A succession of violet labiate flowers in long slanting racemes in late summer and autumn - really glows in the autumn light. The foliage is unusual in shape and takes on dark tints as the season progresses. Best in semi shade and not too dry and the stems are brittle so avoid exposed sites. Late to emerge in spring.
Persicaria sp. Indian Summer
A popular species lately with rich pink flowers and dark tinged heart-shaped foliage. A lovely contribution to the late garden scene. Not even slightly invasive, with a compact root system
Sometimes labelled B.tricuspida, a subtly lovely (non-stinging) nettle relative adding mellow autumnal colours to the border or woodland garden. Lush jaggedly cut leaves, pale catkins and red stems.
Tubular pink flowers more like a Penstemon (some of which used to be classified as Chelone - hence the name) and foliage that reminds me a bit of a Hydrangea. This is a rhizomatous perennial, spreading steadily but not in a bad way. Usually grown as a woodlander (where it is admirable) but adaptable, and flowering over a long period into autumn.