Mulch can be broken down into two categories: either organic and inorganic, each suitable for a wide variety of uses. Organic mulches are typically made from decomposed plant materials, including compost, fallen leaves, grass trimmings, as well as wood chips, pruned branches, and long-lasting bark nuggets.
Meanwhile, inorganic mulches consist of items such as stones, gravel, pebbles, along with synthetic products such as plastic coverings, landscape fabrics, and repurposed rubber. A distinguishing characteristic of organic mulches, however, is their ability to decompose over time, making them a more sustainable choice for the environment, as well as offering much more in the way of natural aesthetics for your garden.