One of the best shade perennials - pairs well with Hosta - try Allium. Various sizes (these ones are GIANTS). Of the onion family - bulbs. Slow multiplier, but oh so dramatic! Blooms spring/summer then dies back. Beauty wants these/ like dr Seuss plants!
Sedum ‘Autumn Joy’ -- Another great choice for late summer flowers and winter texture. Its flowers bloom from August into November; they open pink and mature to a copper befitting of autumn. It is 2 feet tall and wide, with succulent stems and leaves.
Schizostylis the Kaffir Lily. It is native to South Africa and is great for late season colour in the UK flowering from end of September to November --- Flower possibility for African/flower motif, right arm