Black Lava Rock – 3/4″ minus

3/4-inch black lava rock is a lightweight volcanic landscaping rock with a rugged texture and deep charcoal color. Its smaller size creates a more detailed, uniform ground cover than our larger 1.5-inch Black Lava Rock.

This is an unwashed 3/4-inch-minus rock. The largest pieces are approximately 3/4 inch, while the material also contains smaller rock and crushing fines. This range of sizes helps the material settle into a denser, more blended layer.

Small Black Volcanic Landscape Rock

Black lava rock adds strong contrast around shrubs, ornamental grasses and other landscape plants. Its dark natural color works especially well in xeriscapes, modern landscapes and areas with light-colored concrete or stone.

Unlike wood mulch, lava rock does not decompose and does not require regular replacement. Occasional raking or additional material may still be needed as the rock settles or moves over time.

Benefits of 3/4-Inch Black Lava Rock

• Deep charcoal-black natural color
• Rugged and porous volcanic texture
• Smaller size creates more uniform coverage
• Lightweight compared with many landscape rocks
• Does not decompose like organic mulch
• Works well in low-water and xeriscape designs

Recommended Uses

• Decorative planting beds
• Planters and landscape accents
• Xeriscapes and waterwise landscapes
• Ground cover around shrubs and established trees
• Smaller spaces where large rock may appear too coarse
• Residential and commercial landscape areas

Because lava rock has a rough, irregular surface, it is better suited for decorative ground cover than frequently used walkways, patios or barefoot areas.

Size, Fines and Natural Variation

This is a 3/4-inch-minus product rather than uniformly sized 3/4-inch rock. Customers should expect a changing mixture of 3/4-inch pieces, smaller particles and crushing fines.

The rock is not washed and may contain up to approximately 10% crushing fines, rock dust or soil. It may appear dusty when dry and darker after rain or irrigation.

As a natural material, the exact size distribution, shape and color will vary between loads. Some pieces may appear dark gray instead of solid black.

Weight and Coverage

One cubic yard weighs approximately 1,000 pounds, or 0.5 tons. Actual weight can vary depending on moisture and the amount of fine material in the load.

Install the rock approximately 2 to 3 inches deep. One cubic yard covers about 162 square feet at 2 inches deep or 108 square feet at 3 inches deep.

Installation Preparation

For best results, prepare and grade the area before installation. Commercial-grade landscape fabric can be installed beneath the rock where appropriate to separate it from the underlying soil and help manage weed growth.

Keep the finished rock below adjacent sidewalks, curbing and other concrete surfaces to reduce spillover. This product should not be expected to compact or perform like pathway chat or road base.

Pickup, Delivery and Installation

Rock N Yard Landscape Center sells 3/4-inch Black Lava Rock by the cubic yard or ton. It is available for pickup at our Copperton location or delivery throughout the Salt Lake Valley.

Visit our landscaping rock products page to compare additional colors and sizes, or contact us if you need help estimating your quantity.

Rock N Yard Landscape Services can also deliver and install Black Lava Rock in a prepared project area. Learn more about our landscape material installation service or request an estimate based on the project size, access and installation requirements.