American Penstemon Society
Collects and shares details on species identification, propagation, successful growing methods, and native locations. Includes images and library.
Looks at three of the penstemon varieties - P. cardwellii, P. deustus, and P. venustus. By Andrea D. Wolfe.
Explores the penstemon seed germination methodology. Details on the prescribed germination environment for each variety.
Plant Encyclopedia: Penstemon
Information from Better Homes & Gardens includes requirements, appearance, uses, special features, top varieties, compatible plants, and propagation.