Plants single or dividing to form small groups.  They are long-lived perennials. The roots are succulent and about 2.5 mm  in diameter.

The leaves are at first ascending, becoming spreading, spear-shaped and in dense rosettes, faintly white-spotted. It is 165–230 mm long, 60–65 mm broad at the base and slightly sickle-shaped. The upper surface is channelled at the base, the lower surface convex and with a distinct eccentric keel. Both surfaces are dull green and smooth. The margin is leathery and with very small serrated teeth and sometimes entire. The leaf tip ends in a short sharp point (mucronate). The juvenile leaves are tongue-shaped and with the same texture as the adult leaves.

The inflorescence consists of a flat-topped panicle up to 1150  mm long and with up to 6 branches, but  younger plants bear an unbranched raceme. The inflorescence stalk can be up to 330 mm long. The flowers tips all point in the same direction (secund) and up to 6 flowers open at the same time. The flowers (perianth) are dark pink, pendent, tubular19–27 mm long, curved in the middle and the 6 floral segments fused for their greater length. The floral tips are free and white with a median green stripe. The flower bracts are 6–7 mm long. The flower stalks are also pendent and about 4 mm long. Each flower has 6 stamens, the yellow anthers just protruding at the floral mouth.

Gasteria loedolffiae flowers in the summer months (January to February in the southern hemisphere).