It has a single tubular, bright green leaf and up to twenty five relatively large, green to light greenish-brown flowers with white petals and a large white labellum.

Prasophyllum tunbridgense is a terrestrial, perennial, deciduous, herb with an underground tuber and a single bright green, tube-shaped leaf which is 200–300 mm (8–10 in) long and 4–6 mm (0.16–0.24 in) wide with a purplish base.

The flowers are 7–9 mm (0.3–0.4 in) wide and as with other leek orchids, are inverted so that the labellum is above the column rather than below it.

Flowering occurs in October and early November, more prolifically after earlier fires.

[2][3][4][5] Prasophyllum tunbridgense was first formally described in 1998 by David Jones from a specimen collected in a nature reserve near Tunbridge and the description was published in Australian Orchid Research.