Drimia loedolffiae is an evergreen bulb, which divides, forming dense, rounded clusters, up to 150 mm in diameter and consisting of up to 15 bulbs. The bulbs grow above the rocky substrate, sometimes half submerged. The mature bulb is egg-shaped to rounded, 40–45 × 25–50 mm, each bulb with up to 3 or 4 leaves. The outer bulb scales are greyish white, papery, exposing purplish green inner bulb scales. The leaves are soft and flaccid, linear, rounded and tapering towards the apex, 200–260 × 1–4 mm. The leaf surface is faintly striped, bright green, withering from the tip.

The inflorescence consists of a raceme, 350–400 mm long, initially erect, becoming spreading. The flowers are about 1–3 mm apart, densely arranged at the end of the stalk. The flower stalk (scape) is rounded and 200–270 mm long, 1.5 mm in diameter. The racemes are 60–65-flowered, 120–150 mm long, with triangular bracts, 2 × 0.5 mm, each bract with a spur up to 4 × 1 mm. The flowers are small and cream-coloured and 12 mm in diameter, on flower stalks, 1.5–2.5 mm long, enlarging to 4–5 mm in fruit. The flowers are regular and the petals on one plain, linear-elliptic, about 5.0 × 1.5 mm, with dark brownish median stripe on the lower surface. Stamens 2.5 mm long; filaments linear and the anthers (male portion) 1 mm long, with yellow pollen. The tiny ovary is egg-shaped and 3-lobed, tapering, with a short style, 2 mm long. The fruiting capsule is egg-shaped, 5.0 × 2.5–4.0 mm. The seeds are flattened and sickle-shaped, 2.5–3.0 × 1.0–1.8 mm, black. Flowering time is summer, from October to February, with flowers opening late in the afternoon.