Collects and shares details on species identification, propagation, successful growing methods, and native locations. Includes images and library.

Gives details of the penstomon plant, with growing and propagation information.

Offers common name, zone, native range, size, bloom time, sun and water requirements, culture, noteworthy characteristics, and problems.

Discusses common name, preferred conditions, appearance, special features, site selection, planting instructions, and care.

Personal website of Bob Davies aimed at fostering interest and appreciation of penstemons in the United Kingdom.

Features overview, characteristics, requirements, fertilizing, light, watering, planting, problems, and how to cut flowers.

Looks at three of the penstemon varieties - P. cardwellii, P. deustus, and P. venustus. By Andrea D. Wolfe.

Penstemon is a native American genus of wildly varied, flowering perennials. Gives an overview of the plant along with photos.

Explores the penstemon seed germination methodology. Details on the prescribed germination environment for each variety.

Reviews native California species, with preferred conditions, appearance, and images.

Information from Better Homes & Gardens includes requirements, appearance, uses, special features, top varieties, compatible plants, and propagation.