A bark mulch (Smith Bros. Original, Smith Bros. Triple, Grandscape Double, Grandscape Triple) is made entirely from the outside bark of the hardwood tree. Bark mulch is fine in texture, lays uniformly, and will add nutrients to your soil as it breaks down. It is smaller in size compared to a wood mulch.
A wood mulch (Timber Ridge) is made from the dense inner parts of the hardwood tree after the bark has been removed. A wood mulch is slightly more coarse in texture and takes longer to break down.