Grodan 4" Rockwool Cube — Strip of 6

Grodan 4" Rockwool Large Cube — Strip of 6

Grodan's 4-inch rockwool cubes in a strip of 6 — the standard step-up medium for transplanting rooted cuttings and seedlings from smaller propagation blocks into the vegetative stage. Holds water and air perfectly for established young plants.

Why growers choose Grodan 4" cubes:

• Perfect transplant size from propagation blocks — the large hole fits rockwool starter cubes seamlessly
• 4" (10cm) cube — the right volume for veg-stage root development before transferring to final pots
• Grodan brand — the industry-standard rockwool, consistent density and drainage
• Strip of 6 — buys enough for a small propagation batch, or top-up for a larger one
• Excellent water-to-air balance — roots get moisture without drowning

Who it's not for:

For seed-starting or cuttings, use the smaller 3" rockwool with large hole — these 4" cubes are for the next stage up. Rockwool needs pre-soaking and pH adjustment (pH 5.5) before planting; don't plant directly into a dry cube.

In stock now — ships same working day from our Staffordshire warehouse with free UK delivery over £100. Pick up in-store at our Stone shop (ST15 0SR) if you're local, or click & collect at checkout.