Hebe buchananii is variable in the wild. Its height may be between 1.2 in (3 cm) and 12 in (30 cm). There are a number of forms in cultivation. The evergreen leaves are green or green-blue, broadly spear-shaped, 0.15–0.25 in (4–6 mm) long. Some forms can be shy flowering. White flowers in late May and early June.
It is named after John Buchanan, a Scotsman who botanised in New Zealand and Campbell Island. Hebe buchananii is found in the South Island mountains, from Canterbury southwards. It is closely related to Hebe pinguifolia.