High-Quality Rockwool Blocks for Reliable Propagation & Growth

The Block-BIG 15x15x15cm Rockwool Block is a premium-grade grow medium designed to support strong, healthy root development from propagation through to the vegetative stage. Each block features a centrally pre-drilled 38/35mm hole, perfectly sized for inserting standard propagation cubes or rooted clones with minimal disturbance.

With excellent water retention and air porosity, these blocks provide a consistent and stable environment for rapid root expansion, making them ideal for use in both hydroponic and traditional growing systems. This case of 40 blocks ensures cost-effective scalability for commercial growers or hobbyists running multi-plant setups.

Key Features:

• Dimensions per block: 15cm x 15cm x 15cm

• Pre-Drilled Hole Size: 38mm diameter / 35mm deep – fits standard propagation plugs

• Material: High-density Rockwool – inert, pH-neutral, and sterile

• Water & Air Balance: Optimised for fast root development and nutrient uptake

• Use Case: Suitable for hydroponics, NFT, flood & drain, or drip systems

• Pack Size: CASE of 40 blocks – bulk convenience for large-scale grows

What the Package Contains:

• 40 x Block-BIG 15x15x15cm Rockwool Blocks with 38/35mm pre-drilled holes

• Supplied in a protective carton for clean, easy storage

How to Use the Product & Best Usage Recommendations:

Before use, soak each Rockwool block in pH-adjusted water (around 5.5–6.0) for several hours to stabilise the pH and flush out any natural alkalinity. Once soaked, insert your propagation cube or rooted cutting into the pre-drilled hole and place the block in your system.

Monitor moisture levels closely—Rockwool retains water well but should not stay overly saturated. Ideal for transitioning young plants from propagation trays to larger hydroponic setups or soil containers. Use with nutrient solutions appropriate for your plant’s growth stage.

Store unused blocks in a dry, clean area to prevent contamination.