Ligustrum robustum grows as a shrub or small tree up to 10 m (30 ft) tall though old specimen of more than hundred years have been observed with a height of 15 m (50 ft). The fruit is an ellipsoid berry, bluish-purple, 7–10 mm (0.28–0.39 in) × 4–5 mm (0.16–0.20 in).