Penstemon grandiflorus has large lavender or pink flowers. The blue-green leaves are shaped like shells. Native to the Great Plains.
This is one of the hardiest and showiest penstemons. It is relatively easy to grow, tolerating more moisture than most species. Of course, it still needs well-drained soil, and it may require staking in wet weather because the flowering stems are heavy. Also known as Penstemon grandiflora or Large Flowered Penstemon.