In the July 27 “Gardening Corner,” I wrote about several organic mulches and the advantages and disadvantages of each. Inorganic mulches also are available, and while useful in specific areas of a garden, may not present the appearance a homeowner would desire in flowerbeds and borders.Inorganic mulches are composed of non-living materials and contain little or no carbon. They include crushed stone, plastics, rubber, and polypropylene or polyester fabrics called geotextiles. Inorganic materials will initially cost more than organic mulches, but the cost is offset by the fact that these products will last for several years. Inorganic mulches don’t contain weed seeds and won’t deplete nitrogen in the soil. Some inorganic products are good weed suppressors.
Stone, in particular, can be visually attractive in the landscape, and there are many choices, including gravel, smooth river stones, marble chips, granite, and volcanic rock. Gravel walkways and drives present a casual, inviting appea...