Reviewed by Specialty Soils Updated August 21, 2026
Both can increase coarse pore space, but they are different materials. Neither is universally better.
Both change physical behavior
Pumice and perlite are components used to create coarse pore space in growing media. Neither is complete soil, and neither can be ranked as universally better without knowing the container, crop, irrigation, desired weight, and production duration.
| Characteristic | Pumice | Perlite |
|---|---|---|
| Material | Porous volcanic rock | Expanded volcanic glass |
| Handling weight | Heavier than perlite | Very lightweight |
| Structural presence | Comparatively durable coarse component | Widely used lightweight component in container and propagation media |
| Useful question | Which particle size and physical behavior fit the complete recipe? | |
Particle size matters
The product name alone does not describe the pore system it will create. Fine particles can occupy spaces between coarse particles. Grade, proportion, surrounding ingredients, processing, and time all influence air space and water holding.
When pumice may fit
- A durable mineral component is useful in the complete recipe.
- Additional weight is acceptable or helpful.
- The target particle distribution fits the container and crop.
When perlite may fit
- Low handling weight matters.
- The propagation or container formulation is designed around it.
- The selected grade and proportion fit the desired air-and-water balance.
What neither product does
Neither replaces the organic, mineral, chemical, and biological functions of a complete growing medium. Pumice also does not create an outlet for water in a poorly graded landscape. If a wet site has nowhere for water to go, diagnose drainage before purchasing an amendment.
For a planned container recipe, review amendments and use Find My Soil. For a wet landscape, start with Diagnose My Soil.
Use pumice as a component—not a complete medium
Connect the physical role of pumice to the complete container or growing-media system.
Sources & references
General horticultural guidance is supported by the following authoritative resources. Specialty Soils product statements and labeled company observations are first-party information.