About ten Haworthia blackburniae leaves grow from the short stem. They are hard and grass-like, erect when young, spreading with age. The linear blades are smooth, channelled on their upper surfaces and keeled below. The margins are minutely toothed, the teeth triangular.
The leaf dimensions are up to 20 cm long and 5 mm wide (Vlok and Schutte-Vlok, 2015; Scott, 1985; iNaturalist).