01

Rooted in science

A uniform growing medium – thanks to a perfectly controlled manufacturing process. This makes the quality and properties of Grodan stone wool and this leads to precise plant behaviour thanks to an excellent root zone management.

02

Efficient

Water saving properties – we are all aware that fresh water is a precious resource. Stone wool retains water and the water including nutrient solution that it holds is in its entirety available to the plants.

03

Soilless

A bountiful natural resource – Every year the earth produces 38,000 times more basalt than we use to produce stone wool. Respect for biodiversity – At a time when biodiversity is under threat, we are proud to be contributing to the safeguarding of our ecosystems.

04

Reliable

Food safety compliant – food safety has never been this crucial in today’s world.

05

Recyclable

100% recyclable - after the growing cycle is complete, stone wool is recyclable in more and more places around the world.

06

Data driven & Steerable

Maximise your crop’s potential with data-driven cultivation. Grodan stone wool growing media are paired with sensors, a software platform and crop-specific advice, enabling precision growing. The GroSens sensors enable 24/7 real-time insight into the WC, EC and temperature of the stone wool growing media. Connect our e-Gro platform with the GroSens sensors to support your knowledge, experience and growing strategy with real-time insights and smart recommendations based on the root zone, climate, crop and harvest data.There’s a reason stone wool is the preferred choice as growing media, thanks to its compatibility with both soil-based and hydroponic cultivation systems for irrigation, lighting, automated nutrient delivery and other top precision growing techniques

07

Flexible & Lightweight

A key value for Grodan is our delivery security and reliability. We can produce and deliver our high quality stone wool products in large and small quantities year-round, matching the wishes and needs of our customers. Stone wool is 1/10 of the weight of a bag of potting soil

Stone and the cultivation of plants go perfectly hand in hand. Transforming and utilising an abundant natural resource to benefit humanity is something we find rather magical and exciting. With Grodan stone wool growing media growers cultivate fresh produce that contribute to the health of consumers around the world. What is it that makes stone wool so special?

Seven Strengths/7 of Stone, Logo, Campaign, 7SS

In our brochure ‘7 strengths of stone wool growing media’ we explain why stone wool is perfectly suited for growing healthy and fresh food efficiently and sustainably. And with that the growing media to feed a growing population. Each strength is explained and enriched with links to other publications. In that way you can read much more on topics related to this story.

In this journey we take you by the hand and enlighten you on 7 strengths of stone wool growing. Which are these?

  • A uniform growing medium – thanks to a perfectly controlled manufacturing process. This makes the quality and properties of Grodan stone wool and this leads to precise plant behaviour thanks to an excellent root zone management
  • Water saving properties – we are all aware that water is a precious source. Stone wool is an inert medium and the water including nutrient solution that it holds is in its entirety available to the plants.
  • Respect for biodiversity – At a time when biodiversity is under threat, we are proud to be contributing to the safeguarding of our ecosystems
  • A bountiful natural resource – Every year the earth produces 38,000 times more basalt than ROCKWOOL uses to produce stone
  • Transparency and proximity – Grodan factories operate in accordance with the highly stringent European regulations for working conditions and product quality
  • Food safety compliant – food safety has never been this crucial in today’s world. Renowned institutes ensure that our products do not pose any threats to either humans

We believe we inspired you to read further and to discover much more on the seven strengths of our stone wool growing media. In case you have any questions, do not hesitate to contact us.

By significantly increasing yields per square meter, crops grown on stone wool growing media are a means of supporting the planet’s growing demand for food by using a smaller
surface area.

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20240214 RW-GR PHO 1301
By Andrew Lee
Water Management
Sustainable Growing

Drain is not the goal in precision irrigation

Besides helping growers to achieve their sustainability goals, efficient water management plays a crucial role in maintaining plant health. Realising or steering towards a certain drain volume or drain percentage per day should not be your goal. Instead, the goal should be optimising your irrigation strategy to provide your crop with precisely the amount of water and nutrients it needs. This will ensure the development of a strong and healthy root system, leading to consistently good plant growth, fruit quality and a higher total production. Grodan’s Andrew Lee explains how.

20181022 RW-GR PHO 7
Sustainable Growing

Rooted in Science: Grodan's research into pepper wilting

Since 2022, a limited number of high-tech greenhouse pepper growers worldwide have faced a rapid and severe form of wilting that posed a threat to crop production. This has left growers searching for answers. In response, Grodan funded rigorous, independent research, collaborating with a wide range of industry partners to analyse all potential contributing factors. Findings to date currently point to a specific isolate of the pathogenic fungus Fusarium as the cause. Today in the Netherlands and Belgium the isolate it is referred to as Fusarium oxysporum radicis capsici (FORC). In Canada it is referred to as Fusarium Oxysporum Species Complex (FOSC). It is highly pathogenic and specific to peppers. Initial scientific reports also show that wilting caused by the Fusarium isolate can occur in both stone wool and organic substrates.

20250626 RW-GREA PHO 1677
Sustainable Growing

Circular solutions in horticulture. How sustainable production and efficient operations work hand in hand

Brussels, Belgium, June 24, 2025 – As part of the EU Green Week 2025, Grodan organised a workshop on ‘Circular solutions in horticulture. How sustainable production and efficient operations work hand in hand’. The event explored how circular approaches can support more efficient and sustainable horticultural practices across Europe.

20241209 RW-GR PHO 1566
By Lise Maibom
Water Management
Sustainable Growing

Trials underline the importance of an optimised irrigation strategy for lettuce

In comparison to other high-tech crops grown commercially, much less research has been done into cultivating lettuce on stone wool. At Grodan, we are keen to help increase the availability of science-based information by conducting lettuce trials with respected partners.

20250618-RW-GREA PHO 1670
Sustainable Growing

Start from Zero – Redefining Greenhouse Cultivation with Bioprotection

“Change starts from zero.” This phrase is increasingly echoed among European growers who want to eliminate or significantly reduce chemical plant protection products in greenhouse production. The “zero pesticide” trend has long dominated in France and, over the past three seasons, has been rapidly gaining momentum in the Netherlands—a country setting the pace for protected horticulture worldwide.

20240910 RW-GR PHO 1535
Sustainable Growing

Investing in Reliability: How Local Production Supports Canadian Growers

In an industry that deals with live plants, where timing can make or break a crop, access to reliable, high quality growing media is critical. That’s why Grodan made the decision in 2012 to invest in local production, opening a stone wool manufacturing facility in Milton, Ontario.

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