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.