Syn. S. attenuata

Shrubby perennial. Fully hardy, erect, branching perennial with long-stalked, ovate, toothed, dark green leaves.  In summer produces dense spikes of tubular, indigo flowers, 4 cm long.  Prefers full sun or partial shade, in light, fertile, free-draining soil.  Fully herbaceous in hard winters. 

Height 120cm Spread 100 to 150cm

4 litre pot.