The Underground Trade

Trees can't walk to the store. So how do they eat?

Here's the secret. Under the ground, wrapped around the roots of almost every tree, there are teeny-tiny threads — so thin you'd need a microscope to see them. They aren't part of the tree at all. They belong to a kind of mushroom friend called a fungus! The threads reach far out into the dirt and bring the tree water and food. And the tree says thank you by giving the fungus some of its sugar. They share!

God made trees with hidden helpers so they would always be fed. That's the kind of God He is — He loves to take care of living things, even with helpers far too small for us to see.

God feeds the trees. God feeds the birds. And God feeds you. You have helpers all around you that you can't even see, because God is always, always taking care of you.

A tree looks like it's standing there all by itself. It isn't. Almost every plant you've ever seen is plugged into a vast underground partnership — and most people walk right over it without ever knowing.

Here's how it works. Around 9 out of 10 kinds of plants team up with fungi in the soil. (Fungi are the family that includes mushrooms — but the mushroom you spot above ground is just the tip. Most of the fungus is a web of fine threads, called hyphae, spreading out underground.) These threads are far thinner than the thinnest root, so they squeeze into tiny spaces in the soil that roots are simply too big to enter. They fan out and gather water and minerals — especially one called phosphorus that plants desperately need but have a hard time finding.

Then they carry it all back to the plant. And the plant pays them — in sugar. Up in its leaves, the plant turns sunlight into sugar, then sends a big share of that sugar down to its fungus partners in the dark. Minerals going up, food going down. Neither one could thrive alone.

God set this up. The plant standing in the sun and the fungus hidden in the soil are feeding each other, and God designed the whole quiet exchange. He's the kind of Provider who builds provision right into the roots of the world — usually in places no one is looking.

The Bible says people who trust God are "like trees planted along a riverbank, with roots that reach deep into the water." Trees like that aren't afraid of a drought — their roots (and, it turns out, their hidden fungus partners) reach down to water that others can't see. When you trust God, He becomes the deep water your roots reach for. And a lot of how He takes care of you happens underground, where you can't watch it work — but it's working.

There's a story our culture loves: the self-made success, the person who pulled it off completely alone. Plants would find it hilarious.

The biggest, oldest tree in any forest is, underground, one of the most connected organisms alive. Strip away the soil and you'd find its roots fused into a sprawling network of fungal threads tying it to other trees, other species, the whole forest floor — kilometers of living filament packed into a single footstep of dirt. Through it move water, nitrogen, phosphorus, and carbon. And it isn't charity. Researchers have shown the exchange behaves like a market: plants send more sugar to the fungi that deliver more minerals, and fungi route more minerals to the plants that pay better. Both sides can detect a bad deal and respond to it. It's an economy older than money, running silently under your feet, and it's been balancing trades since before there were flowers.

Here's the part worth sitting with. The tree you'd point to as the strong, independent one is actually the most dependent — and that's not its weakness. It's the secret of its strength. It got big because it's connected, not in spite of it.

Scripture aims that straight at you: "Let your roots grow down into him, and let your lives be built on him." Not grow up — taller, more visible, more impressive. Grow down — into something hidden, into a source you didn't make and can't see. The same God who runs the underground economy of an entire forest is offering to be the thing your roots grow into.

You will feel enormous pressure, especially now, to look self-sufficient — to have it handled, to need no one, to be the finished, independent product. The forest says that's not even how the strongest living things work. The deepest-rooted, most-connected, most dependent tree is the one still standing after the drought. You were never meant to be self-made. You were meant to be deeply, invisibly rooted — and held by a Provider who does His best work underground.

Pull up a healthy plant — a tomato, a tuft of grass, an oak seedling — and you'll see roots. What you won't see is that those roots are almost certainly not feeding the plant by themselves. The vast majority of land plants — by many estimates around ninety percent — live in partnership with fungi threaded into and around their roots, and for a great many of them the fungus does most of the actual mining. Its filaments are finer than the slenderest root hair, so they reach into pockets of soil roots can't enter, scavenging phosphorus, nitrogen, and water and ferrying them back. In return the plant pays in sugar and fat — carbon it pulled out of thin air with sunlight, by some estimates up to a fifth of everything it makes, sent down into the dark to a partner it will never see. A single teaspoon of living soil can hold several miles of these fungal threads. The wheat in your bread, the apple in your hand, the coffee in your cup: almost none of it was grown by a plant feeding itself. It was traded up to you, through a partner underground, in an exchange you had no idea was happening.

And this is the part no one can yet tie off. We have known this partnership exists for over a century, but each careful re-examination has loosened, rather than settled, the popular account of it. For a while the story hardened into something tidy and beautiful — a "wood wide web," wise old "mother trees" deliberately nursing their seedlings through the network, a forest sharing its wealth like a family. Then, in 2023, a careful review of the actual evidence pumped the brakes: much of that popular picture, it turned out, had run well ahead of the data. We still do not know how much resource really moves tree-to-tree in a wild forest, or whether the fungus is a generous courier or a self-interested broker running its own economy and taking a cut. We can show the exchange behaves like a market — partners rewarding good trades, penalizing bad ones — without being able to say who, if anyone, is in charge of it. Every sharper instrument we take underground returns the same verdict: the dirt beneath a single footstep is running an exchange more tangled than the tidy fable we told about it. That is not a failure of the science; it is the texture of a creation that keeps having more packed into it than we had settled for.

Stand back and notice what kind of world this is. The food that keeps you alive does not, for the most part, arrive because you arranged it, or even because the plant managed it alone. It comes up through a hidden web of give-and-take that was running long before you were hungry and will go on running whether or not you ever learn it's there. Jesus pointed at exactly this and told a chronically anxious species to look closely at how the living world is actually fed: the birds don't store up barns, the wildflowers don't spin thread, "and yet your heavenly Father already knows all your needs." He wasn't waving the question away. He was pointing underneath it — to a Provider who builds the supply lines into the roots of the world and keeps them running in the dark, unwatched, unthanked, entirely faithful.

Most of our exhaustion is the labor of trying to be our own root system — to mine every mineral ourselves, to see every supply line, to personally guarantee that next month works out. The plant in your garden is, by that standard, doing it all wrong, and thriving. It pours its energy into the one thing it is actually built for — turning light into sugar — and trusts a partner it cannot see for the rest. "Seek the Kingdom of God above all else," Jesus said, "and he will give you everything you need." The provision was never going to come from your frantic oversight of it. It was always going to come up through the dark, from the hands of a God who has been feeding things He loves, underground and unseen, since before there were roots to feed.