Sold in 1L pots. 
A really stunning salvia with slightly aromatic leaves. Produces deep purple flowers from almost black calyces during summer, right through autumn, up until the first frosts. Attracts bees. Can reach 4-5' in height in one season.
Care requirements: Requires a free-draining soil. Plant in full sun or partial shade, and in a sheltered location. Deadhead spent flowers to encourage continual flowering. A hardy perennial in milder locations, but you may wish to either mulch or pot up and store in a frost free location during winter.
Hardy, depending on location. Mulch well or dig up, cut back and overwinter in a frost-free location.