3.5 Gallons 1/4 inch Horticulture Pumice (14 Dry Quarts)

U$D 34.65

Horticulture Pumice

Size: ¼ Inch Horticulture Grade Pumice

Condition: Sifted, Washed, Dried and Bagged.

 1/4 inch Bonsai Pumice is an aggregate / substrate used for bonsai, succulent, cactus and orchids. Amend with other soil ingredients such as pine bark fines, granite grit, calcined clay, and or dirt to create a bonsai soil specific to your potted plant needs.

Features include…

  • Consistent size, ready to use, no sifting required.
  • Pre-rinsed
  • Packaging. Our aggregates are professionally packaged in custom 6 mil bags.
  • Processing. Each particle travels across 21 feet of screen for maximum accuracy.
  • Minimal dust or sand sized material.
  • Easy returns. If this is not the cleanest aggregate you have ever purchased simply return it for a full refund. No questions asked. We will even cover the return shipping.

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 00857206008329 SKU: 857206008329 Category:

Additional information

Weight 19 lbs
Dimensions 10 × 20 × 5 in

Bright White When Dry. Off White When Wet

Raw Material

Graded horticulture pumice

Average Particle Size

1/4 Inch

Minimum Particle Size

1/8th Inch

Maximum Particle Size

3/8ths Inch


3.5, Dry

Cubic Inches


Cubic Feet



One 3.5 Gallon Bag



Plant Type

Cactus / cacti, succulent, bonsai, cannabis, orchid and other soil blends that require a fast draining amendment.


No dyes or chemicals.

Other Applications

Top dressing.

Bulk Density

.370 ounces per cubic inch

Conversations ...

  1. Question

    Kelly A (verified owner)

    Is it typical for pumice to discolor over time due to exposure to water? While I typically use it as a soil component, I use it as a top dressing for a few of my succulents (and also as part of a design in an outdoor succulent garden) and I’ve noticed over time that the edges of the pumice have changed to a dark yellow, rusty kind of color. It’s only happening in the areas that are exposed to water (doesn’t seem to matter if it’s rain water, distilled, tap, etc.). Is this normal? Note that the color change retains even if the pumice has completely dried (after being rained on or watered).

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    • Bonsai Jack

      Thanks for the message. Pumice rarely stays bright white. Iron in the water and or in the newly mined pumice will cause it to change to a rust color. You dont see this with lava, which is loaded with iron, because its not pure white. This is why pumice is not really used as a top dressing. iron is everywhere including natural stone and water sources.

      I hope this helps. Please call or email if you have questions or concerns.


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