Overview
The Plumed Leek Orchid (Prasophyllum plumiforme) is an attractive and sweetly scented terrestrial orchid native to the granitic aprons and seasonally wet soils of southwestern Western Australia. Featuring an erect spike of non-resupinate, upside-down flowers adorned with delicately fringed, feather-like labellum margins, this species produces a spicy floral fragrance on warm spring days that draws diverse native insect pollinators.
Biology and Physical Characteristics
Prasophyllum plumiforme emerges with a single hollow, cylindrical, rush-like leaf that encases the developing flowering stem. As the inflorescence matures, the flower spike bursts through a slit in the leaf sheath, reaching up to 45 centimeters in height. The inflorescence bears a dense cylindrical spike of 10 to 35 small, sweetly perfumed flowers colored olive green to reddish brown. Uniquely for orchids, leek orchids possess non-resupinate flowers, meaning the labellum is positioned at the top of the flower rather than the bottom. In P. plumiforme, the labellum is distinguished by its dramatically plumed, silvery-white crystalline fringe of hair-like cilia.
Behavior and Ecology
Flowering from August to November, Prasophyllum plumiforme is an active reward-producing orchid that secretes glistening droplets of sugary nectar along a raised channel on its labellum. Attracted by its spicy, sweet clove-like fragrance, a wide array of diurnal insects—including native thynnid wasps, hoverflies, and small solitary bees—visit the flower spike. As they lap up the nectar, their heads brush against the sticky viscidium of the column, picking up club-like pollinia to effect cross-pollination across neighboring plants.
Conservation and Human Impact
Prasophyllum plumiforme is categorized as Least Concern due to its vast geographic range and large, stable populations across national parks, nature reserves, and granite rock catchment areas. The species shows resilience to periodic bushfires, often flowering with enhanced vigor in the spring following an autumn burn due to reduced vegetative competition and nutrient enrichment from wood ash.
Interesting Factoid
Unlike most orchids whose flowers twist 180 degrees during development to place the lip at the bottom, the Plumed Leek Orchid’s flowers are non-resupinate—meaning its fringed, feather-like lip naturally sits on top of the blossom like a decorative crest.
Last updated: October 2026