Nodules (IMAGE) American Society of Agronomy Caption Sunn hemp makes extensive roots, which help in soil health. Though the tops of the plants are terminated by cutting, the root system is left intact. Credit Ariel Friedenreich Usage Restrictions For use with story only. 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.