Poplar Plantations (image) University of Washington Caption GreenWood Resources' select poplar varieties grow very rapidly, one reason they are considered a promising feedstock for biofuels. Here at a GreenWood Resources plantation in Oregon, trees on the right show the rapid growth in the first year after planting, trees on the left are eight years old and 10 inches in diameter. Credit GreenWood Resources Usage Restrictions Credit required Disclaimer: AAAS and EurekAlert! are not responsible for the accuracy of news releases posted to EurekAlert! by contributing institutions or for the use of any information through the EurekAlert system.