In order to investigate the possibility of modelling plant motion at the landscape scale, an equation for canopy plant motion, forced by the instantaneous wind flow, is introduced in a largeeddy simulation (LES) airflow model, previously validated over homogeneous and heterogeneous canopies. The canopy is simply represented as a poroelastic continuous medium, which is similar in its discrete form to an infinite row of identical stems. In a first step only one linear mode of plant vibration is considered. The two-way coupling between plant motion and the wind flow occurs through the drag force term. This coupled model is validated against data recorded over an alfafa canopy, whose motions have been analysed elsewhere in great details from video recordings. It is shown that the model is able to reproduce the well-known phenomenon of honami. The model is then extended to a forest canopy using the first flexible vibration mode, and compared to the previous model and a finite-element model of a tree. The simplified models are shown to be as efficient as the finite-element model. Finally, the possibility of using such a porous elastic approach for studying forest canopy motion at landscape scale is discussed.