Slender plant up to 60cm tall with radical (arising from the base of the stem), grass-like leaves that are dry at flowering. Inflorescence lax with 2-6 blue to violet-purple flowers, with petal apices often green and lip dark purple. The 2-4mm long spur is club-shaped. Flowers often sweetly scented. It is thought that the orchid is pollinated by carpenter bees which mistake the brilliant blue flowers for a source of nectar. This species can be confused with Disa purpurascens but can be identified by the club-shaped spur, down-curved lip margins and later flowering time.