Babiana grandiflora is a perennial plant of 8–14 cm (3.1–5.5 in) high that emerges at the start of every growing season from an underground corm.

It can be distinguished from other species of bobbejaantjie mainly by its very large, mirror-symmetric deep to pale bluish flowers near the ground.

It also has very short filaments crowded near the dorsal tepal, resulting in the anthers being largely hidden within the floral cup of the funnel-shaped perianth.

Each stem carries 2-5 deep to pale blue mirror-symmetrical flowers with markings, set in a decumbent spike.

The 3 stamens are hairy at base, crowded near the dorsal tepal, having arched filaments of about 10 mm (0.39 in) long, reach slightly beyond the upper part of tube.

[1] Babiana grandiflora together with B. ambigua, B. petiolata and B. nana consistently have a poorly developed collar of fibres around the underground part of the stem.

Babiana grandiflora is much alike B. nana but differs in having narrow, erect leaves covered with short, velvety hairs and mostly unbranched spikes at ground level bearing 2-5 flowers.

[1] As far as we know, specimens of this species were for the first time collected for scientific research in 1962 by the Swedish botanist, Bertil Nordenstam, 3.5 km east of Kotzesrus along the road to Garies on the coastal plains of Namaqualand.