeard’ is an example of an improved dark foliage penstemon with lilac purple flowers.