deep purple African daisy

O. ecklonis is an erect or spreading evergreen shrub or subshrub, up to 1m high, with aromatic grey-green leaves, up to 10cm long, which may be linear-oblong, elliptic or lance-shaped, and entire, partly or wholly toothed, and flowerheads, 5-8cm across, with dark blue disc florets and ray florets which are white above and indigo below, throughout the summer