2 Gallons Black 1/4 inch Bonsai Lava Rock (8 Dry Quarts)


Horticultural Lava Rock

Size: ¼ Inch

Condition: Sifted, Washed, Dried and Bagged.

1/4 inch Lava Rock are used for the vast majority of fast draining soils and is our number one seller. This includes cacti and succulents. We offer Black and Maroon (red). Available in Quart, Gallon, 2 Gallon and 3.5 Gallon bags.

Lava Rock is used as a soil additive or top dressing in the art of bonsai. Mix with other ingredients such as pine bark fines, granite grit, calcined clay, and or dirt to create a succulent, cactus or bonsai soil specific to your needs.

Features include…

  • Manufactured in the US.
  • Consistent sizes, ready to use, no sifting required.
  • Pure lava rock, no fillers, no chemicals or artificial coloring.
  • Multiple bag sizes and colors to best fit your potting needs.
  • Packaging. Our aggregates are professionally packaged in custom 6 mil bags.

Did you know?
All of our soil products are state inspected and tested on a regular basis in order to comply with multi-state regulations.
This ensures you receive material free of dangerous pathogens that can damage or kill plants. This is also required to maintain six nursery stamps that allow us to ship to all 50 states.

Click the Additional Information tab for more details.


GTIN 00857206008244 SKU: 857206008244 Category:

Additional information

Weight 12 lbs
Dimensions 12 × 4 × 13 in

Jet black when wet. Black with a hint of ash when dry. Natural color. No dyes.

Raw Material

Volcanic rock.

Country of Origin(COO)

United States

Average Particle Size

1/4 Inch

Minimum Particle Size

1/8th Inch

Maximum Particle Size

3/8ths Inch


2, Dry

Cubic Inches


Cubic Feet



Two 1 Gallon Bags


9.94 … Contrary to popular belief, lava rock is not pH neutral.

Plant Type

Soil Conditioner


Dye-free. Chemical free

Other Applications

Aquarium gravel, ash trays, top dressing for plants, fire media, garden soil amendment and fire pits.

Bulk Density

.470 ounces per cubic inch

Conversations ...

  1. Question

    Laurie Pappas

    Based on some articles I have read, I would like to put lava rock in the bottom of a pot that is deep, in which I plan to plant succulents. I’ll be using your succulent soil. What product would be best for this application? I was thinking this would be more cost effective than filling the whole thing with your soil, but in looking at the prices, perhaps not? They had mentioned just getting lava rock (larger than yours I think) from a garden center… maybe that would be a better choice? Thanks!

    (0) (0)

    Something wrong with this post? Thanks for letting us know. If you can point us in the right direction...

    • Bonsai Jack

      Hello Laurie,
      You asked about drainage layer material. Here is a quote from our FAQ page
      MONEY SAVING TIP: If you have an especially deep container and
      do not expect your succulent / cactus roots to penetrate to the bottom you can
      use a drainage layer as fill. Bagged lava rock can be purchased for about 5
      dollars at your local big box store. This can be used to fill the lower section
      of the container. Example; If you expect your roots to penetrate 2 inches of a
      10 inch deep container then you only need to fill the top half with about 5
      inches of soil. The lower section can be drainage layer material.

      It is a good idea to purchase regular lava rock form a big box store to save on soil Our soil is relatively expensive because of the design. If it’s not going to be used on a plant a larger lava rock filler will work just fine.

      Have a great week


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      Something wrong with this post? Thanks for letting us know. If you can point us in the right direction...

    • Laurie Pappas

      Jack, thanks! I’ll bet it was on your site where I read it! I have looked so many places, I can’t remember what I read where.

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      Something wrong with this post? Thanks for letting us know. If you can point us in the right direction...




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