Excellent water retention
Rockwool holds a lot of water, ideal for a constant moisture supply.
Substrate
Pros and cons of rockwool
Rockwool is a widely used growing substrate in professional horticulture. What exactly are the advantages, and what should you keep in mind?
Paper Plug TraysEllepot FP 12+
The short answer
Rockwool gives precise control over water, air and nutrition and is clean and uniform. In return it requires buffering, accurate watering and responsible disposal.
Advantages of rockwool
Good air permeability
The open structure supplies oxygen to the roots.
pH-neutral
A stable pH value that is easy to buffer.
Clean
No weeds, diseases or pests, so a clean start.
Consistent quality
Uniform properties for predictable growing results.
Fast root growth
The structure stimulates healthy, fast root development.
Disadvantages of rockwool
Higher purchase cost
The investment is higher than for some alternatives.
Buffering required
Rockwool must be buffered to the correct pH before use.
Accurate watering
Incorrect watering quickly upsets the water balance.
Knowledge required
Optimal use requires experience with EC and pH.
Energy-intensive production
Production requires high temperatures.
Disposal after use
Responsible disposal requires recycling or reuse.
Conclusion
For professional growers the advantages carry weight: control, consistent quality and proven results make rockwool a common choice for propagation. The disadvantages are mainly the learning curve and the purchase cost.
The plugs have an Ellepot FP 12+ paper sleeve. Read about the materials used in paper pot rockwool plugs and the difference between the core and the sleeve.
From material to propagation plug
For sowing and cuttings, explore our rockwool plugs in 84- or 104-cell trays. Compare plug sizes and box contents to choose the right version.
Getting started with the trays? Read our guide to using rockwool propagation plugs for practical information on propagation.
Knowledge base
Further reading
Paper Plug Trays
Rockwool plugs with a paper sleeve
Paper Plug Tray 84 and 104: rockwool plugs with an Ellepot FP 12+ sleeve, supplied by the complete box.