An upright, borderline hardy, woody, deciduous to semi-evergreen perennial or subshrub with aromatic, elliptic to broadly lance-shaped, often toothed, softly hairy, mid- to bright green leaves and, from midsummer into autumn, open whorls of tubular, two-lipped flowers with violet-blue upper petals and paler lower petals.
Height 1m (3ft), Spread 60cm (2ft), 5-10 years to maturity.