Aptly named, Aubrieta cultorum 'Cascade Purple' produces masses of bright purple flowers from early spring onwards to form a waterfall of colour. Aubretia has a spreading, mat-forming habit and is ideal for growing in rock gardens, wall crevices, patio containers or dry sunny banks. Easy to grow, this hardy evergreen perennial is also excellent for bees and butterflies. Height: 10cm (4). Spread 40cm (16).