Unscreened Red Lava Rock – 3/8" Minus

Create your own custom soil blend with natural Cascade Mountain volcanic red lava rock. This unscreened 3/8" minus material is ideal for bonsai growers, succulent and cactus enthusiasts, and specialty plant nurseries who prefer to screen their own aggregate to achieve their desired particle sizes.

Unlike our hand-screened lava products, this material comes directly from the quarry and contains a full range of sizes, from approximately 3/8 inch down to powder fines. Its unscreened composition makes it a more economical option for buyers who want to do their own sorting.

The lava is primarily red and dark gray.

Product Details

• Material: Natural Cascade Mountain volcanic lava rock

• Color: Primarily red and dark gray

• Size: 3/8" minus, unscreened

• Particle Range: Approximately 3/8 inch to powder

• Processing: Unscreened, as received from the quarry

• Use: Bonsai soil, succulent and cactus mixes, and specialty nursery potting mixes

Approximate Particle Size Composition

The material can be screened into approximately the following proportions:

These percentages are approximate. This listing is for unscreened material, so particle sizes and proportions may vary.

Available Package Sizes

Choose from the following volumes:

• 15 oz

• 10 cups

• 5 quarts

• 3 gallons

• 6 gallons

• 12 gallons

• 18 gallons

• 24 gallons

Approximate Container Fill Conversions

These are approximate container-fill conversions.

Shipping Information

• 15 oz, 10 cups, and 5 quarts: USPS

• 3 gallons: USPS or UPS

• 6, 12, 18, and 24 gallons: UPS

Shipping is included in the price.

Samples Available

Not sure whether the particle sizes will suit your project?

Samples are available for the cost of shipping. They are large enough to examine the material's appearance and particle range, but not enough to complete a project.

If you order 6 gallons or more, the sample freight cost will be reimbursed. Please let us know when you place your order.

Packaging and Handling

Our lava rock is hand-packed in bags with a reusable tie for convenient storage after opening.

If the material dries before use, lightly moisten it to help prevent dust from forming.

Dust Safety: Dust from rock and potting soil products should not be inhaled and may irritate people with sensitive lungs. Handle carefully and avoid creating airborne dust.

A More Economical Option for Custom Screening

This unscreened lava rock is a practical choice for growers who want to control their own particle-size selection. Screen it to suit your preferred bonsai substrate, cactus mix, succulent soil, or specialty nursery blend.