Girl Scout Plant (IMAGE) NASA/Johnson Space Center Caption A close up of the plant incubator in the NanoRacks-Girl Scouts of Hawai'i-Microgreen Plant Growth investigation. The light green material surrounding the planting medium is florist sponge. The planting medium is all natural bark and other plant fibers. Credit Girl Scouts of Hawaii Usage Restrictions for use with this news 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.