Perennial starter 9cm sized pot.  Salvia atrocyanea is a hardy herbaceous salvia that has green foliage tinged with blue and produces deep blue flowers with green/blue tinted bracts in summer.  Reaches 1.5m+.  Winter dormant.  Likes a sunny position in well-drained soil.  Looks fantastic paired with perennial grasses, helenium, rudbeckia etc.