Horticultural Grade Perlite

An Image of Plant Pots Containing Leaves Growing and Soil with Perlite Mixed In.

Horticultural grade perlite is derived from a naturally occurring, volcanic rock. When furnaced at high temperatures, perlite “pops” and expands up to 10 times its original volume. The resulting, lightweight particles are made up of microscopic spheres with a porous, irregular surface that stores moisture and promotes plant growth.

Our perlite products have proven themselves as a consistent growing media for horticulture because they improve the characteristics of every organic material they are mixed with including peat moss, compost, bark, coir, or in native soil. Horticultural grade perlite is stable and will not degrade or compact over time. It maintains consistent aeration and drainage for plant roots and will not decompose or deplete nitrogen levels in the soil.

Adding perlite to soil and growing media lightens the soil and introduces pore spaces that allow air and water to penetrate the root system. Excess moisture is permitted to drain out and maintain balanced air and moisture conditions which contribute to healthy biological and microbial activity, and minimize the chances for rot.

The Right Perlite for You

As experts in manufacturing horticultural grade perlite, we offer a variety of sizes customized to specific needs in the horticulture industry. We implement proprietary systems to monitor and control the quality and consistency of our output and ensure uniformity in size and density over time.

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

Grades & Sizes

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Super Coarse

XLP Grade (OMRI®Listed)

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Propagation Grade (OMRI®Listed)

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Soil Mix Grade (OMRI®Listed)

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Plug Grade (OMRI®Listed)

Horticultural Grade Product Information

Supreme Perlite horticultural grade products are typically around 4.5 – 6.5 lb. per cu. ft. loose weight density. Product specifications and availability are subject to change without notice. Contact us for current sizes or to inquire about specialty grades.

Independently tested and verified.

Independently tested and verified.

Independently tested and verified.

Independently tested and verified.

Independently tested and verified.

Membership Associations

Organic Agriculture

Our agricultural and horticultural grade products are listed with various standards organizations for organic agriculture including the Organic Materials Research Institute (OMRI) and the California Department of Agriculture’s Organic Input Material Program (CDFA OIM). Organic certification ensures that our products are free of contamination from heavy metals and pathogens, and produced to the highest standard of purity and quality.

OMRI and CDFA Organic Logos

Contact Supreme Perlite