Now I know – it’s Salvia forskaohlei – and Balkan, not Bulgarian…

orskaohlei…Salvia forskaohlei (Forskahl’s Sage) (Indigo Woodland Sage)

The large, almost triangular leaves of this Balkan native make a striking base for the long spires of white-streaked, violet-blue blooms where robust flower stems arch gracefully above the basal foliage, lying close to the ground.

for more reading….

http://www.worldofsalvias.com/gallry12.htm

http://www.telegraph.co.uk/gardening/gardeningadvice/10986782/Dream-of-colour-Growing-salvias-is-the-answer.html

Favourite autumn flowering salvias