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Ron Gagliardo just might have the most unusual job at Amazon. He spends most of his time tending to the thousands of plants destined for the Spheres, the 90-foot bulbous glass dome in the middle of Amazon’s sprawling campus in downtown Seattle.

Last week, Gagliardo watched as workers pulled an Australian tree fern off of an Amazon Prime truck, carried it through a particularly wide door into one of the spheres, and plopped it into the soil. Australian tree ferns are hardy, primordial plants that can reach 50 feet tall and “a favorite among greenhouse staff,” says Gagliardo. This particular specimen spent three years growing to its current…