Black Lava Rock 1/4–1/32 Inch, Screened Volcanic Rock for Bonsai Soil, Succulent and Cactus Mixes, Hydroponics, Terrariums, Natural Soil Amendment

Black Lava Rock – 1/4" to 1/32" Screened Volcanic Rock

Add natural texture, porosity, and drainage support to your specialty growing mixes with Black Natural Cascade Mountain Lava Rock. This hard, lightweight volcanic material is suitable for bonsai soil, succulent and cactus mixes, hydroponic systems using mineral media, terrariums, and specialty nursery blends.

Its pleasing black color looks attractive both dry and wet, making it useful for soil preparation as well as decorative top dressing.

Product Features

• Material: Natural Cascade Mountain volcanic lava rock

• Color: Black

• Approximate particle range: 1/4" to 1/32"

• Screening: Rescreened to remove material over 1/4"

• Texture: Hard, porous, and relatively lightweight

• pH: Neutral, according to the seller

• Durability: Does not rot

• Source: Natural volcanic material from the Cascade Mountain region

Understanding the Particle Size

Lava rock is naturally irregular and non-uniform, so particle sizes are approximate rather than perfectly consistent.

The material comes from the mine at 3/8-inch minus and is rescreened to remove particles larger than 1/4 inch.

The seller's screening process classifies material using screen sizes:

• Material passing through the 1/4-inch screen but not the 1/8-inch screen is classified as 1/4-inch lava.

• Material that does not pass through the 1/4-inch screen is classified separately as 3/8–1/4-inch lava.

Most particles in this product are around 1/4 inch, with some smaller pieces down to approximately 1/32 inch.

Because this is natural volcanic material, particle sizes and appearance can vary slightly between orders.

Recommended Uses

• Bonsai soil mixes

• Succulent and cactus potting mixes

• Specialty nursery soil blends

• Hydroponic systems using mineral growing media

• Terrarium decoration

• Bonsai and container top dressing

Available Package Sizes

Choose from the following options:

• Sample size

• 15 ounces

• 10 cups

• 5 quarts

• 3 gallons

• 6 gallons

• 12 gallons

• 18 gallons

• 24 gallons

Trade Gallon Fill Equivalents

For growers using trade gallon containers, these approximate volume equivalents may help with planning:

These are package fill equivalents, not a change in the listed package size.

Shipping Information

• Samples, 15-ounce, 10-cup, 5-quart, and 3-gallon packages ship USPS Ground Advantage.

• 6-, 12-, 18-, and 24-gallon orders ship by USPS Priority Mail or UPS.

• Free shipping is available to most locations.

• Alaska, Hawaii, APO addresses, U.S. territories, and areas considered remote may require an additional freight surcharge.

Sample Orders

Not sure whether this particle size is right for your project? Samples are available for the cost of shipping.

Samples are intended to let you inspect the material's appearance and approximate particle size; they are not large enough to complete a project.

If you subsequently order 6 gallons or more, the sample shipping cost will be reimbursed. Simply leave a message in the Special Instructions to Seller box at checkout with your sample order information.

Packaging and Handling

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

Natural lava is an organic material that gradually breaks down, and some fines may develop during shipping. Slight variations in color and particle size are normal because the material comes from different areas of the mine.

If the lava dries before use, lightly moisten it to help prevent dust from forming. Do not inhale dust from rock or potting soil products. Dust may irritate the lungs, especially for people with sensitive respiratory systems.

Choose natural black lava rock for your next bonsai, succulent, cactus, or specialty soil-mixing project!