Arbor Day is observed in Australia on June 20, with its origins dating back to 1889 when it was proposed by concerned South Australians in response to the environmental degradation caused by human activity. The inaugural celebration featured a parade followed by tree planting, including notable contributions from then-governor Lord Kintore and his wife, who planted a bunya pine and a weeping Scotch elm that continue to thrive today. The event emphasizes the importance of environmental protection, and various states in Australia have their own Arbor Days, while Arbor Week is celebrated in Victoria. Additionally, Australians participate in National Tree Day and School Tree Day, highlighting the nation's commitment to ecological observance and tree planting initiatives.