Landscape Gravel Types Explained: Which Gravel Is Right for Your Project?

Walk into any landscape supply yard and you'll find a dozen types of gravel. Pea gravel, 3/4 minus, crushed rock, river rock, drain rock, decomposed granite — what's the difference and which do you actually need?

This guide breaks down every common gravel type, what each is best for, and how to choose the right one for your project.

The Key Distinction: Angular vs. Rounded

Before getting into specific types, understand the most important distinction in gravel:

• Angular (crushed) gravel: Has sharp, irregular edges. When compacted, the edges lock together. More stable. Better for driveways, pathways, and anywhere you need the material to stay firm.
• Rounded (natural) gravel: Smooth, water-worn stones. Doesn't compact. Moves underfoot. Better for drainage, decorative use, and soft surfaces like playgrounds.

Gravel vs. Crushed Rock: What's the Difference?

These terms are often used interchangeably, but technically:

• Gravel = naturally occurring, water-worn, rounded stones. Sourced from riverbeds or glacial deposits.
• Crushed rock/crushed stone = quarried rock that's mechanically crushed. Angular edges. More uniform sizing.

For most Pacific Northwest applications, crushed rock (like our 3/4" minus or 1-1/2" crushed) is preferred for functional use because it compacts and stays in place. Rounded gravel (pea gravel, river rock) is preferred for decorative use and drainage.

Common Gravel Types and Their Best Uses

3/4" Minus Crushed Rock (Road Base)

What it is: Crushed angular rock, 3/4" and smaller, including fine dust ("minus"). The fines bind the material together when compacted.

Best for: Driveways, parking areas, base layer under pavers, road base, any surface that needs to compact firm and shed water.

Not for: Drainage applications (fines clog drain systems), decorative use.

Depth: 4-6 inches for driveways (compacted).

3/4" Clean Crushed Rock

What it is: Angular crushed rock, 3/4" size, with NO fines (washed). Maintains void space between stones.

Best for: French drains, drainage backfill, under-slab drainage, around foundations.

Also works for: Driveway topper layer (gives firm surface with good drainage), pathway edging.

1-1/2" Crushed Rock

What it is: Larger angular crushed rock. More void space than 3/4".

Best for: Heavy drainage applications, French drain systems with high water volume, base layer under large-format pavers, utility areas.

Visual: Too large for most decorative use but common in utility/drainage contexts.

Pea Gravel (3/8")

What it is: Small, smooth, rounded natural gravel — roughly pea-sized.

Best for: Pathways, playground surfaces, between stepping stones, garden beds, dog runs. See our full pea gravel guide for project ideas.

Not for: Driveways (rolls and scatters), steep slopes.

River Rock (1"–6")

What it is: Larger smooth rounded stones, naturally water-worn.

Best for: Decorative landscaping, dry creek beds, water features, garden borders. See our river rock guide for 15 project ideas.

Drain Rock

What it is: Clean, washed crushed rock specifically sized for drainage (usually 3/4" or 1" angular, no fines).

Best for: French drains, retaining wall backfill, foundation drainage, any application where you need water to flow through freely.

Key: Never use "minus" material in a drainage application.

Decomposed Granite (DG)

What it is: Granite that has naturally weathered into small granules and fines. Compacts to a firm, stable surface.

Best for: Pathways and patios where you want a natural, compacted surface. Popular in drought-landscaping and modern minimalist yards.

Downsides: Can become muddy when wet; requires stabilizer in high-traffic areas; not as common in western Washington as in drier climates.

Decorative Rock (Mexican Beach Pebble, Lava Rock, etc.)

What it is: Premium decorative stone — polished, colored, or specialty types.

Best for: Feature areas, container gardens, accent spots where visual impact matters. See our decorative rock page for what we carry.

Quick-Reference: Which Gravel for Which Job?

Frequently Asked Questions

What is the difference between gravel and crushed rock?

Gravel is naturally rounded, water-worn stone. Crushed rock is mechanically broken from quarried stone, giving it angular edges. Crushed rock compacts better for driveways and paths; rounded gravel is better for drainage and decorative use.

Can I use pea gravel for a driveway?

Not recommended. Pea gravel's smooth, round shape means it scatters under vehicle traffic and creates an unstable surface. Use 3/4" minus crushed rock for driveways instead.

What gravel is best for drainage?

Clean, washed, angular crushed rock with no fines — 3/4" or 1-1/2" clean crushed. The "clean" designation means no dust or sand that would clog the drainage system over time.

Not sure which gravel you need? Harbor Soils carries all major gravel types and can help you choose. Delivery throughout Gig Harbor, Port Orchard, and Kitsap County. See our gravel options →