Agapanthus campanulatus is a clump-forming perennial, growing 0.4 to 1 m tall. The slender, glossy green or greyish-green, strap-like leaves narrow to a distinct purplish stem-like base and it produces 6-12 leaves per plant. Umbels of 10 to 30, pale to deep blue flowers with a darker blue stripe are presented on a long flower stalk in mid- to late summer. Even the anthers are blue.
Agapanthus campanulatus is a dainty deciduous agapanthus from the Drakensberg and a good choice for gardeners in cold areas who struggle to grow evergreen agapanthus.