Clumped Marsh Grass (IMAGE) Duke University Caption Marsh grasses planted in a clump (foreground) exhibit greater density and growth after one season than grasses planted well apart in spaced rows (background). Credit Brian Silliman, Duke Univ. Usage Restrictions None License Licensed content 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.