Fine Black Lava Rock 1/8"-3/16" by The Bonsai Supply - 24lb

Create high-performance bonsai soil mixes with Fine Black Lava Rock by The Bonsai Supply. Carefully screened to a particle size of 1/8"–3/16", this premium volcanic substrate delivers excellent drainage, aeration, and long-term structural stability while providing a finer texture ideal for smaller bonsai and refined root systems.

The smaller particle size makes this grade particularly well suited for shohin bonsai, deciduous trees, tropical species, and refined specimens where a more compact soil profile is preferred without sacrificing oxygen availability or drainage performance.

Unlike organic components that break down over time, lava rock maintains its structure for years, helping preserve consistent soil performance and healthy root development between repotting cycles.

The 24 lb bag provides enough material for multiple repotting projects, custom soil blends, and seasonal soil preparation.

Features

• Premium volcanic substrate screened specifically for bonsai use
• Excellent drainage and aeration characteristics
• Fine particle size ideal for smaller containers and refined trees
• Maintains soil structure and resists compaction over time
• Encourages healthy root growth and oxygen exchange
• Reusable after cleaning and screening

Ideal For

• Shohin bonsai
• Deciduous bonsai species
• Tropical bonsai species
• Refined bonsai trees
• Custom bonsai soil blends
• Increasing aeration in finer soil mixes

Specifications

• Brand: The Bonsai Supply
• Product Type: Black lava rock
• Particle Size: 1/8"–3/16"
• Grade: Fine
• Weight: 24 lb
• Use: Soil component and drainage enhancement
• Suitable For: Bonsai soil blends and refinement projects

Healthy bonsai start with healthy roots, and fine black lava rock provides the balance of drainage, aeration, and durability needed to support long-term success in smaller and more refined trees.