Description
Rockwool 42/40 Hole 75 mm Propagation Block
Premium Grodan Delta 4G rockwool block—75×75×60 mm with a 42×40 mm centered hole. Made from mineral wool spun from basalt and limestone, this block offers exceptional water retention and balanced aeration for root development. Individually wrapped with grooved base for optimal drainage, it's perfect for seedlings, cuttings, and mid-stage transplant
🔧 Features
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Optimized size – 75 × 75 × 60 mm (3″ × 3″ × 2.5″) block with 42 mm hole
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Grodan Delta technology – Ensures ideal air‑to‑water balance, even moisture distribution, and strong structural support
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Individually wrapped – Maintains moisture, hygiene, and ease of handling
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Grooved drainage base – Promotes improved water outflow and prevents root rot
📈 Why You Should Buy
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Perfect for propagation – Seamlessly transition from seedlings or plugs into mid-growth environment
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Consistent performance – Uniform density and firm texture withstand mechanised handling
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Safe and sterile – Inert, pH-neutral substrate that supports precise nutrient control and food-safe production
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Versatile use – Compatible with other Grodan products like starter cubes or slabs for scalability
💡 Usage & Installation Tips
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Pre-soak in pH-adjusted water (5.5–6.5) to stabilize and ensure even moisture distribution
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Insert rooted plug or seed into the hole, then place on tray or slab
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Maintain moisture—keep damp but not waterlogged; allow slight drying between irrigations to prevent root issues
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Ideal for ebb‑and‑flow, drip systems, or hand-watering setups
❓ FAQs
Q: Is this reusable?
A: No—designed for single use to maintain sterility and optimal plant health.
Q: What crops are best suited?
A: Ideal for a wide range of seedlings and cuttings—herbs, salad greens, strawberries, peppers, and more
Q: How does the hole benefit growth?
A: It lets you insert smaller starter plugs for efficient transplanting and root development.
Q: Is Rockwool safe for food horticulture?
A: Yes—it's inert, sterile, and widely used in commercial food-crop production