Salvia x sylvestris 'Schneehugel' (Wood sage)
'Schneehugel' is a clump-forming herbaceous perennial with oblong to lance-shaped, scalloped, grey-green leaves and thin, erect racemes of small, white flowers in summer.
Plant in light, moderately fertile, moist but well-drained soil. Grows best in full sun but can also tolerate part shade. Will reach a height of 0.5m and a spread of 0.5m after 2-5 years.