Common Garden Petunia (IMAGE) University of Washington Caption University of Washington researchers have discovered a link between floral scent release and circadian rhythms in the common garden petunia. Credit Courtesy of Kiley Riffell Usage Restrictions Credit source. 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.