The slightly down-curved spur at the back of a Disa hallackii flower hood is cylindrical and greenish, thickish at its tip. It becomes about 5 mm long.
The straight bracts are taller than the flowers, typically hiding them partly. The bracts are not reflexed, but sometimes slightly out-curving towards their tips. The bract margins may be red with red spots sparsely scattered on the green surfaces; in picture only some bract tips are discoloured from becoming dry.
The large, cylindrical D. hallackii inflorescence becomes from 10 cm to 35 cm long, densely covered in flowers and bracts. The flowers exude a spicy scent.
Flowering happens in the later part of spring (Liltved and Johnson, 2012; Privett and Lutzeyer, 2010; iNaturalist).