Black Lava Rock

Black Lava is a high-quality volcanic mineral substrate widely used in professional horticulture and aroid cultivation. Its porous, lightweight structure provides excellent airflow around the roots while retaining enough moisture to support steady, controlled hydration.

This size fraction (2-8 mm) is ideal for mixing into aroid substrates, improving drainage and oxygen availability without compacting over time. The hard volcanic structure does not break down, making it a durable and stable component for long-term cultivation.

Black lava is pH-stable, inert, and free of added nutrients, allowing full control over fertilisation, EC, and pH through your watering routine. It is suitable for both organic-based mixes and fully mineral substrates, and works well in traditional top-watering setups as well as semi-hydro or hybrid systems.

Key features

• Particle size: 2–8 mm
• Volcanic, porous structure for optimal root aeration
• Improves drainage and prevents waterlogging
• Stable pH, inert, and nutrient-free
• Does not compact or decompose
  

Common uses

• Component in aroid and Anthurium mixes, as well as cacti and succulents
• Drainage layer or structural mineral additive
• Improving airflow and root health in pots

Particle size: ~2–8 mm

Packaging

Packed in resealable ziplock bags. Sold per 2 and 5 liters. Higher quantities are packed in appropriately sized bags based on the total ordered quantity.

Bulk discount

Save more when buying multiple 5L units - discounts increase with higher quantities (see table below). Bulk discounts apply only to the 5L option and do not apply to the 2L volume.