Grodan Delta Rockwool Block 4” – Stonewool Grow Block for Hydroponic Systems (Large or Small Hole)

Grodan Delta Rockwool Block – 4" | Premium Rooting Block for Propagation & Transplant

Ideal for seedlings, cuttings, and young plants | Clean, consistent, high-performance media

The Grodan Delta 4" Rockwool Block is a trusted propagation and transplant medium used by commercial and hobby growers worldwide. Made from spun volcanic rock, this high-quality block offers exceptional water retention, aeration, and root development, making it the perfect foundation for healthy plant growth.

Each 4" Delta block features a pre-formed planting hole and is wrapped in UV-resistant plastic to maintain shape and moisture. Ideal for use in hydroponics, NFT, flood and drain systems, or as part of a multi-stage propagation setup.

Key Benefits:

• Promotes rapid root development and strong structure
• Pre-drilled hole for easy insertion of plugs or cuttings
• Excellent water and air retention balance for optimal oxygen to roots
• Inert, pH-stable, and sterile – perfect for disease-free starts
• Suitable for seeds, cuttings, and transplants
• Can be used alone or placed into larger slabs or hydro systems

Specifications:

• Size: 4" x 4" x 2.5" (100mm x 100mm x 65mm)
• Hole size fits most propagation plugs (such as Root Riot or Jiffy)
• Wrapped for structural support and easy handling

How to Use:

1. Soak in pH-adjusted water (around 5.5–5.8) before use
2. Insert seedling, cutting, or propagation plug
3. Keep consistently moist but not saturated
4. Transplant into a larger hydro system or growing medium once roots emerge

Start strong with Grodan Delta 4" Rockwool Blocks – available now at GoGrow.co.uk. The professional choice for clean, reliable propagation and transplanting success.