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3/16" Pumice

3/16” Pumice is a volcanic rock that gets its appearance from the simultaneous rapid cooling and depressurization process after being ejected out of a volcano.  3/16” Pumice contains small vesicles, which is what causes it to be so light in weight.  These vesicles help to retain nutrients and moisture when used as a soil amendment.  3/16” Pumice will also help with drainage as it creates great pore space in soil.  3/16” Pumice has a neutral pH and will not decompose.  It also does not attract fungi, nematodes, or insects.  By adding as little as 10% of 3/16” Pumice to your soil, you will experience these advantages.


3/16" Pumice Cutsheet


  • Soil Amendment 
  • Component of container mixes and soil-less mixes 


  • Amending soil, mix 10% of 3/16” Pumice with soil to start out with.  Percentages vary depending on the type of gardening project (Plants, flowers, cactus, tree, etc.).
  • In soil-less potting mixes, some plants respond differently to the same ratio.  Try small trial batches to determine what mix is best for your plants. 
  • For further 3/16” Pumice ratio information on gardening, call your local nursery for assistance.


Sieve Analysis % Passing

  • 3/8” (9.5 mm) 100
  • #4 (4.75 mm) 67
  • #8 (2.36 mm) 25
  • #16 (1.18mm) 17
  • #30 (600um) 16
  • #50 (300um) 14
  • #100 (150um) 13


Specification data subject to change. Additional data available upon request.

Limitation of Warranties: Seller makes no warranty of any kind, express or implied, regarding the materials; and all warranties, including any implied warranty of merchantability and any implied warranty of fitness for a particular purpose, are hereby excluded.