salvia x superba or salvia nemorosa 'marcus' with stunning, vertical spikes of rich, violet-blue flowers

marcus salvia nemorosa superba attractive awardwinner bloom blooming blue botanic botanical botany close closeup dark detailed flora floral flower flowering flowers foliage garden gardening glowing growing growth leaves macro nature ornamental outdoors park parks petals plant purple rich spikes spring stems stunning summer unique vegetation vertical violet 'marcus' violet-blue