Penstemon Thorn 08-01-2019DianeComments are closed Like most penstemons, Thorn is an excellent garden plant. It is easy to grow, attractive for most of the year and flowers generously. Native bees and birds love it. Perennial with white tubular flowers with pink tips. Category: Penstemon Related products Penstemon Alice Hindley Penstemon Snowstorm Penstemon Blackbird Penstemon Garnet