The 6th Plant Biomechanics conference was hosted in Cayenne, French Guiana in November 2009. It follows a series of conferences organized every third year since 1994 when the first of these conferences were organized in Montpellier, France. Since then, conferences in Reading, UK, Frieburg-Badenweiler, Germany, East Lansing, Michigan USA and Stockholm, Sweden. As for the former conferences there was papers dealing with all kind of plants and very different mechanical solutions at whole plant, organ or cell level. There is also a strong emphasis on useful material coming from plants and on bio-inspired solutions for engineering. Some participants, old friends of the beginning, were actors of the five other PBM, but many young scientists and PhD come for the first time. At a total there were 88 participants from 16 countries and the proceedings gather 70 oral presentations and 14 posters for a total 563 pages.