Horticultural Perlite

100% Natural

Perlite is a naturally occuring, volcanic rock. When furnaced at high temperatures, Perlite "pops" and expands 7 to 15 times its original volume. The resulting lightweight particles are made up of microscopic spheres with a porous, broken surface that promotes plant growth. This allows aeration and drainage of the root system and provides holding capacity for water and nutrients.


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Horticultural Uses for Perlite
  • Propagation of seedlings and cuttings
  • Soil conditioning
  • Hydroponics
  • Roof deck gardens and eco-roofs
  • Nursery stock
  • Hanging baskets
  • Turf enhancement
  • Newly planted trees and plants

Product Size Comparison

Typical particle size distribution of horticultural grades.

Water Holding Capacity

Water content of perlite grades in simulated dry-down of soil.

Perlite for Horticulture

Downloadable brochure.

Product Specifications

Our horticultural grade products typically range between 4.5 - 6.0 lb/ft3 loose weight density. See Tech Info for a Typical Elemental Analysis. Product specifications and availability are subject to change without notice. Contact us for current sizes or to inquire about specialty grades.

See Describing Perlite Particle Size for an explanation of the data shown below.

Regular Coarse "Propagation Grade"

An all-purpose grade offering balanced drainage and water-holding capacity.

US Mesh Inches Microns % Retained by Vol. *
4 3/16" 6350 5-30
8 3/32" 2380 65-70
16 3/64" 1190 90-100

* Cumulative

  • 34% water-holding capacity
OMRI Listed

OMRI lists expanded perlite as an acceptable mineral component of horticultural soils. Download the certification letter for this product.

Medium "Soil Mix Grade"

Ideal for soil blocks and starts. Also used in Media Filter Drain storm water filtration.

US Mesh Inches Microns % Retained by Vol. *
6 1/8" 3360 0-10
8 3/32" 2380 40-50
20 1/32" 841 90-100

* Cumulative

  • 46% water-holding capacity

Small "Plug Grade"

Fine grade perlite originally developed for the silviculture.

US Mesh Inches Microns % Retained by Vol. *
12 1/16" 1680 10-25
16 3/64" 1190 25-50
50 1/128" 297 90-100

* Cumulative

  • 52% water-holding capacity

Perlite Institute Member

Since 1954