Hedges are different from shrubs and bushes, and this becomes clear when it comes to maintaining them. Hedge trimming is a touchy process of evening up, rounding smoothly and polishing them into shapes. Essentially, as ironic as it may sound horticulturally, hedges are generally planted and maintained to look as unnatural as possible. In my opinion, this concept can be used for tastefully integrating a formal element of prestige into a natural scene. If you prefer an all-natural look, shrubs and bushes will be ideal; hedges tend to appear unruly instead of natural if they aren't trimmed regularly.