What is Tumbled Glass Mulch?
Glass mulch is a commonly used synthetic, or inorganic mulch. Using tumbled glass mulch made from used glass bottles, old windows, and other glass products keeps glass out of the landfills. The ground, tumbled glass, which may display minor flaws common to recycled glass, is available in various shades of amber, blue, and green. Clear glass mulch is also available. Sizes range from very fine mulch to 2 to 6 inch (5-15 cm.) rocks.
Using Recycled Glass in Gardens
Tumbled glass mulch has no jagged, sharp edges, which makes it useful for a variety of uses in the landscape including pathways, fire pits, or around potted plants. The mulch works well in beds or rock gardens filled with plants that tolerate rocky, sandy soil. Landscape cloth or black plastic placed under the glass keeps the mulch from working its way into the soil. Using landscape glass as mulch tends to be relatively expensive, but the low maintenance and longevity help balance the cost. As a general rule, 7 pounds (3 kg.) of glass mulch is enough to cover 1 square foot (929 sq. cm.) to a depth of 1 inch (2.5 cm.). An area measuring 20 square feet (2 sq. m.) requires about 280 pounds (127 kg.) of glass mulch. However, the total amount depends on the size of the glass. Larger mulch measuring 1 to 2 inches (2.5-5 cm.) or more usually requires at least twice as much to cover the ground effectively than smaller mulch. The expense is higher if the mulch is shipped. Look for glass mulch at retail building supply companies or nurseries or contact landscape contractors in your area. In some areas, the mulch is available at the Department of Environmental Quality or city recycling facilities. Some municipalities offer recycled glass mulch to the public free of charge. However, choice of specific sizes and colors is usually limited.
