JUST IN: 110 Quadrillion Kilometres of Mycorrhizal Fungi mapped (and What It Means for Gardeners)
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A new global study has revealed something extraordinary beneath our feet: the planet is threaded with vast underground networks of arbuscular mycorrhizal fungi. 110 quadrillion kilometers of it. That is enough fungal network to stretch from Earth to the Sun around 735 million times.
These fungi are not the mushrooms we see above ground. They are microscopic fungal networks that live in soil and form close partnerships with plant roots. They help plants access water and nutrients, while plants feed them with carbon-rich compounds produced through photosynthesis.
Recent reports from Phys.org and Grist highlight just how massive and important these networks may be. Scientists estimate that arbuscular mycorrhizal fungal networks stretch around 110 quadrillion kilometres across the planet.
That number is almost impossible to imagine. But here is the part gardeners should care about: these hidden fungal networks are directly connected to plant health.
As Toby Kiers, co-author of the study, told Grist: “Just as a circulatory system moves resources through a body, these sorts of microscopic fungal pipes are connected to plants.”
In other words, your garden soil is not just a place where roots sit. It is a living system.
Key Findings from the Article
The recent global mapping study gives us a much clearer picture of how important mycorrhizal fungi are for plant life, soil health and ecosystems.
Here are the key findings:
Scientists created the first global map of arbuscular mycorrhizal fungal networks.
This helps show where these underground networks are most dense, where they are threatened and where more research is still needed.
The study used more than 16,000 soil cores from around the world.
Researchers combined soil data, imaging and machine-learning models to estimate the density of fungal networks across different ecosystems.
The fungal networks may stretch around 110 quadrillion kilometres.
This makes them one of the largest hidden biological networks on Earth.
These networks may contain around 300 megatons of carbon.
That means mycorrhizal fungi are not only important for plants, but also for how carbon moves through soil ecosystems
A teaspoon of soil may contain up to 10 metres of fungal strands.
Even a tiny amount of healthy soil can hold an impressive living network.
Arbuscular mycorrhizal fungi form partnerships with around 70% of plant species.
Many plants rely on this relationship to help them access nutrients and water more efficiently.
Mycorrhizal fungi act like an extension of plant roots.
Their fine threads, called hyphae, can explore parts of the soil that roots cannot easily reach.
In healthy soils, these networks can greatly increase the area roots can explore.
This can help plants access nutrients such as phosphorus and improve their connection with the surrounding soil.
Large-scale agricultural areas may have much lower fungal network density.
The study suggests that croplands may have roughly half the arbuscular mycorrhizal fungal density found in wild ecosystems.
Soil disturbance matters.
Practices such as repeated tillage, heavy disturbance and poor soil management can physically disrupt fungal networks.
Mycorrhizal fungi under the microscope// Phys.org
What This Means for Gardeners
For gardeners, this is not just a science story. It is a root-zone story.
Your soil is alive.
It is not just a place to hold plants upright. It is full of hidden life that supports growth.
Healthy plants start underground.
Strong leaves, flowers and fruits usually begin with a strong root system.
Fungi can act like extra roots.
Mycorrhizal fungi grow fine threads around roots, helping plants explore more of the soil.
The root zone is where the magic starts.
If the area around the roots is healthy, active and biologically rich, plants have a better foundation.
Less digging can be a good thing.
Too much soil disturbance can break fungal networks before they fully develop.
Bare soil is not ideal.
Mulch, compost and living roots can help keep the soil environment more protected and active.
Fertiliser is not the whole story.
Plants do need nutrients, but they also need good soil biology to help access what is already around them.
Root contact matters.
Mycorrhizal fungi need to touch living roots to form a partnership, so placement is important.
Think teamwork, not just feeding.
The plant feeds the fungi. The fungi help the plant. Everybody wins.
How Gardeners Can Support Mycorrhizal Fungi
You do not need to completely change the way you garden. Small, consistent habits can make your soil more welcoming for beneficial fungi.
Gardeners can support fungal networks by:
Reducing unnecessary digging and soil disturbance.
Keeping soil covered with mulch or living plants where possible.
Adding compost or organic matter gradually.
Avoiding overuse of high-phosphorus fertilisers when they are not needed.
Keeping roots healthy during transplanting.
Applying mycorrhizal fungi directly near living roots.
The most important point is simple: mycorrhizal fungi need access to roots. They do not work properly if they are left far away from the root zone.
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