1 Gallon 1/4 inch Bonsai Block (4 Dry Quarts)

U$D 19.95

Bonsai Block

Size: ¼ Inch

Condition: Sifted, Washed, Dried and Bagged.


Bonsai Block is a lightweight high fired soil amendment with a variety of earth-tones including peach, ash, black, tan and dark grey. It can be used as a substitute for lava, pumice and hard Akadama.

Perfect for amending soil for all plant types including cactus, succulent, bonsai , orchids and other plants that require a fast draining soil.

It arrives prescreened, sifted and neatly packaged in several bag sizes.

Consistent ¼ inch particle size. This increases drainage and air exchange within the potted plant.

Cosmetics. Bonsai Block is a great looking aggregate. It has a natural pebble look with multiple earth tones. Works great as a top dressing.

Fired at extremely high temperatures. This helps prevent breakdown and ensures a long service life.

Bonsai Block is a superior product and is priced lower than lava and about the same as Turface. It has many of the same properties of Maroon Lava.

Please visit our blog for more technical details on Bonsai Block.


Click the Additional Information tab for more details.


GTIN 00857206008374 SKU: 857206008374 Category:

Additional information

Weight 6 lbs
Dimensions 10 × 8 × 5 in

uniform mix of earth tones

Raw Material

Calcined Clay

Country of Origin(COO)

United States

Average Particle Size

1/4 Inch

Minimum Particle Size

1/8th Inch

Maximum Particle Size

3/8ths Inch


1, Dry

Cubic Inches


Cubic Feet



One Gallon Bag



Plant Type

Succulent, cactus, bonsai, orchid and other plants that prefer a fast draining soil amendment.


No dyes or chemicals.

Other Applications

Top dressing. An excellent replacement for Akadama.

Bulk Density

.403 ounces per cubic inch

Conversations ...

  1. Question


    What is the difference between Bonsai Block and Monto Clay? They are both listed as calcined clay.

    (0) (0)

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

    • Bonsai Jack

      Good question Mark. They are both fired clay products. BB is a calcined ball clay similar to a hard fired Akadama, if it existed. BB is often confused with shale. It’s a pure clay product. MC is made from a type of clay that is acidic. BB will be slightly alkaline and MC is very acidic. The CEC properties of MC are thought to be high. This cannot be confirmed scientifically because the particle size cannot be tested. MC does absorb a good amount of moisture.

      I hope this helps.


      (0) (0)

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




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