Lava Rock - SYBASoil

Lava Rock – Structure, drainage and root health

Lava rock is a naturally porous volcanic rock that promotes air circulation, improves drainage and regulates moisture in the soil. Rich in minerals such as iron, magnesium and calcium, it brings stability and essential nutrients to the roots of houseplants, terrariums and succulent gardens.

Key benefits

• Improves aeration and water circulation in the substrate
• Provides a heavy, stable support for tall or fragile plants
• Retains moisture and releases it gradually
• Rich in micronutrients beneficial to root growth
• Can be used as a drainage layer, substrate or decorative mulch
• Inert, odourless and reusable

Synergy with organic amendments

Combined with vermicompost or other organic amendments, lava rock slowly releases its minerals, while microbes convert these elements into nutrients that plants can absorb. This creates a stable, balanced, nutrient-rich environment that stimulates root growth and health.

Recommended applications

• In the soil: 2 to 5% mixed into potting soil to improve drainage and structure.
• With vermicompost: mix 1 part worm castings with 4–5 parts soil and 0.5 part lava rock for a balanced substrate.
• Terrariums: 1 to 2 cm as a drainage layer beneath the substrate to prevent rot and ensure water and air circulation.
• Mulch: top layer to retain moisture, limit fungus gnats and reduce soil compaction.

Why Sybotanica recommends lava rock

At Sybotanica, we choose lava rock that is clean, sieved and ready to use. It gives the substrate a durable structure, leaves room for organic amendments to do their work and gives roots access to a nutrient-rich environment that stays stable over the long term.

Product values (FR)

• Country of origin: Germany
• Suitable for organic farming: Yes
• Structural stability: Years, does not break down
• EC: 0.21 mS/cm
• pH: 6.4
• Water retention capacity: 17.9%
• Safe for animals/reptiles: may be harmful if swallowed

FAQ – 5 common questions

1. Can I use it with all types of plants? Yes, from succulents to tropical plants and terrariums.
2. Is it a substitute for fertilising? No, it supplies minerals but does not replace feeding.
3. How much lava rock in a terrarium? 1 to 2 cm as a drainage layer beneath the substrate.
4. Can it be reused? Yes, it is durable and rinses easily for repeated use.
5. What are the decorative benefits? Natural texture, visual contrast and an attractive finish for terrariums and pots.