The forest area in Flanders is strongly fragmented and most of the forests are also small. As a consequence edge effects are very large, e.g. from the surrounding agricultural landscape. This research aims at enlarging the insight into the penetration of non-forest plants from the surrounding farmland into the forests and vice versa, the penetration of forests plants into agricultural land. Different aspects are studied: biotic composition within transect perpendicular on the forest edge; seed bank composition along the gradient from farmland into forest (taken from soil samples); abiotic variables (microclimate and soil factors).