SpeedTree will let you import a mesh into the modeler and model foliage around/on top of it. SpeedTree also generate LOD's, wind effects, AO, automatically on exporting to UE4, Hope that helps!
oh wow that sounds great. So instead of trying to create foliage on my model (Lets say a old ruined car) in maya then exporting it into unreal.. i should use speedtree to place that into UE4? The way i was thinking of doing it was this Model out my wall which looks more like a bush. Then add the leaves and what not to it…