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Fast‑Growing Trees for Ethanol: Poplar, Willow, Sycamore, Sweetgum, Cottonwood

Short‑rotation woody crops for ethanol: in cool/wet regions, poplar and willow; in warmer areas, sycamore, sweetgum, and cottonwood. They reach 40 ft in <8 years and can be harvested 10‑20 years before replanting.

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