Description
Grodan Rockwool Propagation Cubes – The Gold Standard for Seed Starting & Cloning
Rockwool Cube 75 x 75 Professional-Grade Starter Blocks for Perfect Root Development
Give your seeds and cuttings the ideal launchpad with Grodan Rockwool Cubes, the #1 choice of commercial growers for faster germination, stronger roots, and higher survival rates. These 75mm x 75mm cubes provide the perfect balance of aeration and moisture retention, creating an optimized microenvironment for young plants to thrive.
Why Professional Growers Trust Grodan Rockwool
🌱 Superior Root Development – Air-filled porosity prevents suffocation while holding just the right moisture
🌡️ Stable Temperature & pH – Neutral pH (7.0) with excellent thermal insulation
💧 Smart Water Management – Holds 18x its weight in water without waterlogging
🔬 Lab-Tested Consistency – No hotspots or dry zones like cheap knockoffs
✂️ Customizable Planting – No pre-drilled hole = perfect fit for any seed or cutting
Key Benefits at a Glance
✔ Faster germination & rooting – Up to 30% quicker than soil
✔ Prevents damping-off disease – Sterile medium stops fungal issues
✔ Versatile design – Indent for large seeds, flat side for tiny seeds/clones
✔ Easy transplanting – Move cubes directly to hydroponics or soil
✔ Trusted by pros – Used in commercial nurseries worldwide
How to Use Rockwool Cube 75 x 75 for Best Results
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Pre-soak cubes in pH-adjusted water (5.5-6.0 for hydroponics)
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Create custom hole (match your seed/cutting size)
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Insert seed/clone – Depth depends on plant type
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Maintain 70-80% humidity until roots establish
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Transplant whole cube – No root disturbance!
Perfect For:
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Seed starting (tomatoes, peppers, cannabis, flowers)
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Cloning (herbs, ornamentals, cannabis cuttings)
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Hydroponic propagation (NFT, DWC, aeroponics)
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Commercial nurseries (uniform crop starts)
Why Cheap Cubes Fail Where Grodan Succeeds
"After wasting money on generic rockwool that molded or dried unevenly, I switched to Grodan 75mm cubes. Now my germination rates are 95%+, and clones root 2-3 days faster!" – Carlos M., Propagation Specialist
Frequently Asked Questions
Q: Do I need to pH adjust rockwool?
A: Yes! Soak in pH 5.5-6.0 water before use (neutralizes natural alkalinity).
Q: How often should I water?
A: When top appears dry—rockwool holds moisture longer than soil.
Q: Can I reuse these?
A: Not recommended—sterility is key for propagation.
Q: Why no pre-drilled hole?
A: Lets you customize hole size for perfect seed/clone fit.
The Grower’s Secret for Flawless Propagation
Why risk poor germination or weak roots? Grodan 75mm Cubes give you:
✅ Lab-quality consistency
✅ Faster, stronger starts
✅ Seamless transplanting