Hebe gracillima is an upright, open, evergreen, bushy shrub, which grows to about 4 ft (120 cm). The green, narrow spear-shaped leaves are about 1.5 in (4 cm) long. The flowers are white; summer.
This hebe is found damp places near Westport on the west coast of the South Island, New Zealand. It is a hebe fairly hardy in the UK. Recent research has subsumed this species with Hebe leiophylla.