Salvia nemerosa MARCUS (syn. ‘Haeumanarc’) – This Flowering Sage is a sport of ‘Ostfriesland’ that was discovered in Germany. It features spikes of deep violet-blue flowers (from June to September) that attract both hummingbirds and butterflies. It is a compact cultivar with fragrant (sage scented) deep green foliage. Deer resistant. Grows 10-12″ high by 12-16″ wide. Zone 4.
Pulsatilla vulgaris (formerly Anemone pulsatilla) – Pasque Flower is an old-fashioned cottage garden favourite and an RHS Award of Garden Merit winner. It bears large (1.5″ wide) nodding blooms of violet-purple (occasionally white) from March to May. These are nicely contrasted by the ferny greyish-green basal leaves. Grows 6-12″ high and 12″ wide. Hardy to zone 3.
Iris germanica ‘Orinoco Flow’ (Bartlett 1993) – An RHS Award of Garden Merit winning German Bearded Iris with white standards and falls that are generously edged in a deep violet-blue. The flowers are also sweetly fragrant. Plant with the top of the rhizome being just above soil level. Makes a stunning cut flower. Part to full sun. Grows 25″ high by 18″ wide. Zone 3.
Scuttuleria baicalensis – Baikal Skullcap is an herbaceous perennial that bears racemes of purplish-blue helmet-shaped flowers from early summer through to autumn. This native of China and Japan has hairy lance-shaped mid green foliage and the roots are an important component of traditional Chinese medicine. Part to full sun. Grows 8-12″ high and wide. Zone 5.
Agastache ‘Purple Haze’ – This Anise-Hyssop features licorice scented bluish-green foliage. It is long-blooming with smokey violet-purple flowers produced on tall spikes from July to September. It is highly attractive to both butterflies and hummingbirds. Best grown in full sun with adequate soil drainage. Grows 2-3′ high by 1-2′ wide. Hardy to zone 6.