6 Gallons Large Pumice for Bonsai Soil, 3/8–1/4 Inch Volcanic Rock, Succulent and Cactus Soil Amendment, Natural Oregon Pumice

6 Gallons of Large Natural Oregon Pumice – 3/8" to 1/4"

Add larger-grade volcanic pumice to your custom soil blends with this 6-gallon package of clean, hand-screened pumice. Mined in the Southern Cascades Mountains of Oregon, our natural pumice contains no rocks, roots, or other debris.

Pumice is often called the "rock that floats" because it contains many tiny gaps and air pockets. Its larger particle size makes it a useful ingredient in specialty soil mixes for bonsai, succulents, cacti, and other plants.

Product Details

• Quantity: 6 gallons

• Particle size: 3/8" to 1/4"

• Material: Natural volcanic pumice

• Origin: Southern Cascades Mountains of Oregon

• Processing: Clean, hand-screened pumice

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

Container Fill Equivalent

Our 6-gallon box will fill approximately 12 trade-gallon containers.

Suggested Pumice Mixing Ratios

• General horticultural soil: Mix in 15% pumice for uses such as Japanese maples, raised beds, and containers.

• Water-sensitive plants: Use 30% pumice for Gunnera, Giant Sequoia, Daphne, Monkey Puzzle trees, Franklin trees, and other water-sensitive plants.

• Cactus and succulents: Use 60–80% pumice with 20–40% organic matter.

• Bonsai soil: Use 33% pumice, 33% coarse compost or bark, and 33% lava or very coarse sand.

These are suggested ratios; adjust your blend to suit your plants and growing conditions.

Shipping

This 6-gallon package ships by UPS.

Samples Available

Would you like to check the pumice size before ordering a larger quantity? Samples are available for the cost of shipping. Please note that a sample will not contain enough material for a project.

If you later order 6 gallons or more, we will reimburse the sample shipping cost. Leave a message in the Special Instructions to Seller at checkout with your qualifying order so we can refund the sample shipping charge.

Storage and Dust Precautions

The bag has a reusable tie so you can store unused pumice after opening. If the pumice dries before use, moisten it to help prevent dust from forming.

Safety note: Dust from rock or potting soil products should not be inhaled. It may irritate people with sensitive lungs.

A versatile natural pumice for building your own bonsai, cactus, succulent, and specialty horticultural soil blends