Overview
Cinnamon Bells (Gastrodia sesamoides), commonly known as the Potato Orchid, is an extraordinary, non-photosynthetic terrestrial orchid native to the lush damp forests of southeastern Australia. Devoid of leaves and lacking chlorophyll, this botanical curiosity lives almost its entire life hidden underground as an edible, potato-like starch tuber. In spring and summer, it thrusts a tall, chocolate-brown flowering scape into the forest air, bearing nodding bell-shaped blossoms that exude an intense aroma of spicy cinnamon.
Biology and Physical Characteristics
The morphology of Gastrodia sesamoides represents an evolutionary shift toward complete obligate mycoheterotrophy. The plant possesses no green foliage, reducing its leaves to small, scale-like brown bracts along a smooth, erect, fleshy scape that can reach up to thirty inches in height. The inflorescence carries between five and twenty nodding, bell-shaped flowers. The sepals and petals are fused together into a tubular five-lobed perianth that is rich cinnamon-brown or olive-brown on the outside and pure waxy white on the inside, with a small, ruffled, yellowish labellum nestled within the tube.
Behavior and Ecology
Because it possesses no chlorophyll, Cinnamon Bells cannot manufacture sugars through sunlight; instead, it derives all of its water, carbohydrates, and mineral nutrients parasitically from subterranean wood-rotting fungi (particularly species in the genus Armillaria). The fungal hyphae invade the orchid’s thick underground tuber, where the plant selectively digests the fungal tissue to absorb stored energy. Pollination is carried out by native sweat bees and hoverflies attracted into the bell-like floral tubes by the rich, spicy fragrance of sweet cinnamon and brown sugar.
Conservation and Human Impact
Evaluated as Least Concern, Gastrodia sesamoides is widespread and common in mature wet sclerophyll forests and fern gullies throughout eastern Australia. Historically, the large underground tubers were harvested as a roasted delicacy by Indigenous Australians, tasting similar to roasted sweet potatoes. Because the species requires deep, undisturbed rotting leaf litter and mature fungal mycorrhizae, intensive clear-cut logging and mechanical topsoil disturbance represent the primary localized threats.
Interesting Factoid
This orchid has completely discarded photosynthesis and has no green leaves at all: it lives off underground fungi that decay dead wood, emerging only to produce fragrant brown flowers that smell powerfully of cinnamon.
Last updated: October 2026