Keiskea are from Japan and make extremely pretty bushy herbaceous perennials to about 2ft tall. The pink is very pale so the flowers shine out against the dark tinted foliag.
Plants that flower late into autumn are always worth having and there are a number of late season Lamiaceae (mint family) from eastern Asia that are far too little grown in the UK. Colquhounia, Elscholzia and Rostrinucula are three that I grow, and this is another.
Adaptable and completely hardy, but possibly at their best in coolish, moistish spots.
2L pots ~ £9