Penstemon
Herbaceous cultivars of Penstemon have enjoyed varying fortunes since the nineteenth century. Happily, they are again enjoying a resurgence of popularity, well-shown by the latest trial.
Information on growing penstemons
RHS trials
Following trials held in 1910 and 1931, the most recent trial of taller, border Penstemon cultivars concluded in 1993. As a result, 20 cultivars were recommended for the Award of Garden Merit. The Trial also permitted the resolution of some nomenclatural problems in the genus, and resulted in the publication of a key to the cultivars represented in the Trial.
Dwarf Penstemon suitable for the rock garden were the subject of a trial between 1994-1997, with two Awards of Garden Merit added to the six already held by dwarf types.
Penstemon cultivars (tall, border types): key and descriptions
The Award of Garden Merit
Further reading
This is just one topic covered by the Society's monthly journal for members, The Garden, and recent articles of interest are listed below.
Elliott, J. & S. Thornton-Wood 1997, September. Dwarf Penstemon. The Garden (RHS) 122(9): 652-655.
Lord, T. 2000, May. AGM Plants: Penstemon 'Andenken an Friedrich Hahn'. The Garden (RHS) 125(5): 376.
Lord, T. 1994, July. Peerless penstemons. The Garden 119(7): 304-309.