Salvia gauranitica ‘Black and Blue’
A subshrubby perennial which has branched, dark green stems and ovate, pointed, slightly toothed, hairy, wrinkled, mid-green leaves. From August to October 30cm long upright spikes bear rich blue flowers, which are held at their bases by near-black calyces.
Grow in light, moderately fertile, humus-rich, moist but well-drained soil in full sun or light dappled shade. Mulch in winter to protect it from frost. It will reach a height of 2.5m and a spread of 90cm.