10 Cups Horticultural Pumice, 3/8" to 1/16" Volcanic Pumice for Bonsai, Cactus, Succulents and Potting Soil

10 Cups Horticultural-Grade Pumice – 3/8" to 1/16"

Improve drainage and customize your growing medium with natural horticultural-grade pumice from the Southern Cascades Mountains of Oregon.

This pumice contains a blend of particle sizes ranging from 3/8" to 1/16", along with some fines. It is ideal for creating custom soil mixes for bonsai, cactus, succulents, and other specialty plants.

Our pumice is clean and hand-screened, with no rocks, roots, or other debris.

Why Use Pumice?

Often called the "rock that floats," pumice is a natural volcanic material containing many tiny gaps and air pockets. It is a versatile ingredient for custom potting and growing mixes.

Recommended Mixing Ratios

Use these suggested ratios when preparing your own soil blends:

• General horticultural use: Mix 15% pumice into soil for Japanese maples, raised beds, and containers.

• Water-sensitive plants: Use 30% pumice for Gunnera, Giant Sequoia, Sophora, 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: Combine equal parts pumice, coarse compost, bark, and black lava or coarse sand.

Package Size

• 10 cups of pure pumice.

• One 10-cup box fills approximately 1.33 trade-gallon containers.

Shipping

• Ships by USPS Priority Mail.

• Shipping is included in the price.

Hand-Packed for Convenient Storage

Our pumice is hand-packed in a bag with a reusable tie, making it easy to store unused material after opening.

Handling and Dust Precautions

If the pumice dries before use, 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.

From Our Oregon Nursery

We are a commercial wholesale and retail plant nursery with over 30 years of experience mixing specialty potting mixes. Browse our other listings for additional custom growing materials for bonsai and specialty plants.