Grodan Granular 25kg Bag – Premium Loose Stone Wool Growing Medium
Grodan Granular 25kg Bag is a premium loose stone wool growing medium designed for professional growers, commercial horticulture, and home gardeners seeking exceptional root development and consistent plant performance. Manufactured from high-quality basalt rock and limestone, the material is heated to extremely high temperatures before being spun into fine hydrophilic fibres, creating a clean, sterile, and highly effective substrate for hydroponic and soilless cultivation.
This advanced growing medium offers an ideal balance of moisture retention and oxygen availability, allowing plants to access water and nutrients while ensuring roots receive the oxygen they require for vigorous growth. The open fibre structure creates a highly stable root environment that encourages rapid root establishment, efficient nutrient uptake, and healthy plant development throughout the growing cycle.
One of the biggest advantages of Grodan Granular is its exceptional water-holding capacity combined with rapid re-wetting properties. Even after drying, the fibres quickly absorb water, helping maintain consistent moisture levels around the root zone. This makes it particularly suitable for water-demanding crops and growers looking to achieve precise irrigation control in both recirculating and run-to-waste hydroponic systems.
Being completely inert and pH neutral, Grodan Granular gives growers complete control over nutrient management without introducing unwanted salts or organic contaminants. It is also sterile and free from weeds, pests, and soil-borne diseases, reducing the risk of root problems and providing a clean environment for healthy plant growth.
The loose granulate format offers excellent versatility. It can be used on its own in pots, containers, raised beds, propagation trays, and hanging baskets, or blended with other growing media such as perlite, expanded clay, coco coir, or peat-based mixes to improve moisture retention, aeration, and overall substrate structure.
Each 25kg bag expands to approximately 170 litres of usable growing media, making it a highly economical solution for larger gardens and commercial growing operations. Whether producing vegetables, herbs, ornamentals, or flowering plants, Grodan Granular provides the consistency, reliability, and performance trusted by growers worldwide.
Key Features
- Premium loose stone wool (rockwool) growing medium
- Expands to approximately 170 litres of usable substrate
- Exceptional water-holding capacity
- Excellent aeration for healthy root development
- Rapid re-wetting properties
- Sterile, clean and pathogen free
- Inert and pH neutral
- Suitable for hydroponic and soilless growing
- Ideal for recirculating and run-to-waste systems
- Can be used alone or blended with coco, perlite or clay pebbles
- Lightweight and easy to handle
- Suitable for vegetables, herbs, flowers and ornamental plants
