Can Hemp Help Repair Damaged Soil? Tap Roots, Mine Sites & Phytoremediation

Hemp is usually talked about for what it can become: clothing, food, oil, skincare, building materials, animal bedding, paper, packaging and more.

But one of the most exciting conversations around industrial hemp is not just what we can make from it. It is what the plant may be able to do while it is growing.

Industrial hemp is being studied around the world for its potential role in phytoremediation — the use of plants to help manage, stabilise or remove contaminants from soil and water.

That means hemp is not just a crop with commercial potential. It may also have a role to play in damaged soil, degraded land, mine site rehabilitation, PFAS research, heavy metal contamination and future regenerative farming systems.

For a plant that has already been underestimated for decades, that is a pretty big deal.

What is phytoremediation?

Phytoremediation is the use of plants to help clean, stabilise or manage polluted environments.

Different plants can interact with contaminants in different ways. Some may absorb certain substances into their roots, stems or leaves. Some may help stabilise contaminants so they are less likely to move through soil or water. Others may support soil microbes that help break down or transform pollutants.

It is not a quick fix, and it is not suitable for every site. But it is an exciting field because plants can sometimes provide a lower-impact, lower-disruption option compared with digging up and moving contaminated soil.

For large areas of degraded land, old industrial sites, mine sites or PFAS-affected soils, the idea of using plants as part of a remediation strategy is powerful.

Why hemp is being studied for damaged soil

Industrial hemp has several traits that make it interesting to researchers looking at soil repair and phytoremediation.

• It grows quickly, producing useful biomass in a relatively short growing season.
• It develops a strong root system, including a tap root and fibrous roots that interact with the soil.
• It can produce a dense canopy, helping cover soil and reduce erosion pressure.
• It has multiple end uses, depending on whether the crop is grown for fibre, seed, hurd, biomass or research.
• It can be used as a rotation crop, helping farmers diversify and potentially support soil health between other crops.

The Victorian parliamentary inquiry into the industrial hemp industry found that hemp has enormous benefits for improving damaged soils and should be encouraged as an important rotation crop on Victorian farms.

That matters because hemp is not just being discussed by enthusiasts anymore. It is being discussed in government reports, parliamentary inquiries, research papers and agricultural policy conversations.

The hemp tap root: why everyone talks about it

One of hemp’s most interesting features is its root system.

Hemp can develop a strong tap root, supported by lateral and fibrous roots. In healthy growing conditions, that root system helps the plant access water and nutrients while also interacting with the soil profile.

From a farming point of view, roots matter. They can help with soil structure, water infiltration, microbial activity and the way organic matter moves through the soil. In degraded or compacted soils, deep-rooted crops can be especially interesting because they may help open up the soil profile over time.

For phytoremediation, roots are also important because many contaminants are held in or around the soil. The root zone is where the plant, soil, microbes, water and contaminants all meet.

That is why hemp’s tap root deserves its own spotlight. It is not just the above-ground plant that matters. The underground architecture may be one of hemp’s most useful features.

Hemp and mine site rehabilitation

Mine sites and post-industrial land can leave behind some of the hardest soil challenges: compaction, low organic matter, altered pH, poor structure, erosion, salinity, heavy metals and other contaminants.

Hemp is being looked at with interest because it may offer a combination of soil coverage, biomass production and contaminant tolerance. Research reviews have discussed hemp’s potential for heavy metal phytoremediation, including contaminants such as cadmium, lead, arsenic, nickel and zinc.

This does not mean hemp can simply be planted on any mine site and magically fix it.

Site rehabilitation is complex. Soil testing, contaminant mapping, water movement, microbial life, climate, erosion control, plant selection, biomass disposal and long-term monitoring all matter.

But hemp may have a role as part of a broader rehabilitation plan, especially where the goal is to stabilise soil, produce biomass, improve cover and investigate plant-based contaminant management.

Hemp and heavy metals

Heavy metals are one of the main areas where hemp phytoremediation research has gained attention.

Some studies have found that hemp can tolerate and accumulate certain metals, with uptake often concentrated in the roots. That is useful from a remediation point of view because it suggests hemp may help capture or stabilise some contaminants without immediately failing as a crop.

But this is also where the safety conversation becomes serious.

If hemp absorbs heavy metals from contaminated soil, those metals may end up in the plant material. That biomass cannot be treated like ordinary hemp. It should not enter the food chain, skincare supply chain, animal feed, compost or clothing production unless it has been proven safe and legally suitable.

In remediation, the crop is not grown to become a shirt. It is grown to help manage land.

Hemp and PFAS: promising, but not simple

PFAS are sometimes called “forever chemicals” because they are extremely persistent in the environment.

CSIRO describes PFAS as a large group of synthetic chemicals found in many consumer, industrial and commercial products. Their useful properties — such as heat resistance, stain resistance and chemical stability — are also what make them so difficult to manage once they enter soils, water and ecosystems.

Researchers are now investigating different ways to detect, monitor, capture, destroy or reduce PFAS contamination. CSIRO notes that its work includes treatment technologies and practices such as thermal decomposition, bioremediation and biomass absorption.

Hemp has entered this conversation because some trials have found hemp can take up certain PFAS compounds. A 2024 field trial at a former air base found hemp uptake of several PFAS compounds, with more uptake for some shorter-chain compounds than others.

But the same study also made the limitation clear: hemp phytoremediation does not currently offer a complete solution for PFAS-contaminated soil.

That is the honest and exciting part. Hemp is not a magic wand. It is a serious research candidate.

What happens to contaminated hemp biomass?

This is one of the biggest questions in hemp remediation.

If hemp is grown to absorb contaminants, what happens to the harvested plant material?

That biomass may need to be removed, contained, destroyed, stabilised or processed through specialist remediation pathways. Researchers are studying approaches such as thermal treatment and other technologies, but this is still an emerging area.

This is why hemp phytoremediation should not be oversold as “plant it and walk away.” The full system matters:

• What contaminant is present?
• Where in the plant does it accumulate?
• How much is removed from the soil?
• How many crop cycles are needed?
• What happens to the harvested biomass?
• Can the process be monitored safely?
• Does it reduce risk at the site?

When those questions are answered well, hemp may become part of a future toolkit for land rehabilitation and contaminant management.

Hemp as a regenerative rotation crop

Even outside contaminated sites, hemp has value as a farming crop.

Hemp grows quickly and can produce significant biomass. It can be used in rotation with other crops, helping farmers diversify production and potentially support soil cover, organic matter and broader soil health goals.

In regenerative farming, the aim is not simply to extract as much as possible from land. The aim is to build living systems: better soil structure, more ground cover, healthier microbial life, water resilience and more diverse rotations.

Hemp fits naturally into that conversation because it is a multi-use crop. It can support fibre, food, oil, hurd, mulch, animal bedding, building materials and future biomaterials. The same plant can feed multiple industries.

That is one of the reasons we keep backing hemp. It is not a one-product crop. It is an industry crop.

Why this matters for Australian hemp

Australia has enormous potential for industrial hemp, but the industry still needs scale, infrastructure and public understanding.

Agriculture Victoria explains that licensed industrial hemp crops in Victoria can be harvested and processed for seed food and fibre, depending on THC testing and legal requirements. The Victorian Government has also been considering stand-alone industrial hemp legislation to reduce stigma, clarify the crop’s legal status and support industry growth.

That kind of policy shift matters. Hemp has spent too long being misunderstood because of its relationship to cannabis. Industrial hemp is a low-THC agricultural crop with serious potential across food, fibre, construction, packaging, textiles, biofuels, seed oils and land-use research.

The more clearly hemp is treated as agriculture, the easier it becomes for farmers, processors, researchers and businesses to build the industry properly.

What does this have to do with hemp clothing?

Everything.

When you buy hemp clothing, you help create demand for hemp fibre. When there is demand for hemp fibre, there is more reason to grow hemp. When more hemp is grown, there is more incentive to invest in processing, research, crop trials, genetics, fibre technology and regional manufacturing.

That does not mean your hemp shirt came from a remediation crop. It absolutely should not.

It means the clothing market is one visible, wearable part of a much bigger hemp story.

A 100% hemp shirt is not just a shirt. It is a vote for a crop that can be worn, eaten, pressed into oil, turned into building material, studied for soil repair and used to help rethink what Australian agriculture can become.

Common questions about hemp and phytoremediation

The bottom line

Hemp is exciting because it is not just one thing.

It is a fibre crop. A food crop. A building material crop. A rotation crop. A soil-cover crop. A research crop. And potentially, in the right settings, part of a future toolkit for damaged land and contaminated soil.

Phytoremediation is still an emerging field, and hemp should not be oversold as a miracle clean-up plant. But the fact that researchers, governments and industry bodies are even studying hemp for PFAS, heavy metals, damaged soils and mine site rehabilitation tells us something important.

Hemp belongs in the future.

At Made In Hemp, that is why we keep supporting the plant from every angle: clothing, food, skincare, farming, education and advocacy.

Explore our Pure Hemp Clothing and Linen Collection, browse hemp and bamboo clothing, or read more about why hemp clothing supports a bigger crop story.

Further reading

• CSIRO: Per- and Polyfluoroalkyl Substances (PFAS)
• Victorian Parliament: Inquiry into the Industrial Hemp Industry in Victoria
• Agriculture Victoria: Industrial Hemp in Victoria
• Victorian Government: A New Era for Industrial Hemp in Victoria
• Environmental Science: Advances: Hemp Phytoextraction and PFAS Degradation in Harvested Plants