Rhizanthella is one of the world’s most remarkable orchids—an elusive plant that spends its entire life beneath the soil. Lacking leaves and unable to photosynthesize, it survives by drawing nutrients from a symbiotic fungus, which in turn connects with the roots of the broom bush (Melaleuca uncinata).
First discovered in 1928 by a farmer ploughing a field in Western Australia, Rhizanthella immediately captured global attention. Nearly a century later, it remains extremely rare and difficult to locate. Botanists must search for suitable habitats and gently scrape away soil to uncover its hidden clusters of small reddish flowers, encased in creamy-pink bracts. Despite growing underground, the orchid produces a strong vanilla-like scent that may attract pollinators such as termites or tiny flies.
There are only five known species of Rhizanthella, all among the rarest orchids on Earth. Their survival is precarious, threatened by habitat loss, prolonged drought, and the effects of climate change.
To prevent extinction, botanist Kingsley Dixon from the University of Western Australia is leading efforts to conserve the species. His team is cultivating the orchid’s essential fungus alongside its seeds in laboratory conditions before transplanting them into potted Melaleuca bushes—an innovative approach offering new hope for this extraordinary underground orchid.
