I have just released a new object collection over at Silva3D. It contains detailed boxwood hedge elements and topiary, ready to use for Cinema4D, Vray for Cinema4D, Terragen, Vue and of course also Wavefront OBJ for other applications. (29.95,- Euro)
Also many other objects have been released over the course of the last few months.
More details about the Boxwood Bundle: http://www.silva3d.com/product.php?id_product=85

And this is a render where some of those hedge elements have been used:
