Australia contains beautiful beaches and reefs, but is perhaps most well known for the remarkable number of animals that can kill you. Snakes, spiders, crocodiles and sharks tend to dominate the headlines, but they aren't the only things to contend with as the plants can be just as lethal. If you've ever been on bush walk in northern Queensland, it's common to come across Australian government signs saying things like: "Don't touch the plants here, they will harm you. We care about your safety, but we are not responsible for it."
I first learned about one of Australia's most frightening shrubs not in Australia, but on the opposite side of the world, in Northumberland, at Alnwick's Poison Garden. The guide had a wonderful Geordie accent, and told us about the Gympie Gympie plant. It’s a plant so dangerous they kept it in a clear locked cabinet. He told a story of a man who crashed into Queensland rainforest during a flight training exercise and, in desperate need of a toilet, searched for a leaf to use as makeshift toilet paper. His eyes landed on an innocent-looking heart-shaped leaf, but he had unknowingly chosen the Gympie Gympie plant, which delivers an extreme and long-lasting sting. He tried everything to relieve the pain, even trying to burn the affected skin, but nothing worked. He was eventually hospitalised, and the pain persisted for weeks. Some who have been stung by the Gympie Gympie describe the agony returning for months or even years afterwards, triggered by something as simple as being in a hot shower.
The plant is nicknamed the ‘suicide plant’ and is covered in fine hairs that act like hypodermic needles, injecting a neurotoxin directly into the skin. Botanist Marina Hurley describes the sting as feeling like being burned by hot acid and electrocuted at the same time. This neurotoxin has been named gympietide, and the long-lasting pain is not caused by the hairs remaining stuck in the skin, it's instead thought that the plant is capable of permanently altering sodium channels in sensory neurons, essentially rewiring how pain signals are processed.
So while the Gympie Gympie is undoubtedly one of Australia's more unpleasant surprises, it isn't all bad news. Understanding how gympietide affects pain pathways allows for better treatments for those stung, and may also contribute to the development of new painkillers. This is a reminder that even the most hostile corners of nature can have something useful to offer.
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References:
Kruszelnicki KS. Stinging trees. ABC Science [Internet]. 2001 Feb 8 [cited 2026 Feb 14]. Available from: https://www.abc.net.au/science/articles/2001/02/08/243639.htm
Native stinging tree toxins match pain of spiders and scorpions. Institute for Molecular Bioscience, The University of Queensland [Internet]. 2020 Aug [cited 2026 Feb 14]. Available from: https://imb.uq.edu.au/article/2020/08/native-stinging-tree-toxins-match-pain-spiders-and-scorpions
Westmaas R. The “Suicide Plant” Has the Most Painful Stingers in the World. Discovery [Internet]. 2019 Aug 1 [cited 2026 Feb 14]. Available from: https://www.discovery.com/nature/Suicide-Plant