The flowers of Disa graminifolia are blue or violet and sweet scented. Two to six of them are usually borne in a loose spike. The upper or median sepal topping the flower, has elegant curvature to an acute tip. The lateral sepals are similarly coloured and large, positioned lower than the flower centre. The small lateral petals, dark blue, white and purple in colour, can be seen inside the hood, next to the white column and topped with kidney-shaped, green sections. Each flower has one small, club-shaped spur at the back of the hood, not more than 4 mm long.
Flowering happens from midsummer to early autumn (Bean and Johns, 2005; Manning, 2007; iSpot).