Grodan MM PM 40/40 Wrapped Rockwool Propagation Cube 40mm | 12 Pack

The Propagation Cube That Gets Cuttings & Seeds Off to the Right Start

Propagation is where grows are won or lost. Give your seeds and cuttings the best possible foundation with the Grodan MM PM 40/40 Wrapped Rockwool Propagation Cube — a compact, precision-engineered 40mm cube designed to drive downward root development, maintain the ideal air-to-water ratio, and integrate seamlessly into any hydroponic or multi-media system.

This listing is for a 12-pack of individually wrapped 40mm x 40mm x 40mm cubes, each with a pre-formed seeding hole — ready to soak and plant straight away.

Why Growers Choose Grodan MM PM 40/40 Cubes

• Pre-formed seeding hole — drop your seed or cutting straight in. No prep, no guesswork.
• Drives downward root growth — Grodan's fibre orientation encourages roots to grow down and out, producing stronger transplants with better strike rates.
• Optimal air-to-water ratio — mineral wool structure retains moisture while keeping oxygen at the root zone, reducing the risk of root problems.
• Wrapped for stability — outer wrap maintains cube shape during handling and transplanting, minimising root disturbance.
• Sterile & inert — free from unwanted organisms and contaminants. Won't interfere with your nutrient solution or pH.
• Universal compatibility — transplants directly onto Grodan blocks, slabs, coco, soil, or into aero and DWC systems.
• Spun from natural basalt & limestone — pH-stable, consistent quality cube to cube.

How to Use

Pre-soak cubes in pH-adjusted water or dilute nutrient solution (pH 5.5–6.0) for 30–60 minutes before use. Place your seed or cutting into the pre-formed hole, then position in your propagation tray or dome. Once roots are visible at the base, transplant directly onto your chosen growing medium — no need to remove the cube.

Specs

• Dimensions: 40mm x 40mm x 40mm
• Pack size: 12 cubes
• Material: Mineral wool (basalt & limestone)
• Hole: Yes — pre-formed seeding hole
• Wrapping: Yes — individually wrapped
• System compatibility: Hydroponic, soil, coco, aero, DWC

Perfect For

Home growers and commercial propagators who want a reliable, consistent rockwool cube for seeds and cuttings. The 40mm size is the industry standard for propagation — compact enough to fit standard propagation trays and domes, large enough to support healthy root development before transplant.

In stock and ready to ship. Add to cart and start your next grow strong.