Rockwool

How to Use Rockwool for Hydroponics

Rockwool is a highly efficient growing medium used in hydroponic systems due to its excellent water retention and aeration properties. It is available in different forms, including Grodan Rockwool slabs, Grodan Rockwool cubes, and Cultilene Rockwool, each designed for different stages of plant growth.

Preparing Rockwool for Hydroponics

1. Soak the Rockwool – Before use, submerge Rockwool cubes or slabs in pH-adjusted water (5.5–6.0) for a few hours to neutralize its naturally high pH.
2. Drain Excess Water – Avoid waterlogging by allowing proper drainage.
3. Place in Your System – Position Rockwool cubes in hydroponic trays, net pots, or NFT channels for optimal root development.

How to Start Seeds in Hydroponic Rockwool

1. Pre-soak the Cubes – Use pH-balanced water to maintain a suitable environment for seedlings.
2. Insert Seeds – Place one or two seeds into the centre of each Rockwool cube.
3. Maintain Moisture – Keep the cubes damp but not soaked to prevent fungal growth.
4. Provide Light & Humidity – Place seedlings in a warm, humid environment with proper lighting for strong early growth.
5. Transplant When Ready – Once roots emerge from the Rockwool cubes, transfer them into hydroponic systems using Grodan Rockwool slabs or Cultilene Rockwool for continued growth.

Using Rockwool in hydroponics ensures strong root support, improved oxygenation, and optimal moisture retention, making it a top choice for growers.