Grodan Rockwool Propagation Cube for Effortless Seed Starting and Cuttings

Designed for both raising seeds and growing plant cuttings, the Grodan Rockwool Propagation Cube with Hole provides an optimal growing environment for seedlings and young plants. These high-quality 75mm x 75mm x 60mm cubes offer a versatile and effective growth medium for various plant types, ensuring optimal root development and successful propagation.

Features and Benefits

  • Dual-sided design: The cube has one flat side for raising small seeds and another side with a hole for inserting 40mm and 30mm rockwool blocks, making it suitable for cuttings and seedlings.
  • Optimal root growth: Rockwool offers superior water retention, ensuring plant roots receive consistent moisture, encouraging healthy root development.
  • Compatible with 77 cube trays: Perfectly fits in 77 cube trays, making it easy to keep your seedlings organized.
  • Durable and reusable: The Grodan Rockwool Cubes are sturdy and can be reused multiple times, offering excellent value for money.
  • Aids in successful propagation: The holes in the cubes create the ideal space for roots to anchor and grow, increasing the likelihood of successful propagation.

How to Use

  1. Soak the Grodan Rockwool Cubes in water with a pH of 5.5 for around 30 minutes to ensure proper moisture absorption.
  2. For seeds, place them on the flat side of the cube, gently pressing them into the surface. For cuttings or seedlings, insert the smaller rockwool blocks into the holes on the other side of the cube.
  3. Place the cubes in a 77 cube tray or another suitable tray for support and organization.
  4. Provide adequate water and nutrients to the plants as needed, ensuring consistent moisture for optimal growth.

Aqua Gardening Suggests These are Best For

Grodan Rockwool Propagation Cubes are best suited for gardeners and farmers looking for a versatile growth medium to support their seed starting and plant cutting needs. Ideal for various plant types, these cubes are particularly useful for hydroponic growing systems and other indoor propagation setups.

Notes from Aqua Gardening

  • Always wear gloves and a mask when handling rockwool to avoid potential health risks such as skin, eye, and respiratory irritation.
  • Make sure to soak the cubes with the correct pH level; improper pH levels can hurt seedling growth.
  • Rockwool is not biodegradable, so it should be disposed of responsibly to minimise environmental impact.

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


What is the purpose of Grodan Rockwool Propagation Cube with Hole?

The Grodan Rockwool Propagation Cube with Hole is designed for raising seeds or growing cuttings. It can be used with smaller rockwool blocks or trays to promote healthy root growth and improve the success rate of propagation.

Can the Rockwool cubes be used for both seeds and cuttings?

Yes, one side of the cube has a hole to accommodate smaller 40mm and 30mm rockwool blocks, perfect for cuttings and seedlings. The other side is flat, allowing you to place small seeds directly onto the surface.

Is it necessary to use any nutrients or water with the Rockwool cubes?

Yes, providing the roots with a small amount of nutrient and water helps in the growth and development of the plants. It promotes healthier and stronger roots while using the Rockwool cubes.

How do I properly use the Grodan Rockwool Propagation Cube with Hole?

To use the Rockwool cube, simply place the smaller rockwool block into the hole for cuttings and seedlings, or place seeds onto the flat side for direct seeding. The roots will grow into the new block as they receive nutrients and water.

Are these Rockwool cubes reusable?

While it is possible to reuse the Rockwool cubes, it can be difficult to clean and sterilize them adequately without damaging their structure. It's generally recommended to use new cubes for each propagation to ensure optimal growth conditions.

Can I use the Grodan Rockwool Propagation Cube with any type of plant?

Yes, the Grodan Rockwool cubes are suitable for a wide range of plants. Whether you're growing fruit, vegetables, or decorative plants, these rockwool cubes can help improve the success rate of your propagation efforts.

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(SKU: 125766)

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