A pinewood of 173 ha in the municipality of Arnhem was destroyed by fire on July 7, 1976. In the spring of 1978 and 1979 about 82 ha of this terrain was planted with broadleaves and conifers. As an experiment to increase the moisture retention capacity and to hinder the settlement of weeds, a layer of 10 cm of chipped tree bark was strewed. The chipped bark came from the Netherlands, Belgium, Germany and Scandinavia. During a floristic inventory of the terrain in the summer of 1979 more than 300 wild plant species were found, many of them rare or even unknown in the Netherlands. Almost all these species were found on the part covered with tree bark. Presumably the seeds of many species were introduced with the tree bark. It seems worthwhile to follow the development of the flora of this terrain.