Double Screened Propagation Pumice, 1/8–1/64 Inch Volcanic Pumice, Seed Starting Soil Amendment, Cutting Propagation Growing Medium

Give your seed-starting and cutting-propagation mixes a carefully screened mineral ingredient with our Double-Screened Propagation Grade Pumice.

This natural volcanic pumice has a particle size of approximately 1/8 to 1/64 inch. It is hand screened to remove oversized particles larger than 1/8 inch, then double screened to remove some—but not all—of the fine particles.

Why Choose Double-Screened Pumice?

• Particle size: 1/8–1/64 inch

• Screening: Double screened

• Fines: Some fines remain

• Oversized particles: Hand screened to remove pumice larger than 1/8 inch

• Origin: Southern Cascades Mountains of Oregon

• Quality: Clean pumice without rocks, roots, or other debris

Suggested Uses

This propagation-grade pumice is ideal for:

• Seed-starting mixes

• Cutting propagation blends

• Specialty growing media

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

Available Package Sizes

• 15 oz

• 10 cups

• 5 quarts

• 3 gallons

• 6 gallons

Container Fill Conversions

These conversions help estimate how many trade-gallon containers each package can fill.

Shipping Information

• 15 oz: USPS Ground Advantage

• 10 cups, 5 quarts, and 3 gallons: USPS Priority Mail

• 6 gallons: UPS

Natural Oregon Volcanic Pumice

Sometimes called the "rock that floats," pumice is a natural volcanic material containing many tiny gaps and air pockets.

Our pumice is mined in the Southern Cascades Mountains of Oregon and hand packed in bags with reusable ties for convenient storage after opening.

Handling & Storage

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

Avoid inhaling dust from rock or potting soil products. Dust may irritate people with sensitive lungs.

Thank you for choosing our specialty nursery products!