Pumice

Frequently Asked Questions:

Q. Is the pumice you sell sterilised?

A. The short answer is that only the UXP Made Made Made Pumice is sterilised. For further information from the manufacturer see below

New Zealand Natural Pumice (washed and screened)

NZ Pumice is not sterile but fully conforms with AQIS import standards.

Australian Man-made Pumice (sterile)

When manufactured, is heated to 900 degrees rendering it functionally sterile.

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Using Pumice for Growing Plants

Pumice is a lightweight, porous volcanic rock that is highly beneficial for various types of plants, including bonsai, orchids, cacti, succulents, and other species. Its excellent drainage, aeration, and mineral content make it a versatile soil amendment.

1. Benefits of Pumice for Plants

• Drainage: Pumice prevents soil from becoming waterlogged, reducing the risk of root rot.
• Aeration: Its porous texture allows oxygen to reach plant roots, promoting healthy growth.
• Moisture Retention: Although it enhances drainage, pumice holds a small amount of water, providing consistent moisture without oversaturation.
• Mineral Enrichment: Pumice contains trace minerals like potassium, magnesium, calcium, and iron, which can benefit plant health.
• Lightweight: It's lighter than other soil amendments like gravel or sand, making it ideal for potted plants.

2. Using Pumice for Specific Plants

Bonsai

• Mix Ratio: Combine 25-50% pumice with akadama and lava rock or organic components.
• Why It Works: Promotes fine root development and prevents compacted soil.

Orchids

• Mix Ratio: 10-20% pumice with bark or sphagnum moss.
• Why It Works: Improves drainage and prevents root rot in epiphytic species.

Cacti & Succulents

• Mix Ratio: 50-70% pumice with potting soil or coarse sand.
• Why It Works: Provides superior drainage, preventing water retention that can cause root rot.

General Container Plants

• Mix Ratio: 10-30% pumice with regular potting soil.
• Why It Works: Improves soil texture, aeration, and root health.

3. How to Use Pumice

1. Rinse Before Use: Remove dust or debris.
2. Mix with Soil: Customize the ratio based on your plant’s needs.
3. Top Dressing: Apply a thin layer on the soil surface to improve moisture retention and aesthetics.
4. Propagation Medium: Use pure pumice for propagating cuttings or succulents.

4. Where to Buy Pumice

• Garden centers.
• Online retailers like Enfield Produce Pet & Garden Supplies.
• Specialty bonsai or orchid shops.

Final Tips

• Choose the correct pumice particle size (2-5mm for bonsai, finer for orchids).
• Combine with other amendments like perlite or vermiculite based on plant needs.
• Store in a dry place to prevent contamination.