Pick the rock size for the job, then size the order with one rule: one cubic foot of rock covers about 4 sq. ft. at a 3 in. depth, or about 6 sq. ft. at 2 in. Fine gravel suits paths and planters, mid-size pebbles suit beds and borders, and large angular rock suits drainage and slopes. This guide matches rock size to use, shows the coverage math, and points to the stocked options for drought-friendly Los Angeles yards, where fall is the best time to convert a lawn.
Which rock size for which job?
Size drives both look and function. Small, uniform gravel packs tightly and walks well. Larger rock looks bolder and sheds water, but it is harder to walk on. Rounded river pebble reads as softer and more natural, while crushed, angular rock locks together and stays put on slopes.
| Rock type |
Size |
Best use |
Walkable |
| Pea gravel |
1/4 - 1-1/2 in. |
Paths, play areas |
Yes |
| River pebble |
1/4 - 2 in. |
Beds, tree rings |
Fair |
| Small crushed gravel |
1/4 - 1/2 in. |
Planters, borders |
Yes |
| Large angular rock |
1/2 - 3 in. |
Drainage, slopes |
No |
Stocked options to start with
The landscape rocks collection covers bagged and bulk rock. For paths, the Pea Gravel 0.5 cu. ft. bag is a tan, easy-walking option. For beds around trees and shrubs, the River Pebble 0.5 cu. ft. bag adds multi-color texture. For a clean modern look, the White Gravel 0.4 cu. ft. bag is a uniform small stone.
How to calculate coverage
Multiply the area by the depth, then divide by the bag size. A 100 sq. ft. bed at 2 in. deep needs about 16.7 cu. ft. of rock, which is roughly 34 bags of 0.5 cu. ft. Add 5 to 10 percent for settling and uneven ground. The product pages list coverage per bag, for example about 2 sq. ft. at 3 in. for the 0.5 cu. ft. pea gravel and river pebble bags, and about 1.5 sq. ft. at 3 in. for the 0.4 cu. ft. white gravel bag.
Choosing the right depth
Use 2 in. for decorative beds, 3 in. for paths and play areas, and 3 in. or more over landscape fabric where weed control matters. Thinner layers let soil show through and fail quickly.
When to switch to bulk
Once a project passes roughly 20 to 30 bags, bulk rock is usually easier to handle. Bulk off-white rock in 900 lb. lots is stocked for larger yards and drainage runs. Call the store to confirm bulk availability and delivery for your address.
Drought-friendly yards in Los Angeles
Rock mulch is a core part of a water-wise yard. It keeps soil from drying out, slows erosion on slopes, and does not fade, rot or feed termites the way wood mulch can. Start with the lawn removal, lay landscape fabric, then place rock over it, edging beds so stone stays out of lawn and walkways. In fire-prone hillside areas, keeping the zone next to the house free of combustible mulch and using rock instead is a common defensive-space tactic; confirm requirements with your local fire authority.
Drainage and erosion
Larger angular rock slows runoff and helps keep slopes in place before the winter rains. For a full slope plan, see our hillside erosion control guide, and for base layers and sub-base choices, read sand, gravel and base rock: which aggregate to use.
Paths, patios and walls
Rock paths need a compacted base and edging to stay put. If you are adding pavers or stepping stones, our concrete pavers guide covers the hardscape side, and the retaining walls guide covers terraced beds. Browse the full landscaping and gardening collection for edging, fabric and tools.
Landscape rock order checklist
- Area in sq. ft. and chosen depth, converted to cubic feet
- Rock size matched to use: pea gravel for paths, pebble for beds, angular rock for drainage
- Landscape fabric and edging to hold the rock in place
- A wheelbarrow and rake for moving and leveling
- An extra 5 to 10 percent for settling
Conclusions
Match the rock size to the job, calculate cubic feet from area and depth, and order a small buffer. Use small gravel where people walk, pebble where it is decorative, and angular rock where water moves.
