Commonly known as: Lava Stones, Lava Rock
Product type: Volcanic mineral growing medium
Lava stones are a natural volcanic material widely used in plant care to improve drainage, aeration, and overall root health. This 1–10 mm mixed grade offers a versatile size range that works well for indoor plants, providing structure without compacting over time.
Unlike organic components, lava stone does not break down or compress. This helps maintain consistent airflow through the potting mix, which is especially important for indoor plants where soil tends to stay wet for longer periods. The porous surface of each stone also holds small amounts of moisture, making water more accessible to roots without creating soggy conditions.
The varied particle size in this mix allows finer pieces to fill gaps while larger fragments maintain open air pockets. This balance makes lava stones particularly useful as a long-term amendment in potting mixes, drainage layers, or custom blends where stability is key.
Because lava stones are inert and chemically neutral, they do not alter soil pH or release salts, making them suitable for a wide range of indoor plants and growing styles.
Lava Stones Uses
Water Management – How do they affect watering?
They allow excess water to drain freely while holding small amounts of moisture on their porous surfaces. This helps reduce the risk of root rot while maintaining consistent moisture availability.
Use – What are lava stones best used for?
Lava stones are ideal for improving drainage and airflow in indoor potting mixes, as a base layer in pots, or as a structural component in custom soil blends.
Aeration – Why are lava rocks good for roots?
The irregular shape and hardness of lava stones prevent compaction, keeping air channels open so roots remain well oxygenated.
Mixing – How should lava rocks be used in potting mixes?
They can be mixed directly into potting soil to improve structure or used as a drainage layer at the bottom of pots. The 1–10 mm range makes them flexible for different applications.
Longevity – Do lava rocks break down over time?
No. Lava stones are extremely durable and do not decompose or compact, making them a long-term solution for plant care.
Safety – Are they safe for plants?
Yes. Lava stones are inert, non-toxic, and safe for both indoor and outdoor plant use.
FAQ’s
Q: Why use lava rocks instead of gravel?
Lava stones are lighter, more porous, and provide better airflow around roots.
Q: Is the 1–10 mm size suitable for indoor plants?
Yes. This mixed grade works well for general indoor use and potting mixes.
Q: Do lava rocks contain nutrients?
No. Lava stones are inert and provide structure only. Nutrients must be added separately.
Q: Should lava stones be rinsed before use?
Yes. Rinsing removes dust and prepares them for use in pots or mixes.
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