A Rock Mulch Garden on Rapa Nui (IMAGE) University of Bristol Caption A rock mulch garden on Rapa Nui with taro (Colocasia esculenta) is growing. Taro has long been a staple food of the natives of Polynesian Islands. Credit Terry Hunt 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.