OMRI Horticultural Pumice
OMRI Listed Pumice for Organic Gardening and Bonsai
Horticultural Pumice for Organic Gardening and Bonsai

OMRI Horticultural Pumice

Price range: $25.00 through $40.00

Our OMRI Listed Horticultural Pumice is considered a superior gardening amendment due to its highly porous, lightweight volcanic structure, which provides unmatched soil aeration, excellent drainage, and moisture regulation without breaking down. Unlike perlite, it does not float to the surface, and it is more durable and water-retentive than lava rock. 
Key benefits of pumice for gardening include:
  • Superior Aeration & Drainage: Its porous, air-filled structure prevents soil compaction, ensuring roots get enough oxygen while preventing waterlogged roots that lead to rot.
  • Moisture & Nutrient Retention: It acts like a microscopic sponge, holding onto water and nutrients and releasing them slowly, which can reduce watering needs.
  • Structural Stability: It does not break down, decompose, or degrade, providing long-lasting soil structure for years.
  • Prevents Compaction: Unlike other materials that may degrade over time, its light, rigid nature prevents heavy soils from compacting.
  • Ideal for Succulents & Cacti: It is highly recommended for succulents , bonsai and cacti because it provides the perfect balance of drainage and moisture retention.
  • Ideal for improving heavy clay soils: in Oklahoma , Texas , New Mexico , Arizona.
  • Neutral pH: It does not affect the pH level of the soil.
  • Functional Mulch: It makes a great top-layer mulch, as it is heavy enough not to blow away, manages soil temperature, and keeps the surface dry, which can help control gnats. 
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Description

OMRI Listed Horticultural Pumice – Professional Grade

Our Horticultural Pumice is the premier choice for organic farming, Bonsai training, and cactus collections. Sourced from premium volcanic deposits in NM and CA, this 100% natural stone provides permanent aeration that never fails. It is the ultimate soil amendment for indoor grow tents, raised beds, and commercial fruit production. Whether you are building a living soil mix in Oklahoma or prepping a garden in Texas, our pumice ensures roots thrive. This volcanic rock is superior to perlite because it does not float, shatter, or crush over time, making it a permanent solution for your soil structure and drainage needs.

Premium Growing Benefits:

  • Universal Use: Perfect for Cacti, Bonsai, and Garden Vegetables.
  • Permanent Aeration: Unlike perlite, it never breaks down or floats.
  • Organic Certified: 100% OMRI Listed for organic production.
  • Nutrient Retention: Holds moisture and nutrients in microscopic pores.
  • Retail Sizes: Fast shipping in 4qt, 8qt, 12qt, 20qt, and 50qt boxes.

How to Use Horticultural Pumice:

For most succulents and cacti, we recommend a mix of  60% pumice, 40% organic potting soil. For specialized Bonsai training, we recommend 33% pumice, 33% Organic soil, 33% Akadama for maximum drainage and root control. You can view our other cactus supplies and plants here on our main shop page. This product is officially OMRI Listed for use in certified organic operations, ensuring the highest safety standards for your food and hobby plants. Because it is a natural volcanic glass, it provides a grit that discourages soil pests while maintaining a neutral pH for your delicate root systems.

Looking for larger quantities?


Inquire About Bulk Delivery

We offer local 14-yard trailer and 80-yard semi-truck loads for large projects across the region.

Additional information

Weight N/A
Dimensions N/A
Horticultural Pumice size

3/16, 3/8, Fines, mix box
Box Size

5 Quarts, 20 Quarts

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