A Rock Group

All rocks are made in a series of steps - cleaning in a special solution, smoothing rough edges, attaching a base in most cases, then designing a theme. For outdoor mosaics, I mostly use glass to material as it stands up to moisture, temperature changes, and UV - along with 5 other threats that we protect against. I use top grade outdoor mortar and professional grade self sealing epoxy grout. All rocks come with a 3 year warranty under normal wear and care - even though they should last 25 years. Just leave it in the garden away from the lawnmower.... and give it a shot of water/vinegar once a year!