Hebe ‘Grethe’ (syn Hebe ‘Addenda Grethe’) is small, evergreen, bushy shrub which grows to a height of 24–32 in (60–80 cm). It has glossy green, broadly spear-shaped leaves. Spikes of purple flowers are borne in summer and early autumn, and possibly again in winter.
This hebe cultivar needs a sunny sheltered site in a well drained soil. Hardy to –6°C. Addenda® is a brand name used for all hebe varieties produced at Gartneriet Kjærgårdsminde in Denmark.