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

Give seeds and cuttings a fine-textured mineral growing medium with Propagation Grade Pumice, a natural volcanic product mined in the Southern Cascades Mountains of Oregon.

This hand-screened pumice is ideal for seed-starting mixes, cutting propagation, and specialty potting soil blends. It contains particles approximately 1/8" to 1/64" along with fines, making it a useful ingredient for growers who want to customize their own propagation mix.

Product Details

• Material: Natural volcanic pumice

• Particle Size: Approximately 1/8"–1/64"

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

• Fines: Included

• Origin: Southern Cascades Mountains of Oregon

• Appearance: Natural pumice with tiny air pockets

• Clean Material: No rocks, roots, or other debris

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

Recommended Uses

This fine-grade pumice is suitable for:

• Seed-starting mixes

• Cutting propagation

• Specialty potting soil

• Custom propagation blends

Suggested Mixing Ratio: Add approximately 15%–30% pumice to a peat/perlite-based mix.

Choose Your Pumice Screening Grade

Looking for a different amount of fines? We offer additional screening options:

• Propagation Grade With Fines: This listing. Hand-screened to remove material over 1/8", with fines included.

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

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

Please select the appropriate screening grade for your project.

Screening Note: Hand-screening removes rocks over 1/8". It does not guarantee that every long or narrow particle larger than that measurement will be removed.

Available Package Sizes

Choose from:

• 15 oz

• 10 cups

• 5 quarts

• 3 gallons

• 6 gallons

• 12 gallons

• 18 gallons

• 24 gallons

Approximate Container Fill Conversions

These are approximate fill conversions.

Samples Available

If you want to check the material before purchasing a larger quantity, samples are available for the cost of shipping.

Samples are intended to show the appearance and texture of the pumice, not to provide enough material for a complete project.

If you order 6 gallons or more, the sample freight cost will be reimbursed.

Shipping Information

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

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

• All prices include shipping.

Natural Material and Packaging Notes

Pumice is a natural volcanic material. It is an organic material that continuously breaks down, and some additional fines may occur during shipping.

Our pumice is hand-packed in bags with a reusable tie for convenient storage after opening.

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

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