Grodan Rockwool Cubes: Perfect for Seeds and Cuttings Growth

Effectively raise seeds and grow cuttings with the Grodan Rockwool Cubes, designed to cater to both small seeds and larger cuttings in a 150mm x 150mm x 150mm size. With a specially indented side for larger seeds or cuttings, and a flat side for smaller seeds, these cubes provide optimal conditions for healthy plant development.

Features and Benefits

  • Versatile Application: Ideal for growing seeds and cuttings, these rockwool cubes support a wide range of plant types.
  • Optimal Size: Measuring 150mm x 150mm x 150mm, the cubes are adequately sized for both compact indoor and larger outdoor use.
  • Indented and Flat Sides: The indented side accommodates larger cuttings and seeds, while the flat side is perfect for smaller seeds.
  • Superior Water Retention: Rockwool retains water effectively, ensuring consistent moisture and encouraging healthy root development.
  • Air Porosity: The rockwool material provides excellent air porosity, promoting robust plant growth and development.

How to Use

  1. Choose the appropriate side of the Grodan Rockwool Cube for your seeds or cuttings, flat side for small seeds or the indented side for large seeds or cuttings.
  2. Before planting, soak the rockwool cube for at least one hour in a water and nutrient solution with a pH level of 5.5-6.0.
  3. Drain any excess water from the pre-soaked cube.
  4. Place your seeds or cuttings into the chosen side of the cube, ensuring a firm yet gentle fit. Avoid damaging the plant material during insertion.
  5. Once the seeds or cuttings have been securely placed, maintain ideal growing conditions by monitoring and adjusting the nutrient solution and pH level as needed.

Aqua Gardening Suggests These are Best For

Grodan Rockwool Cubes are an excellent choice for gardeners, growers, and hobbyists who are looking to support strong and healthy plant growth for both seeds and cuttings. These cubes are particularly suitable for hydroponic systems but can also be utilised in traditional soil-based environments, making them a versatile addition to any garden.

Click here to read our handy guide on raising seeds with rockwool.


What is the purpose of using Grodan Rockwool Cubes?

Grodan Rockwool Cubes are designed to provide an optimal growing medium for raising seeds and growing cuttings in hydroponic systems or container gardening. Their structure ensures excellent water retention and aeration, promoting strong and healthy root development.

How do I use Grodan Rockwool Cubes for planting seeds and cuttings?

To plant seeds, use the flat side of the cube and place the seed on the surface, gently pressing it down until it's slightly covered. For cuttings, use the side with a small indent, inserting the stem into the indentation and ensuring it reaches the bottom. Keep the cube moist during the germination and rooting process.

Are Grodan Rockwool Cubes suitable for all types of plants?

Yes, these cubes are versatile and suitable for growing a wide variety of plant species, including vegetables, herbs, and ornamentals. The cubes provide an ideal environment for seed germination and rooting of cuttings, regardless of the plant type.

How do I water the Grodan Rockwool Cubes?

It's essential to maintain proper moisture levels in the cube to support plant growth. You can water the cube by gently pouring nutrient-rich water over the surface or by placing the cube in a container with enough water to cover half its height. Make sure to remove excess water when using a container for watering.

Can I reuse Grodan Rockwool Cubes after my plant has outgrown them?

While it is possible to reuse the cubes, it's not generally recommended due to the risk of spreading diseases or pests. Proper sterilization is required to ensure a healthy growing environment for your new plants.

Are Grodan Rockwool Cubes eco-friendly?

Yes, Grodan Rockwool Cubes are made from sustainable and recyclable materials. Rockwool is an inert, non-degradable material, and Grodan is committed to responsible manufacturing processes that prioritize environmental sustainability.

How do I transplant my plants from Grodan Rockwool Cubes to another growing medium?

When your plant has outgrown the cube, carefully remove it by gently sliding a clean utensil around the cube's edges to release the roots. Then, place the plant, along with the cube, into the new growing medium, ensuring that the roots are adequately covered and supported.

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