The sketchup users can apply a new scattering extension for Sketchup alias Skatter to produce vegetation inside sketchup. This sketchup extension is still in beta stage and will be available soon for commercial usage. Skatter is compatible with V-ray, Thea and Kerkythea. In future, it can support Octane, Indigo and Maxwell Render.
Go through the following video that demonstrates the alpha view of this sketchup plugin. This video will show the users how the plugin performs with rendering engines as well as creates component instances within sketchup.