THREE PERENNIALS FOR HEIGHT
1 Rehmannia angulata (Chinese foxglove) Use this 50–75cm high perennial with its large, deeppink foxglove-like flowers as a tall groundcover to add colour to semi-shady areas; it will also grow in moist soil in sun. Propagate from root cuttings in autumn and young shoots in spring.
2 Agastache ‘Violet Vision’ Birds, bees and butterf lies love the 30–45cm high f lower spikes, which appear throughout summer. Both f lowers and leaves are fragrant.
It needs good drainage, full sun and tolerates dry periods.
3 Campanula latifolia (Canterbury bells) An old-fashioned, clumpforming perennial, it’s perfect for country gardens and English borders and shady woodland areas where its lavender-blue f lowers have a cooling effect. Cut back faded stems and divide in spring or autumn.