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.
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
Dimensions of each cube: 4cm (h) x 2cm (w) x 2cm (l)
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!
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!
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.
Helps my hydroponic plants grow well
So much better than soil planting - have been using with my big family farm since January & these are great
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
The rock wool cubes are easy to use and affordable. Glad I can reorder on the website when I need more!
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.
Hey Sam, That's great! Thanks for the positive feedback and review. Charlotte
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
Hey Annette, That's great to hear! So glad our products are working well for you. Thanks for your kind review, Charlotte
All in all, the rockwool cubes work quite well. Sometimes though, they flood and drown the seeds when being set up.
Good product easy to use
Good, work as advertised.
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
Always quick delivery xx