Hedges are EASY!! All you do is build the rest of your scene, or put in primitives where you want your larger objects to go (the things the hedges will go around). It's easier if the render is 512x512 or 1024x1024. Then, do an altitude render of that scene. Take your altitude render into your 2D paint program, and draw your hedges in a separate layer. Just paint them in (in white) for width and layout. Then,taking a thin black brush, scratch the living daylights out of them. Save that layer (just that layer)as your new hedges terrain. Bring it back into your scene as a terrain. Adjust the height, and use something like one of the foliage materials on it, and you have hedges.

Could be worse, could be raining.