Pepper plants in a greenhouse (IMAGE) Princeton University Caption Pepper plants were grown in a greenhouse at the Museo Nacional de Ciencias Naturales (CSIC) in Madrid to investigate how their below-ground behavior differed when planted alone vs. alongside a neighbor. Credit Ciro Cabal, Princeton University Usage Restrictions Editorial use 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.