Large-Size Horticultural Pumice – 3/8"+ to 1/4"+

Natural Volcanic Rock for Bonsai, Succulents, Cactus and Specialty Soil Mixes

Looking for a larger-size pumice for your specialty potting mix? This hand-screened volcanic pumice is ideal for growers who prefer larger particles for bonsai soil, cactus and succulent mixes, and other horticultural applications.

Mined in the Southern Cascades Mountains of Oregon, our natural pumice is carefully selected and hand-screened. You receive clean pumice without rocks, roots, or other debris.

Known as the "rock that floats," pumice contains countless tiny gaps and air pockets, making it a useful component in specialty growing media.

Product Details

• Product: Natural volcanic pumice

• Particle Size: Approximately 3/8"+ to 1/4"+

• Processing: Hand-screened

• Origin: Southern Cascades Mountains, Oregon

• Material: Clean natural pumice

• Contents: No rocks, roots, or other debris

• Packaging: Hand-packed bag with reusable tie for convenient storage

Recommended Pumice Mixing Ratios

Use these suggested ratios as a starting point for your growing medium:

General Horticultural Mix – 15% Pumice

Add approximately 15% pumice to soil mixes for general horticultural use, including:

• Japanese maples

• Raised beds

• Container planting

Water-Sensitive Plants – 30% Pumice

Use approximately 30% pumice in mixes for:

• Gunnera

• Giant Sequoia

• Daphne

• Monkey Puzzle trees

• Franklin trees

• Other water-sensitive plants

Cactus and Succulent Mix – 60–80% Pumice

Combine:

• 60–80% pumice

• 20–40% organic matter

Bonsai Soil Mix – Equal-Third Blend

A suggested bonsai mix consists of:

• 33% pumice

• 33% coarse compost or bark

• 33% lava rock or very coarse sand

These are suggested mix proportions; adjust the blend to suit your plants and growing conditions.

Available Package Sizes

Choose the quantity that works for your project:

• 15 oz

• 10 cups

• 5 quarts

• 3 gallons

• 6 gallons

Trade-Gallon Fill Conversions

Our package volumes can fill larger trade-gallon nursery containers:

These are approximate fill conversions, not changes to the actual package volume.

Shipping Information

• 15 oz: First Class shipping

• 10 cups: Priority Mail

• 5 quarts: Priority Mail

• 3 gallons: UPS

• 6 gallons: UPS

Want to Check the Particle Size First?

Samples are available for the cost of shipping so you can see exactly what size pumice you will receive.

Please note:

• Samples are intended for evaluating the material, not completing a project.

• If you subsequently order 6 gallons or more, sample shipping costs will be reimbursed.

• Leave a message in Special Instructions to Seller when placing your qualifying order so we can refund the sample shipping cost.

Packaging and Handling

Pumice is hand-packed in a bag with a reusable tie, making it convenient to store after opening.

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 and may irritate people with sensitive lungs.

Choose this larger-size Oregon volcanic pumice for your next bonsai, cactus, succulent, or specialty horticultural soil project.