Glass rocks for landscaping: colors, sizes and where to use them
Glass rocks are tumbled recycled glass with the sharp edges taken off, sold by weight in more than forty colors and finishes. The everyday sizes run roughly 1/4 inch to 1/2 inch, small enough to spread like gravel and large enough to catch light. They work as a top dressing in planting beds and planters, in the basin of a water feature, as an accent band beside a path, and anywhere a solid, unfading color is wanted. Glass never bleaches out the way dyed mulch does, and it does not break down, so a glass rock bed is a one time fill rather than an annual top up.
Is landscape glass rock safe for fire pits?
No. Landscape glass is not heat treated, and that is exactly why it costs less than tempered fire glass. Put it over a burner and it can crack, pop and throw fragments. Keep landscape glass rock to decorative use only: beds, borders, planters, water features and accent work. For a fire pit, fire table or fireplace, buy a tempered fire glass instead, such as Crystal Reflective Fire Glass or Cobalt Blue Fire Glass. Fire glass is tempered for high heat, burns clean without smoke or soot, and is the only glass we will sell for a burner. If a product page does not say fire glass, do not put it in a fire.
Landscape glass rock vs fire glass: how to tell them apart
The names on this store are literal. Anything titled landscape glass is decorative and untempered. Anything titled fire glass is tempered and rated for a burner, and the reflective grades add a mirrored backing that throws far more light from the same flame. Fire glass costs more per pound because of the tempering, so it is not the economical choice for a large bed. Both are sold by weight and both come in the same color families, which is why they are shown together here. Read the product title first, then the description, before you order for a fire feature.
Living with a glass rock install
Tumbled edges make glass rocks comfortable to handle, but it is still glass. Keep it out of lawn areas where a mower could throw a piece, and out of the barefoot paths and play areas where rounded stone is the better answer. A quick rinse with a hose brings the color back after dust settles. In a bed, lay it over commercial grade landscape fabric so it stays on the surface instead of sinking into soil. Depth of about one inch is plenty; glass is there for color, not for coverage, and a thin layer over a dark fabric reads brightest.
