Fibres and flocks are used in architectural models, railway models and dioramas as representations of vegetation. In addition, it also can be used as a decorative material in, for example, advertising displays. To cover an area with these materials it should first be spread evenly with glue (thinned wood glue with a brush or spray bottle; TESA all-purpose glue/Technicoll or spray adhesive). Then you just sprinkle the flock directly on the glue. If the thinned wood glue has a good amount of poster ink or toning pigment added to it, the effect of green vegetation will be much enhanced.