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Rockwool Cubes

19 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 packs or 96 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
4.5 Based on 19 Reviews
5 ★
74% 
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4 ★
16% 
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3 ★
5% 
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1 ★
5% 
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Filter Reviews:
    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
    03/07/2022

    works well

    Helps my hydroponic plants grow well

    NA
    Nancy A.
    Australia
    24/06/2022

    Nifty little soil-free option for indoor growing!

    So much better than soil planting - have been using with my big family farm since January & these are great

    JA
    Jen A.
    Australia Australia
    19/06/2022

    3 months and nothing

    I have had pretty bad returns so far. I think the electricity has cost way more than purchasing fresh herbs from Woolies. So far I have one plant

    MG
    Marcus G.
    Australia Australia
    19/06/2022

    Easy to use and affordable

    The rock wool cubes are easy to use and affordable. Glad I can reorder on the website when I need more!

    MF
    Maree F.
    Australia Australia
    23/05/2022

    Handy!

    These cubes are a great medium for growing seeds in smart gardens. I have tested various mediums for growing seeds in hydroponic gardens and these work the best by far.

    SG
    Sam G.
    Australia Australia
    10/06/2022

    Urban Plant Growers

    Hey Sam, That's great! Thanks for the positive feedback and review. Charlotte

    07/04/2022

    Great product

    I received a smart garden as a Xmas present in 2020. Every few months I buy new rock wool cubes and seedlings to replant my herb garden. It’s a great product

    AM
    Annette M.
    Australia Australia
    10/06/2022

    Urban Plant Growers

    Hey Annette, That's great to hear! So glad our products are working well for you. Thanks for your kind review, Charlotte

    21/02/2022

    Usually works well!

    All in all, the rockwool cubes work quite well. Sometimes though, they flood and drown the seeds when being set up.

    TL
    Tremayne L.
    Australia Australia
    20/02/2022

    Good product

    Good product easy to use

    TT
    Takai T.
    Australia Australia
    20/02/2022

    Rockwool

    Good, work as advertised.

    DB
    DAVID B.
    Australia Australia
    09/02/2022

    Great product

    I received a smart garden as a Xmas present in 2020. I regularly buy rock wood cubes when it’s time to replant more seedlings

    AM
    Annette M.
    Australia Australia
    06/12/2021

    Great way to grow

    Always quick delivery xx

    CW
    Chrissie W.
    Australia Australia