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Rockwool Cubes

44 reviews
Number of Cubes
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What would happen if you heated up basalt (a naturally occuring volcanic rock) to the point where it becomes liquid and decided to spin it like fairy floss? You would end up with an awesome hydroponic soilless substrate! These rockwool cubes are exactly that, with the outcome being a super light, and absorbant hydroponic growing substrate that maintains perfect aeration and moisture levels at all stages of plant growth.

Features

Rockwool is the ideal growth medium for germinating most types of seeds, propagating cuttings or even growing transplants. High success rates mean you spend less time struggling and more time growing!

These mats are made by Grodan - the market leader in rockwool.  The substrates from Grodan are the only stone wool growing media awarded an EU Ecolabel

Specifications

Specifications

Dimensions of each cube: 4cm (h) x 2cm (w) x 2cm (l)

  • Tapered cubes to fit into netcups
  • Small indents for cuttings and seeds.
  • Can easily be broken up by hand or with a scissor.
  • Available in 12, 36 or 72 packs for better value.
  • When basalt is turned into rockwool, it multiplies in volume by 68x, making it incredibly resource efficient.
  • Contains no harmful chemicals, weeds, diseased soil or pests.
  • Pathogen free.

Compatible products

You can use them in a range of Urban Plant Growers products including:

We've got an awesome blog post on hydroponic growth mediums that might help you learn more!

Instructions

How to use rockwool cubes

To use these simply soak them in water for 10 minutes before planting two or three seeds (its always good to have a backup) per rockwool cube. The cubes can be partially submerged in water, or bottom irrigated with a trickle of water to keep them moist. Note that they don't need much water as they're super absorbent!

When the roots start to grow out of the cubes, then you can place the cubes within another growth medium, soil, or directly in water and let them grow!

Customer Reviews
4.7 Based on 44 Reviews
5 ★
82% 
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4 ★
14% 
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2% 
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Filter Reviews:
    Urban Plant Growers Rockwool Cubes Review
    26/12/2022

    Best rock cubes on the market

    There are many rock cubes out there but Urban Plant Growers cubes are of the highest quality and frankly, all my seeds grow better in these than anything else. Recommend you buy a large pack so save money and time.

    DS
    Deborah S.
    Australia Australia
    Urban Plant Growers Rockwool Cubes Review
    13/11/2022

    Plants succeed every time!

    This has transformed the way I grow seedling, never had a plant fail. I either leave them in the hydroponic bay or remove them with their little rock wool core intact and transfer them successfully to the garden.

    MN
    Mindy N.
    Australia Australia
    Urban Plant Growers Rockwool Cubes Review
    06/09/2022

    Oops!

    Good but tends to go green after a while.

    RB
    REBECCA B.
    Australia Australia
    Urban Plant Growers Rockwool Cubes Review
    23/08/2022

    Great

    So Fast delivered in 48 hour’s

    GJ
    Glenn J.
    Australia Australia
    Urban Plant Growers Rockwool Cubes ReviewUrban Plant Growers Rockwool Cubes Review
    01/05/2022

    Rock cubes

    The cubes are mostly working but some get infiltrated with algae and go dark green. I also don't know what the little mites all over the plants are and how to get rid of them. I could attach some photos if there was an option to do so.

    KE
    Keryl E.
    Australia Australia
    30/01/2023

    Does what it should

    Quick dispatch of order. Rockwool cubes are easy to break apart and work perfectly with my eco kitchen.

    CS
    Catherine S.
    Australia
    15/01/2023

    Great cubes - easy to use

    Would recommend these cubes. Easy for the plants to send roots through them.

    AL
    Amy L.
    Australia Australia
    09/01/2023

    UPGrowers Eco Kitchen

    Love this product! I am amazed at how fast and healthy anything grows in this. Recommended to absolutely anyone as its so easy to use.

    MC
    michele c.
    Australia Australia
    26/11/2022

    Great product

    Great quality

    TW
    tania w.
    Australia Australia
    12/11/2022

    Easy to use .

    Brilliant growing medium. I would highly recommend anyone using the rockwool cubes.

    HL
    Heather L.
    Australia Australia
    02/11/2022

    Great medium

    First time using rock wool: super easy and highly water absorbent! More porous than the IDOO pods

    AL
    Amy L.
    Australia Australia
    25/10/2022

    Quatantine

    Haven’t received yet I think it’s been held up in quarantine, they think it’s plants or seeds.

    FC
    Fiona C.
    Australia Australia