Grodan 3" Rockwool Cube — Large Hole, Seedlings & Cuttings

Grodan 3" Rockwool Cube — Large Hole, Seedlings & Cuttings

Grodan 3-inch rockwool cubes with a large central hole — sized to accept rockwool propagation starter plugs (the small 1-inch cubes where seeds germinate or cuttings first root). The standard "second stage" rockwool for hydroponic growers.

Why growers choose Grodan 3" cubes:

• Large hole accepts starter plugs — seamless transfer from propagation to veg stage
• 3" (7.5cm) cube size — right for young vegetative plants before the 4" step-up
• Grodan consistency — reliable density and drainage across every batch
• Ideal for seedlings and newly-rooted cuttings — matches the rooting strength of small plants

Who it's not for:

For mature veg plants or flowering transplants, the 4" large cube holds more water and is better sized. Rockwool needs soaking in pH 5.5 water for 24 hours before use; never plant 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.