Spikes (IMAGE) American Society of Agronomy Caption MN-Clearwater wheatgrass spikes prior to their pollen shed. Credit Prabin Bajgain Usage Restrictions For use with this 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.