'Autumn Joy' Sedum - a true garden classic. Tip: pinch off heads in June produces smaller (and more) florets and keep stalks upright.
Lamium orvala Not the familiar ground cover lamium, but a clump forming, non-invasive dead nettle with lovely pinkish-purple flowers in early summer. Ideal for a woodland garden. Height 60cm. Beth Chatto garden nursery
Libertia grandiflora - Full sun or light shade in fertile, well drained soil. Flowers May to July. HxS 90x60cm. Selectively cut out old foliage to reveal attractive new growth. Dislikes a waterlogged soil. Divide congested plants in spring or autumn. Leave flower spikes to mature and form attractive seed heads which will self-seed if permitted.