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Rockwool Cubes

34 reviews
Number of Cubes
All deliveries are carbon neutral
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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
4.6 Based on 34 Reviews
5 ★
76% 
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4 ★
18% 
6
3 ★
3% 
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1 ★
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Filter Reviews:
    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
    30/09/2022

    It works every time.

    Fantastic, very happy!

    KB
    Kevin B.
    Australia
    22/09/2022

    Great after sales service

    Had a good experience although a few problems lately but after sales service sorted those issues out. Good company and stand by their products.

    CB
    Charles B.
    Australia Australia
    18/09/2022

    Best Rockwool cubes on the market

    I've tried cheaper options and they are nothing on these. Urban Plant Growers cubes are sturdy and don't fall apart once they become moist. They absorb moisture without being soaked. The cubes also have plenty of space to pop your seeds in. Highly recommend.

    DS
    Deborah S.
    Australia Australia
    11/09/2022

    Great and quick

    Very good delivery options and well packaged

    ND
    Noel D.
    Australia Australia
    08/09/2022

    Rockwool

    Great items . Fit for purpose with small hole in centre just right for planting . Suits their grow pots perfectly . Need to be a bit cheaper

    SH
    Simon H.
    Australia Australia
    07/09/2022

    Does the job

    Good fit, quick delivery, can’t get them anywhere else!

    CG
    Cherie G.
    Australia Australia
    29/08/2022

    Great products

    All the products we have purchased from Urban Plant Growers Work A Treat I have lots of herbs and a good hobby to boot. Thanks.

    GK
    Gregory K.
    Australia Australia
    28/08/2022

    Rockwool Cubes

    great - grow up to 12 lettuces at a time and the taste is so fresh

    LG
    Louise G.
    Australia Australia
    18/08/2022

    Rockwhool

    It does the job, parcel came really fast. I recommend

    ME
    Maeve E.
    Australia Australia