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

5 Quarts Horticultural-Grade Pumice – 3/8" to 1/16"

Create custom growing blends with natural horticultural-grade pumice mined in the Southern Cascades Mountains of Oregon. This pumice contains a blend of particle sizes from 3/8" to 1/16", along with some fines.

Our pumice is clean, with no rocks, roots, or other debris. It is suitable for mixing into growing media for bonsai, cactus, succulents, and many other specialty plants.

Why Use Pumice?

Often called the "rock that floats," pumice is a natural volcanic material with many tiny gaps and air pockets. It is a versatile ingredient for custom soil blends.

Recommended Mixing Ratios

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

• Water-sensitive plants: Use 30% pumice in mixes 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

• 5 quarts of pure pumice.

• One 5-quart box fills approximately 2.5 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 any 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.