Grodan Gro-Cubes

Grodan Gro-Cubes


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Grodan Brand Product
$82.24 - $100.71

Lead time: Please call 888-815-9763 for regional availability and pricing


Grodan Product Documents

Grodan Grow Cubes MSDS

Grodan Gro-Cubes

Grow-Cubes are small loose 1/2 in cubes of stonewool. Advantages are better aeration, maximum drainage so that you can hardly ever overwater your plant, easy mixing with other loose media (such as expanded clay rocks or coconut fiber), lightweight and much cleaner than peat-based media.

The properties of Grow-Cubes™ make it like a 50/50 mix of absorbent to repellent stonewool.

Grow-Cubes stack on top of each other leaving air space in between them this promotes root growth. Each cube has four surfaces from which excess water can drain. This way, even if you water a lot, the Grow-Cubes will not get waterlogged.

Very easy to mix with any other potting mix. Special advantages are achieved by mixing Grow-Cubes in with clay pellets. The Grow-Cubes will help spread the water in the container as well as keeping a water buffer in between the watering. We have plenty of clay pellet options in our Clay Pebbles & Growstones category

What is Rockwool?

Grodan Stonewool (rockwool) is made from molten rock spun into cotton candy-like fibers and then compressed into cubes, blocks, or slabs. Where other rockwool brand manufacturers cut all sizes from one batch of wool, Grodan is unique by making different types of fibers. The purpose is to support the requirement of the plant in the different plant stages. Grodan has a tremendous capacity for absorbing nutrient solution while retaining plenty of oxygen for rapid plant growth. Grodan comes in graduated sizes. Seedlings started in cubes are easily transferred to blocks and then onto slabs, if desired. Seedlings or cuttings started in the Grodan cubes can also be transplanted into more traditional planters and growing mediums.

Comes in:

  • Case of 3 bags
  • Case of 6 bags
  • 1 Box (Loose box)

Grodan Gro-Cubes Videos

Product Q&A

Grodan Gro-Cubes Questions & Answers

Q: What is stone wool?
A: Stone wool is a mineral wool made of volcanic rock. Stone wool consists of 5% solid material in the form of stone fibres. The remaining 95% is made up of pores.

Q: How is stone wool made?
A: The basic materials for our stone wool are basalt and limestone. These are melted to form lava in an oven with a temperature of 1,500°C. The lava is then poured over a number of fast-rotating discs. Thanks to the centrifugal force, the drops fly off the discs and lengthen to form fibres. The process can be compared with candy floss being made at a fair. The fibres are then compressed to form a sturdy mass, from which the slabs and blocks are then cut.

Q: Why is stone wool suited for growing vegetables?
A: Our stone wool growing media are designed for Precision Growing in a greenhouse. Precision Growing focuses on ‘root zone management’, or in other words, steering of the root environment. Everything that happens in the stone wool substrate has an impact on the functioning of the root environment and therefore the development of the plant. So, we continually investigate how our products, tools and user advice can respond perfectly to changing circumstances, so that the plant is given the very best care, without wasting resources.

Tech Specs