By Robert Nold
With a few 270 species, Penstemon is the biggest genus endemic to North the US, with examples to be present in each nation within the continental U.S. Penstemons are really loved by way of rock gardeners, yet as Panayoti Kelaidis issues out in his foreword, they belong in each backyard, seeing that "one penstemon or one other will thrive in almost any microclimate a backyard can contrive, from scorching, wasteland exposures to dank shade."