The simple, opposite leaves of Delosperma ashtonii are flat and stem-sheathing, oblong to ovate with entire margins and pointed tips. The green blades are succulent and hairy, keeled on the outside.
Leaf dimensions are about 45 mm long, 12 mm wide and 4 mm thick (Pooley, 1998; iNaturalist; https://www.researchgate.net; https://www.worldfloraonline.org).