On Jan. 23, 2026, Mahbubul Islam Polash, a 34-year-old man from Bangladesh’s northern district of Sirajganj, traveled to Teknaf area in the southeastern coastal district of Cox’s Bazar, around 600 kilometers (373 miles) south of his hometown. Here, he planted a sapling of Anisoptera scaphula, a dipterocarp tree commonly known as boilam in Bangladesh. That day marked the 64th planting of the endangered tree species, completing the plantation campaign in all the districts of the country. The campaign was launched on June 5, 2024, coinciding with World Environment Day, in the northwestern Rajshahi district. When Polash learned that the towering tree species was on the verge of extinction and birds like kites and vultures were losing nesting habitats, he pinned his focus on planting boilams. “Even if it was just one species, I wanted to spread it countrywide,” Polash tells Mongabay. In 2019, he says, he planned to collect its seeds or saplings from the Chittagong Hill Tracts (CHT) and distribute them across the country. But his initial attempts to germinate boilam seeds failed. Undeterred he continued to try and, in 2023, he succeeded in the germination of 74 seeds from the 2,000 sourced from mother trees in the hilly Bandarban and Khagrachhari districts. The saplings were nurtured on a piece of land adjacent to Polash’s home in Sirajganj for a year until they reached a height of about 30-45 centimeters (12-18 inches). Finally, the boilam saplings were planted in 64 districts of Bangladesh. Polash spent 597 days and self-financed…This article was originally published on Mongabay

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