Propagation Grade Pumice – 1/8" to 1/64" With Fines

For Seed Starting, Cuttings, and Custom Potting Mixes

Give your propagation and potting projects a natural volcanic ingredient. This fine-grade pumice is hand-screened to remove pieces larger than 1/8 inch, making it a useful component for seed-starting mixes, cutting propagation, and custom soil blends.

This grade includes fines and is recommended as an addition to peat/perlite-based mixes at a rate of approximately 15%–30%.

Product Details

• Material: Natural volcanic pumice

• Particle size: 1/8" to 1/64", with fines

• Screening: Hand-screened to remove pumice larger than 1/8"

• Origin: Southern Cascade Mountains of Oregon

• Suggested use: Seed-starting mixes, cutting propagation, and potting soil blends

• Suggested mix ratio: Add 15%–30% to a peat/perlite-based mix

• Packaging: Hand-packed bags with reusable ties

Pumice is sometimes called the "rock that floats" because its volcanic structure contains many tiny gaps and air pockets.

Choose Your Pumice Grade

Need a different amount of fines? We offer three screening options:

• Propagation Grade – With Fines: This listing. Includes fines and is hand-screened to remove pieces over 1/8".

• Double-Screened: Removes over 50% of the fines in this mix.

• Triple-Screened: Removes over 90% of the fines in this mix.

Please note that hand-screening removes larger rocks, but long, narrow pieces may occasionally pass through.

Natural Material and Particle Variation

Pumice is a natural organic material that can continuously break down. Some fines may develop during shipping, so the material you receive may contain additional fine particles.

Our pumice is mined in Oregon's Southern Cascade Mountains. It is clean pumice without rocks, roots, or other debris.

Available Quantities

Choose from:

• 15 oz

• 10 cups

• 5 quarts

• 3 gallons

• 6 gallons

• 12 gallons

• 18 gallons

• 24 gallons

Approximate Trade-Gallon Fill Equivalents

These figures describe approximate container fill equivalents.

Shipping

All prices include shipping.

• 15 oz, 10 cups, 5 quarts, and 3 gallons: USPS Ground Advantage

• 6, 12, 18, and 24 gallons: USPS Priority Mail or UPS

Orders are hand-packed in bags with reusable ties for convenient storage after opening.

Samples Available

If you would like to inspect the particle size before purchasing a larger quantity, samples are available for the cost of shipping.

If you subsequently order 6 gallons or more, the sample shipping cost will be reimbursed. Please let us know when placing your qualifying order.

Handling and Storage

If the pumice dries before use, lightly moisten it to help prevent dust from forming.

Dust from rock and potting-soil products should not be inhaled. It may irritate people with sensitive lungs. Handle carefully and avoid creating airborne dust.

Thank you for supporting our nursery and specialty soil-mix products!