Beneath the surface: The race to save the world's rarest orchid
In a remote corner of Australia, a tiny, elusive orchid lives deep in the earth, hidden from view. This extraordinary plant, known as the Western Australian underground orchid (Rhizanthella gardneri), is one of the planet's most endangered species, facing extinction due to habitat loss and climate change. Scientists worldwide are racing to preserve it, as its survival depends on a delicate balance between nature and human intervention.
For decades, Kingsley Dixon, a botanist and advocate, has been obsessed with this rare plant. As a child, he was captivated by a book titled Orchids of the West, which detailed the wild orchids of Western Australia. One illustration in particular, an ink drawing of the underground orchid, left him spellbound. He later discovered that this orchid, which lacks leaves and roots, thrives in darkness, blooming with vibrant flowers that defy the odds. Dixon recalls, "From the time I was a child, I would just stare at this page and think: 'Oh my, there's an orchid that lives underground, it doesn't have leaves or roots, and it has this amazing flower!'"
Dixon, who grew up in Perth and spent years exploring the Australian bush, became a passionate collector of orchids. By age 13, he had amassed a collection of bush orchids, but the Western Australian underground orchid—known for its mysterious life cycle—was his dream. He once saw a preserved specimen in a jar during a herbarium visit, but only after years of searching did he finally spot one in the wild in 1982. During a field trip to Babakin, he stumbled upon a hidden patch of soil, revealing the orchid's colorful bracts. That moment, he says, was a "Eureka moment."
Today, the underground orchid is critically endangered, with only a handful of surviving plants in the wild. Climate change exacerbates the crisis, as rising temperatures and frequent wildfires threaten its fragile ecosystem. Dixon, now a professor at the University of Western Australia and former director of the Kings Park and Botanic Garden, has vowed to fight for its survival. His new mission: to save this underground marvel before it vanishes entirely.
The orchid's survival hinges on a complex relationship with fungi. Unlike most plants, this species relies on a symbiotic partnership with a white, thread-like fungus that connects it to a nearby Melaleuca uncinata bush. This fungal network transfers nutrients from the bush to the orchid, enabling its growth in the dark. Such relationships, called mycorrhizal associations, are common in orchids, according to plant ecologist Jacopo Calevo. However, the underground orchid's dependence on both the fungus and the bush makes it particularly vulnerable to environmental stressors.
Calevo explains that while 80-90% of land plants form such partnerships, orchids are uniquely reliant on fungi for their entire life cycle. Without fungi, orchids cannot germinate or survive, as they depend on these microscopic organisms to transfer essential nutrients. "Fungi are pivotal for orchid germination," Calevo states. In 2025, a study found that wildfires, which are becoming more frequent due to climate change, could devastate orchid populations. For example, the fire orchid (Pyrorchis nigricans) thrives in post-fire environments, while the blue sun orchid (Thelymitra macrophylla) is nearly wiped out in burned areas.
Kingsley Dixon and his team have studied the impact of a 2022 wildfire on the orchid, finding that the fungal community in the burned area was drastically different from pristine sites. While the fungi recovered within two years, the Melaleuca bushes were completely destroyed. However, the study suggests that controlled burns might eventually help restore the ecosystem. Yet, Calevo warns that if wildfires become too frequent, the beneficial fungi and bushes may not regenerate in time for the orchid to emerge from dormancy.
Dixon's work includes growing the orchid in a lab, complete with its fungi and Melaleuca bush, to ensure its survival. Despite setbacks, such as a 2000 incident where a watering schedule caused the plants to die, Dixon remains hopeful. He emphasizes that protecting remaining habitats and raising awareness about the orchid's plight is critical. At the 2025 Chelsea Flower Show, Dixon and other experts showcased a display highlighting the orchid's urgency.
The orchid's story reflects a global crisis: habitat destruction, climate change, and the lack of escape for endangered species. As Dixon notes, "There's nowhere to go, because it's turned into a suburb, a highway, a farm—clearing, gone." The race to save this rare plant is a testament to humanity's struggle to coexist with nature, and the hope that science and conservation can still offer a future for this remarkable organism.
