Decomposed granite (DG, sold as ¼" minus) and larger decorative rock are both crushed granite. The difference is size, and size decides where each works.
| Decomposed granite (¼" minus) | Larger decorative rock (½"–1"+) | |
|---|---|---|
| Best for | Paths, sitting areas, under patio furniture | Front yards, beds, large open areas |
| Feel underfoot | Packs into a firm surface | Loose; less comfortable to walk on |
| Weeds | Fine surface can hold blown-in dust and seeds | Weed barrier underneath helps |
| Installed cost | Rock in general: about $0.85–$1.60 per sq ft (Phoenix) | Same range |
How much to order
Most yards use 2 inches of rock; paths and heavy cover use 3 inches. Our rock guide has a tons calculator (about 1.4 tons per cubic yard, plus 10%).
Mix them
Many Arizona yards use DG for a patio or path and a larger rock for the beds around it. Look at samples in daylight, since color names vary by supplier. See rock vs. turf if you are still deciding on a surface.
Find a licensed pro
Every contractor on Dry Heat Yards has an active Arizona ROC license, checked monthly.
Find rock yards near youFAQ
What is decomposed granite used for?
DG (¼" minus) is used for paths, sitting areas and under patio furniture because it packs into a firm surface.
How deep should landscape rock be in Arizona?
Most yards use 2 inches; paths and heavy cover use 3 inches.
How much does decorative rock cost installed?
About $0.85 to $1.60 per sq ft installed in the Phoenix area. Buying and spreading it yourself costs less.
Prices are ranges from our sourced cost guides, checked November 2026, before tax. Always get written quotes from licensed contractors.