Many of the garden colour cultivars are the hybrid, P. cobaea × P. hartwegii, sometimes listed under P. ×gloxinioides hort.
Records of cultivars are improving but many have unknown origins.Most of the blue-flowered cultivars are derived from P. heterophyllus and these would include P. 'Blue Spring'.
Available but without description are: P. 'Barbara Barker', P. 'Crimson Robe', P. 'Stapleford Gem', P. 'Swan Lake', P. 'Thorn' and P. 'White Bedder'.
Flowers pale blue-violet, suffused with white and with a white throat.
Penstemon 'Andenken An Friedrich Hahn'
Plant to about 1m tall. Flowers large, bell-shaped, purplish with no white in the throat, long-flowering. [P. 'Garnet']
Large, delicate pink and white blooms, possibly incorrectly known as P. 'Beech Park'.
Flowers small and pink.
Originated in at least 1949 from the Slieve Donnard Nursery, Northern Ireland.
Flowers dark red with a trace of white in the throat.
It is uncertain whether this plant is synonymous with P. 'Schönholzeri' or not.
To about 70 cm tall, with flowers deep blue-purple.
A mat-forming cultivar of P. rupicola.
Large, deep red flowers with pure white throats.
Flowers lavender.
P. rupicola cross raised by Mr Elliott at the Six Hills Nursery, Stevenage, Hertfordshire, UK.
Flowers white.
