Together with SoilSteam, Advanced Invasives and Morgan Sindall Infrastructure, Gavin Griffiths Group has been shortlisted in the category “Best Research or Application in the Advancement of Science, Technology or Digital Innovation in the Brownfield Sector.”

The nominated project – “De-risking and Deploying a UK-First Soil Steaming Innovation for Invasive-Impacted Brownfield Soils” – is based on the introduction, scientific validation and commercial deployment of SoilSteam’s SoilSaver technology in the UK.

Recognition in a highly competitive market

For SoilSteam, this nomination means a great deal.

The UK has one of Europe’s most developed and competitive markets for brownfield remediation and soil reuse, with a strong focus on reducing landfill, lowering carbon emissions and keeping excavated soil as a valuable resource.

Introducing an entirely new remediation method into such a mature market requires both commitment and courage.

Gavin Griffiths Group made that commitment when they decided to introduce SoilSaver to the UK. They invested in the technology, operator training and independent scientific validation before bringing it into commercial operation.

From invasive soil to reusable resource

One of the challenges facing UK construction projects is soil impacted by invasive plants such as Japanese knotweed. Traditional approaches can involve years of herbicide treatment or excavation and disposal of the affected soil.

SoilSaver provides another option.

The mobile system treats excavated soil using controlled steam heat, destroying viable plant material without chemical additives and enabling the soil to be recovered and reused rather than disposed of.

Before commercial deployment, Gavin Griffiths Group commissioned an independent study with Advanced Invasives. The results showed no emergent growth from the steam-treated Japanese knotweed rhizomes, while untreated control samples produced extensive new growth.

The technology was subsequently deployed with Morgan Sindall Infrastructure at Dŵr Cymru Welsh Water’s Trebanos site in South Wales – the first full-scale UK application of mobile soil steaming for invasive-species remediation within a regulated construction environment.

Approximately 1,780 m³ of invasive-impacted soil was treated on site and made available for reuse within the project.

Proud of our customer

Technology alone does not change an industry. Customers willing to adopt it do.

Gavin Griffiths Group has been willing to challenge established methods, invest in a new technology and demonstrate that soil affected by invasive plants does not necessarily have to become waste.

Seeing this work recognised by the UK brownfield industry through such a prestigious nomination makes us extremely proud.

It is also an important milestone for SoilSteam. In one of Europe’s most demanding markets for soil remediation and reuse, SoilSaver is demonstrating a simple but important principle:

Save the soil. Treat the problem. Reuse the resource.

Congratulations to Gavin Griffiths Group, Advanced Invasives and Morgan Sindall Infrastructure on the nomination. We are proud to be part of this strong team.

Read more about the nomination here

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In new trials conducted in 2026, used substrate was collected together with plant residues from the previous crop, shredded and treated using SoilSteam technology. It was then reused as 100% of the growing medium in a new crop of the strawberry variety Sonsation.

The results were very encouraging:

• Fresh substrate produced a yield of 6.14 kg/m².
• Steam-treated substrate produced between 6.31 and 6.39 kg/m².
• Untreated substrate containing plant residues produced only 5.05 kg/m².
• No significant differences were recorded in fruit quality, firmness, sugar content or shelf life.

The trial therefore confirms the results from 2025: steam treatment restores the substrate’s growing potential, even when the substrate is reused in full.

Lower energy consumption

This year’s trials also demonstrated that the same strong results can be achieved at lower treatment temperatures. At the same time, recorded energy consumption during the trial was reduced from 160 to 90 kWh—a reduction of nearly 44%.

This makes the solution even more attractive for commercial strawberry production.

By using the substrate for two production cycles, growers could, in principle, halve the cost of purchasing fresh substrate before treatment and logistics costs are taken into account. Our calculations also indicate that the carbon footprint associated with the growing medium could be reduced by up to 90%.

The results demonstrate that used substrate does not have to be a single-use resource. With the right treatment, it can be reused with the same yield and quality, but with lower costs and a substantially smaller carbon footprint.

Read the full trial report:

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This is far more than the sale of a single machine. It marks SoilSteam’s entry into the North American market – a region facing significant environmental challenges and a growing demand for sustainable solutions for the treatment and recovery of biologically contaminated soil.

A Strategic Partner with a Clear Vision

Headlands Environmental is a leading environmental contractor on Canada’s West Coast and has made significant investments in technologies that enable soil to be recovered rather than disposed of.

The company has recently commissioned a state-of-the-art soil washing plant for the treatment of chemically contaminated soil. By investing in the SoilSaver20, Headlands can now also treat soil contaminated by invasive plant species, plant pathogens and other biological contaminants.

Even more importantly, the company will be able to process soil containing both chemical and biological contamination—a combination that has traditionally resulted in valuable soil being sent to landfill.

By combining soil washing with SoilSteam’s thermal treatment technology, Headlands will be able to offer one of the most comprehensive soil recovery solutions available in the Canadian market.

Japanese Knotweed – A Growing Challenge

One of the main reasons Headlands Environmental chose to invest in the SoilSaver20 is the increasing challenge posed by Japanese knotweed.

Recognised as one of the world’s most invasive plant species, Japanese knotweed has become a major issue throughout both Europe and North America. In Canada, it creates significant challenges for infrastructure projects, construction sites and urban development.

Whenever soil contains rhizomes or plant fragments from Japanese knotweed, it is often classified as biologically contaminated. In many cases, the only available option has been to transport this valuable soil to landfill because no practical treatment solution has been available.

With the SoilSaver20, Headlands will be able to thermally treat contaminated soil, eliminate biological contaminants without the use of chemicals, and return the treated soil to productive use instead of disposing of it.

A Small Step – But an Important One

Every year, millions of tonnes of soil are sent to landfill simply because they contain seeds, roots or other biological contaminants. At the same time, equivalent quantities of new soil must be excavated to replace the discarded material.

We believe this is not a sustainable way to manage one of our most valuable natural resources.

Healthy soil is a limited resource. If it can be safely treated and reused, it should be.

The delivery of the SoilSaver20 to Headlands Environmental will not solve this global challenge on its own. However, it represents another important step towards a more circular approach to soil management.

Every project that chooses soil recovery instead of landfill helps reduce the extraction of virgin materials, lowers landfill volumes and contributes to a more sustainable construction industry.

SoilSteam’s First Machine in North America

For SoilSteam, this delivery represents a major milestone.

Over the past few years, we have successfully established our technology in Norway, Sweden and the United Kingdom. With this first installation in Canada, we are now entering the North American market.

Canada faces many of the same challenges as Europe. Invasive species continue to spread, environmental regulations are becoming increasingly stringent, and both public authorities and private contractors are looking for solutions that reduce landfill while enabling valuable soil resources to be recovered.

We believe North America represents a significant long-term market for SoilSteam and look forward to developing our partnership with Headlands Environmental.

This Is Just the Beginning

From the very beginning, SoilSteam’s vision has been to transform biologically contaminated soil from a waste problem into a valuable resource.

The delivery to Canada demonstrates that this vision is gaining momentum beyond Europe.

We would like to thank Headlands Environmental for their trust and partnership, and we look forward to working together for many years to come.

The first SoilSaver20 is now on its way to North America. We hope it will be the first of many.

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This marks a significant milestone for both SoilSteam and the development of sustainable soil management practices in the UK.

From landfill to revitalized soil

The challenge of invasive non-native species is significant – in Norway, the UK, and internationally. Traditionally, contaminated soil has been transported to a landfill – a resource-intensive and unsustainable approach that also removes valuable soil resources from circulation.

With SoilSteam’s technology, soil can instead be treated and revitalized on site. The machines use steam to neutralize seeds, roots, and unwanted organisms, allowing the soil to be safely reused. This delivers both economic and environmental benefits while significantly reducing the need for transport and disposal.

A forward-thinking partner in the UK

For SoilSteam, the agreement with Gavin Griffiths Ltd represents a major step into a new market. The company is a progressive and future-oriented player in waste management, recycling, and environmental services, and shares SoilSteam’s ambition to develop solutions that combine sustainability, innovation, and profitability.

“We are very pleased to have secured an agreement with a partner that dares to take the lead in the UK market. Gavin Griffiths has demonstrated both the will and the ability to think differently, and we are proud to have them on board,” says Ken Roar Riis, CEO of SoilSteam.

From Gavin Griffiths Ltd, the enthusiasm is equally clear:

“We are proud to be the first company in the UK to offer this technology. It gives us a unique position in the market and opens new opportunities for sustainable services that meet both regulatory requirements and customer needs,” says Chris Taylor-King, Managing Director of Gavin Griffiths Ltd.

A green shift in soil management

This agreement is more than a commercial breakthrough – it points towards a new standard for soil management in the UK. With SoilSteam now in place at Gavin Griffiths Ltd, it is possible to tackle invasive species sustainably, while also contributing to a circular economy that safeguards soil resources for the future.

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In recent years, numerous recalls of lettuce, leafy greens, sprouts and microgreens have been linked to these pathogens. In Canada, organic microgreens were recalled after E. coli was detected. In Ireland, spinach and mixed leaf products were withdrawn from the market due to Listeria monocytogenes. In the United Kingdom, a major E. coli outbreak linked to lettuce resulted in widespread product recalls, while in the United States a Listeria outbreak associated with packaged salads led to multiple fatalities.

You can read more about some of these incidents here:

• Food Safety News – Microgreens recalled in Canada because of E. coli: https://www.foodsafetynews.com/2026/05/microgreens-being-recalled-in-canada-because-of-e-coli/
• Food Safety Authority of Ireland – Recall of various branded spinach and mixed leaves: https://www.fsai.ie/news-and-alerts/food-alerts/recall-of-various-branded-spinach-and-mixed-leaves
• The Guardian – UK E. coli outbreak linked to lettuce: https://www.theguardian.com/world/2024/jun/20/number-hospitalised-by-e-coli-reaches-86-as-uk-lettuce-outbreak-grows
• U.S. Food and Drug Administration – Listeria outbreak linked to Dole packaged salads: https://www.fda.gov/food/outbreaks-foodborne-illness/outbreak-investigation-listeria-monocytogenes-dole-packaged-salad-december-2021

Clean Growing Media Is One of the Most Important Barriers Against Contamination

Foodborne outbreaks rarely have a single cause. Seeds, irrigation water, equipment, handling and the production environment can all contribute to contamination. However, one factor is often overlooked: the growing substrate itself.

Contaminated substrate can act as a reservoir for harmful microorganisms. In the production of lettuce, herbs and microgreens—where crops are harvested within weeks and consumed fresh—it is essential to minimise biological risks before the seeds are even sown.

For growers committed to the highest standards of food safety, good hygiene alone is not enough. It starts with using a growing medium that is demonstrably free from harmful biological contaminants.

Why Vertical Farms Around the World Are Contacting SoilSteam

SoilSteam originally developed its steam technology to enable the safe reuse of biologically contaminated soil and horticultural substrates. Through years of research, including collaborations with leading research institutions, the technology has been shown to effectively eliminate a wide range of plant pathogens and microorganisms while maintaining crop performance.

Today, we are seeing a new trend.

An increasing number of vertical farms, lettuce growers and microgreens producers are contacting SoilSteam—not because they want to recycle their substrate, but because they want to ensure that new substrate is biologically clean before production begins.

“Our original goal was to develop technology that allows contaminated soil and growing media to be safely reused. Today, we are seeing growing interest from producers who want our help to ensure that even brand-new substrate is biologically clean before it enters production. That is incredibly inspiring for us. In our view, the only reliable way to guarantee a biologically clean growing medium is to treat it using equipment that independent third-party research has demonstrated can sterilise the substrate,” says Hans Kristian Westrum, Sales Director at SoilSteam.

An Investment in Food Safety

Product recalls are expensive. Beyond the immediate financial losses, they can severely damage customer confidence, retailer relationships and brand reputation. For producers of lettuce, herbs and microgreens, preventing contamination is almost always far less costly than dealing with the consequences of a recall.

At SoilSteam, we believe the future of greenhouse and vertical farming should be built on three fundamental principles:

• A biologically clean growing medium.
• Safe and sustainable substrate reuse.
• Lower carbon emissions without compromising food safety.

As food safety standards continue to tighten around the world, we believe clean substrate will become a new benchmark for professional horticulture. We are proud that SoilSteam’s technology can help growers produce safer food while contributing to a more sustainable and circular agricultural industry.

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When soil is treated as waste, value is lost

Today, large volumes of soil end up in landfills due to biological contamination such as seeds, roots, and invasive species. This happens despite soil being a limited and essential resource.

Vestnes Renovasjon has long questioned this practice:

“We have been frustrated seeing reusable soil being sent to landfill. When solutions exist to treat and make it safe and marketable, we need to start thinking of soil as a resource – not waste,” says CEO Ole Andreas Holm.

From problem to premium product

With the SoilSaver20, soil that would previously be discarded can now be treated and reused. The result is 100% weed-free soil, fully documented and ready to be reintroduced into the market.

For Vestnes, this opens up new opportunities:

• Development of tailored soil blends
• Improved resource utilization
• New revenue streams

This is not just waste handling – it is value creation.

A necessary shift in the industry

While the waste industry has made significant progress in recycling materials like plastic, glass, and metal, soil has largely remained the “last fraction” – often overlooked.

This is exactly what SoilSteam aims to change:

“It’s time to move away from outdated thinking where biologically contaminated soil is automatically treated as waste,” says Hans Kristian Westrum, Head of Sales and Marketing at SoilSteam.

Vestnes Renovasjon is now taking a clear leadership role in driving this transition.

More than an investment – the start of a collaboration

The investment in SoilSaver20 also marks the beginning of a broader collaboration between the two companies. Together, they will:

• Optimize treatment processes
• Document climate and environmental benefits
• Contribute to the development of future standards

This work will be key to advancing the entire industry.

Accelerating change in Norway

While other countries have been early adopters, SoilSteam believes this investment could mark a turning point in Norway:

“When the technology exists and is economically viable, it simply doesn’t make sense to continue landfilling valuable soil resources,” says CEO Ken Roar Riis.

A strong signal to the market

Vestnes Renovasjon’s investment demonstrates that:

• The technology is proven
• The market is ready
• The transition to circular soil management has begun

This is about more than one machine – it’s about changing how we think about soil.

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However, soil is often contaminated with chemicals, invasive plant species, seeds, roots, and plant pathogens. If this soil is reused without proper treatment, it can unintentionally spread invasive species to new areas.

Two technologies are sometimes mentioned when treating contaminated soil: soil washing and SoilSteaming.

While both methods process soil, they serve very different purposes — and only one of them is effective when dealing with biological contamination such as invasive plant seeds and plant pests.

What is Soil Washing?

Soil washing is a remediation technology designed to remove chemical contamination from soil.

It is commonly used to treat soil polluted with:

• heavy metals
• petroleum hydrocarbons
• industrial pollutants
• contaminated fine particles

The process separates soil into different particle sizes and washes the soil with water and sometimes chemical additives. Many contaminants bind to the smallest soil particles (silt and clay), which are separated from the larger mineral fractions.

Typical soil washing steps include:

1. Excavation of contaminated soil
2. Screening and separation of soil fractions
3. Washing with water or chemical solutions
4. Separation of contaminated fines from reusable soil

The cleaned mineral fraction can then be reused in construction projects.

Why Soil Washing Does Not Work for Invasive Species

While soil washing can remove chemical contaminants, it is not designed to eliminate living organisms.

When soil contains biological contamination such as invasive plants or plant pathogens, several problems occur.

Seeds survive the washing process

Many invasive plants produce extremely resilient seeds that can survive:

• water exposure
• mechanical disturbance
• transport through treatment systems

These seeds can easily follow the soil through the washing process and remain viable afterward.

Roots and plant fragments can regenerate

Some invasive plants spread through root fragments or rhizomes. Even small pieces can regenerate and grow into new plants if they are not destroyed.

Soil washing may break the soil apart but does not reliably destroy plant material.

Risk of spreading invasive species

Because seeds and plant fragments can survive the process, soil washing may unintentionally spread invasive species rather than eliminate them.

For this reason, soil washing is generally not considered a reliable treatment method for soil contaminated with invasive plants or biological pests.

What is SoilSteaming?

SoilSteaming is a thermal soil treatment method that disinfects soil using heat.

Instead of separating contaminants from the soil, steam is used to raise the soil temperature to above 90°C.

At these temperatures, biological organisms cannot survive.

Soil steaming effectively eliminates:

• invasive plant seeds
• roots and rhizomes
• fungi
• bacteria
• nematodes
• insects and larvae
• soil-borne plant pathogens

The method has been widely used in horticulture, greenhouses, and plant nurseries to disinfect growing media and soil before planting.

How Heat Destroys Seeds and Plant Pathogens

Living organisms rely on proteins and cell structures that break down when exposed to high temperatures.

When soil temperatures exceed approximately 70–90°C, critical biological functions fail.

At these temperatures:

• seed viability is destroyed
• root tissue breaks down
• pathogens are inactivated

Unlike soil washing, which attempts to separate contaminants, soil steaming treats the entire soil volume.

This ensures that invasive species and plant pathogens are eliminated rather than redistributed.

SoilSteaming vs Soil Washing – Key Differences

Why Thermal Soil Treatment is Important for Invasive Species Control

The spread of invasive plants through soil transport is a growing challenge worldwide. Construction activities, infrastructure projects, and land development often move large volumes of soil between locations.

If soil containing invasive seeds or plant fragments is reused without proper treatment, new infestations can occur.

Effective soil treatment therefore requires technologies that destroy biological contamination rather than simply separating it.

Thermal soil treatment, such as SoilSteaming, provides a reliable way to eliminate invasive plant seeds, roots, and pathogens before soil is reused.

Soil washing and SoilSteaming are two very different soil treatment technologies.

• Soil washing is effective for removing chemical contaminants but does not destroy biological organisms.
• SoilSteaming disinfects soil using heat and eliminates invasive plant seeds, roots, and plant pathogens.

When soil is contaminated with invasive species or biological pests, SoilSteaming provides a far more reliable solution for safe soil reuse.

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2025 has been a year in which SoilSteam clearly moved from being a “promising technology” to a documented solution in real-world applications. We have experienced strong international interest, several important projects – and, not least, a clear direction: soil as a resource, not waste.

This was not just a demo – it marked that the market is now moving rapidly toward more circular solutions for soil management.

First major step in Sweden: EWGroup

In 2025, we took an important step into the Swedish market through our collaboration with EWGroup, which became the first operator in Sweden to implement the SoilSaver 20 at its facility in Flen. This marks the beginning of a broader commitment in the Swedish market, where the need for circular handling of soil masses and control of invasive species is growing rapidly.

Trafikverket and Svevia tested SoilSaver in a project in Umeå, Sweden

SoilSteam then entered into an agreement with Svevia and Trafikverket for the treatment and recovery of approximately 1,500 tonnes of soil masses infested with lupins in Umeå. The project was planned for completion during May–June 2025 and was described as SoilSteam’s first collaboration with Trafikverket in Sweden.

This sends a strong signal that our method addresses a growing need in European infrastructure projects: stopping the spread of invasive alien species while simultaneously reducing landfilling.

An international meeting place: SoilSteam Demo Day 2025

In the autumn of 2025, we gathered more than 200 participants from eight nations at Gjennestad in Vestfold for SoilSteam Demo Day. The event demonstrated how thermal treatment can transform contaminated or infested soil and peat into a valuable resource, both for construction projects and for greenhouse production.

Gavin Griffiths Group – Japanese knotweed and the first UK unit

In the UK, 2025 has been a breakthrough year. Together with the Gavin Griffiths Group, we have taken important steps to document effectiveness against Japanese knotweed. This work is linked to the launch of what has been described as the UK’s first steam treatment unit for soil at their facility in the summer of 2025.

This marks the beginning of a broader UK journey, where documentation and strong partnerships are central.

Our goal is to save as much soil as possible from being landfilled. During 2025, our fantastic customers used their SoilSaver machines to save more than 23,000 tonnes of soil from disposal. This took place in Norway, Sweden, and the UK. Without SoilSavers in the contracting industry, this would never have been possible. A huge thank you to everyone who made this happen 😊

Professional documentation and international relevance: Sardinia Symposium 2025

In September 2025, we also participated in the Sardinia Symposium, where we demonstrated how SoilSteam technology is already being used in practice across multiple segments – from road and construction projects to the reuse of growing media in greenhouse production.

For many, this comes down to a fundamental question: Is it possible to control pests and invasive species without destroying soil quality? Our experience and documentation clearly show that the answer is yes.

New applications: substrates and growing media

2025 has also been about growing media and circularity in greenhouse production. SoilSteam has published several articles on the reuse of substrates and how this can contribute to more sustainable production.

In the summer of 2025, we carried out our first research project documenting that peat and substrate products can be treated using our SoilSaver technology and reused instead of being replaced with new material. This represents a new way of thinking about circularity in international greenhouse production and will also lead to significant reductions in methane and CO₂ emissions.

New customers and new continents

The end of 2025 was intense. We held meetings with several stakeholders in greenhouse production, waste management, and the contracting industry across multiple countries. This resulted in several SoilSaver units being sold for delivery next year during the final months of 2025.

One of these units will be delivered to North America, becoming SoilSteam’s first machine operating outside Europe. This is a major milestone for SoilSteam.

What do we take with us into 2026?

2025 showed us three things very clearly:

1. The need for circular soil management is growing rapidly – across multiple industries at the same time.
2. SoilSteam is moving from “pilot” to “scalable practice.”
3. We have documented that soil steaming works – and people understand it. During 2025, we were contacted by more than 200 companies from 24 countries interested in SoilSteaming. We believe this strong interest will grow even further in 2026.

Thank you to our customers, partners, and everyone who met us in 2025 – we look forward to building further in 2026.
Merry Christmas and Happy New Year!

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This represents an important milestone for us – not only because we now have documented results from the UK, but also because we are working alongside one of the country’s leading experts in the field.

The background is a long-standing challenge faced by UK authorities:

• The spread of invasive species threatens nature and infrastructure
• Enormous volumes of soil are being sent to landfills instead of being reused

With SoilSteam SoilSaver, we have now demonstrated that there is a safe and effective way to address both of these issues at the same time. Together with Dr. Jones and other leading UK experts, we will continue to build evidence showing that SoilSteam can be a key part of the solution for these pressing challenges.

This is just the beginning of our journey in the UK – and we look forward to sharing more soon.

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For SoilSteam, this was an opportunity to demonstrate how steam-based soil remediation is now moving from experimental stage to industrial reality.

From Theory to Practice

For many years, the key question has been: Is it really possible to clean soil infested with invasive species and pathogens while preserving its natural qualities?
Our answer is a clear yes – and at Sardinia Symposium, we were able to show how SoilSteam technology is already being applied in practice, from landscaping and horticulture to full-scale agricultural operations.

Through controlled steam treatment, we restore a healthy microbiological balance in the soil – without the use of pesticides or chemicals.
The result is clean soil, ready for new growth, in a way that is both scalable and economically sustainable.

Research, Collaboration and Global Solutions

A central theme at this year’s conference was the need for circular and regenerative approaches in the global food system.
In our presentation, SoilSteam highlighted our collaborations with leading research institutions – which sparked great interest among both academics and industry professionals.

Our field data from large-scale commercial projects were particularly noted as an example of how technology can bridge the gap between research and real-world implementation.

A Global Commitment

SoilSteam received numerous inquiries from international stakeholders eager to understand how steam technology can be integrated into existing soil management systems.
It is clear that the challenges we are addressing – soil degradation, pollution, and unnecessary landfill disposal – are shared across borders.

The Road Ahead

Our participation at Sardinia Symposium marked not only a professional milestone, but also another step in SoilSteam’s mission to make sustainable soil recovery accessible to more people and industries.
Through continued research, strong partnerships, and by deploying our machines in an increasing number of countries, we aim to build technology that protects one of our most vital resources – the soil itself.

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