Perennials: Penstemons, 1 by Leftwood

Leftwood wrote:
Penstemon species and cultivars cross very easily within same sections of the genus. If you are collecting seed, you may not be harvesting what you think. According to the experts, crosses usually result in drab and uninteresting results.

P. digitalis and P. barbatus are probably the most "regular" garden amenable of the species, with P. hirsutus next up. Most others need very good drainage, lean soil (not rich), full sun and heat. Lacking these requirements contributes to short lives, although many species are naturally short-lived anyway.

Penstemon grandiflorus