Rockwool/stonewool is a man-made growing medium made from spun basalt rock and is commonly used in hydroponic cannabis cultivation.
Also called / Category:
Stone wool, mineral wool / Environment, Media & Nutrition
Key takeaways:
- Popular in hydroponic systems for cannabis cultivation.
- Has excellent water retention and aeration properties.
- Inert medium, meaning it doesn’t alter nutrient levels.
- Environmentally produced but not biodegradable.
What it is / How it shows up:
Rockwool/stonewool is often seen on menus of hydroponic supply stores and in product descriptions for cannabis cultivation kits. It is an inert growing medium, meaning it doesn’t affect the pH or nutrient levels of the system. This makes it ideal for precise nutrient management in hydroponic systems. The fibres are formed by spinning molten basalt rock into fine strands, similar to cotton candy, and then compressed into cubes, slabs, or blocks. Its high water retention capacity and good aeration properties support healthy root development in cannabis plants.
How it’s measured or identified:
- Measured by volume, typically in cubic inches or centimetres.
- Identified by its fibrous texture and yellowish colour.
Use in context:
- Growers frequently use rockwool slabs in hydroponic systems.
- Rockwool cubes are ideal for starting cannabis seedlings.
- Stonewool allows for easy transplanting due to its structure.
Safety & compliance in Canada:
- Must be disposed of properly due to non-biodegradable nature.
- Ensure proper handling to avoid inhalation of fibres.
Related terms / See also:
Aeroponics, Beneficial microbes, Auto-flower, Apical meristem, Air exchange
FAQs:
Is rockwool biodegradable? No, rockwool is not biodegradable and should be disposed of properly to avoid environmental impact.
Why is rockwool used in offset-4 transition-colors hover:underline" title="Learn more about Hydroponics">hydroponics? Rockwool is used in hydroponics for its excellent water retention, aeration properties, and inert nature, which allows for precise nutrient management.
Sources:
- Health Canada
- PubChem
- Hydroponics Association of Canada