Sampling Vetch Regrowth (IMAGE) American Society of Agronomy Caption Despite their benefits, cover crops can come back and compete with cash crops. Research technician Mark Dempsey samples the regrowth of hairy vetch after it was rolled by the crimper. Credit Clair Keene Usage Restrictions Please 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.