- Authors
- Name
- Youngju Kim
- @fjvbn20031
- The Forest Is Never Alone
- The Mycorrhizal Network: How It Actually Works
- Mother Trees: The Senior Developer in the Forest
- Chemical Warnings: Building Psychological Safety
- Gemeinschaft vs. Gesellschaft: Two Kinds of Community
- The Dying Tree's Last Gift
- Five Mentorship Lessons for Developer Teams
- Closing: The Forest Knows
- References
The Forest Is Never Alone
Stand in a forest, and every tree looks like a solitary competitor — each reaching upward for its share of light, each fighting its neighbors for water and nutrients. This is how we learned to see forests in school: a Darwinian battleground of individual organisms.
That picture is wrong.
Beneath your feet, a network of fungal threads connects the roots of trees across acres of land, transmitting carbon, phosphorus, nitrogen, and chemical signals between individuals. Trees are not competitors locked in silent war. They are participants in one of the longest-running collaborative networks on Earth.
British Columbia forest ecologist Suzanne Simard spent decades proving this. In 1997, she published a landmark paper in Nature demonstrating, using radioactive carbon isotopes, that trees of different species transfer carbon to each other through mycorrhizal fungal networks (Simard et al., 1997). The scientific establishment was initially skeptical. The popular press gave it a better name: the Wood Wide Web.
For those building software teams, this discovery carries lessons that go far beyond metaphor.
The Mycorrhizal Network: How It Actually Works
Mycorrhiza (from the Greek mykes — fungus, and rhiza — root) is the symbiotic association between a fungus and the roots of a plant. In a mycorrhizal relationship, the fungus extends the plant's root system with a network of thin filaments called hyphae, reaching into soil that the roots themselves can't access. The fungus delivers phosphorus and nitrogen to the plant; the plant provides sugar (photosynthesized carbon) to the fungus.
Textbook symbiosis. But here's where it gets interesting.
When hyphae from multiple trees connect, they form a network through which resources flow not just between one tree and its fungal partner, but between trees across the forest. An estimated 90% of land plants live in symbiosis with mycorrhizal fungi, and many of these networks are densely interconnected (Van der Heijden et al., 2015).
What flows through the network:
| Resource | Direction | Analogy |
|---|---|---|
| Carbon (sugar) | Established trees → seedlings | Senior sharing expertise |
| Phosphorus, nitrogen | Fungal network → trees | Infrastructure enabling growth |
| Chemical warning signals | Attacked tree → neighbors | Psychological safety signals |
| Stress compounds | Dying tree → neighbors | Knowledge transfer before departure |
Mother Trees: The Senior Developer in the Forest
Simard's most profound discovery is the concept of the mother tree. Old, large trees occupy the most connections in the mycorrhizal network — they are the hubs. And these hub trees actively send carbon to seedlings growing in their shade, including seedlings of different species (Simard, 2021).
In a direct experiment, Simard's team fed radioactive carbon dioxide to a large Douglas fir. Days later, the labeled carbon appeared in nearby seedlings — even seedlings in deep shade that could not photosynthesize enough to sustain themselves. The mother tree was subsidizing its younger neighbors.
More striking: the mother trees sent more carbon to their own kin (seedlings grown from the same parent) than to unrelated seedlings (Simard et al., 1997). They recognized their offspring through the network and invested preferentially.
Now think about the best senior developer you've ever worked with.
They weren't hoarding their knowledge as job security. They were actively feeding the seedlings. They answered questions they'd already answered a hundred times, with patience, because they understood that a seedling in the dark will die without carbon. They made their expertise available — not performatively, but through thousands of small daily transfers: a careful PR comment, a thirty-minute pairing session, a document written for the next person who'd join the team.
That's a mother tree.
Chemical Warnings: Building Psychological Safety
The mycorrhizal network isn't the only communication channel in the forest. Trees also communicate through the air.
When a tree is attacked by insects, it releases volatile organic compounds (VOCs) — airborne chemical signals. Neighboring trees detect these signals and begin producing defensive compounds before they are attacked themselves (Baldwin & Schultz, 1983). The warning travels faster than the threat.
The translation for teams: I'm under attack. You're fine right now, but prepare.
This is psychological safety in chemical form. And it works because the trees "trust" the signal. There's no evolutionary incentive to false-alarm your neighbors. The signal is reliable because it costs the sender something to produce it.
Amy Edmondson defined psychological safety as "a belief that one will not be punished or humiliated for speaking up with ideas, questions, concerns, or mistakes" (Edmondson, 1999). Google's Project Aristotle (2012-2016) analyzed 50,000 hours of data from 180 teams and found that psychological safety was the single most predictive factor of team effectiveness — above individual talent, above team composition, above everything else.
A team where warning signals can flow freely is a team that catches fires early. A team where people fear ridicule will let small fires become production infernos.
The senior developers and managers who go first — who say "I don't know this," "I made a mistake in that design," "this process is not working" — are the trees releasing VOCs. They make it safe for everyone else.
Gemeinschaft vs. Gesellschaft: Two Kinds of Community
German sociologist Ferdinand Tönnies gave us a distinction that haunts every tech company (Tönnies, 1887):
Gemeinschaft (community): Natural bonds, shared values, relationships where people are valued as whole persons. Families, true friendships, villages.
Gesellschaft (society): Contractual relationships, instrumental interests, relationships where people are valued for their role and function. Companies, markets, bureaucracies.
Most tech companies are Gesellschaft structures trying to generate Gemeinschaft behavior. They want engineers to care deeply about their work and their teammates — the emotional texture of community — while operating under quarterly OKRs and performance ratings — the mechanics of contractual society.
The forest solves this through what Tönnies didn't have words for: emergent community arising from mutual self-interest. The mother tree feeds seedlings not out of altruism, but because a healthy forest — with diverse tree sizes, ages, and species — is more resilient to drought, fire, and disease. Individual trees survive better when the network is healthy.
Senior developers who invest in juniors end up with more capable, more independent colleagues. Teams with high psychological safety ship better software. The forest teaches us that Gemeinschaft doesn't have to be designed from above. It emerges when the network conditions are right.
The Dying Tree's Last Gift
In Finding the Mother Tree, Simard writes about a discovery she made after her own cancer diagnosis. Dying trees, she found, release large pulses of carbon to the surrounding network in their final days — a last transfer of accumulated resources to the living (Simard, 2021).
"It was as if the trees were recognizing their own mortality and responding to it by giving to those who would live on."
This is the most affecting image in all of forest ecology. A tree that took decades to accumulate its carbon wealth dispersing it, at the end, into the community that will continue after it.
Every engineer who leaves a team faces this moment. Do you leave behind the knowledge you accumulated — the ADRs, the documented gotchas, the architectural reasoning, the onboarding guide written for the next person? Or does the knowledge die with your departure?
The forest has been practicing knowledge transfer since before the Carboniferous. We can learn from it.
Five Mentorship Lessons for Developer Teams
1. Identify Your Mother Trees
Every team has them: the senior engineers who quietly subsidize the learning of everyone around them. Make sure they are recognized, not just for their individual technical output, but for the network value they provide. Protect their time for mentoring. And if you're a senior engineer reading this — ask yourself honestly whether you're acting as a mother tree or hoarding carbon.
2. Send Warning Signals Early
Don't carry problems alone. Technical debt accumulating, architectural concerns forming, personal burnout approaching — these are warning signals that cost you nothing to share and could help your colleagues prepare. The tree that releases VOCs is not showing weakness. It's building collective resilience.
3. Build Psychological Safety Deliberately
The most important thing a team lead can do is go first. Share your own ignorance. Acknowledge your mistakes in team settings. Ask questions that sound naive. When the senior engineers demonstrate that it's safe to not know things, the whole team's learning rate accelerates.
4. Create Gemeinschaft Conditions
You cannot mandate belonging. But you can create conditions where it emerges. Informal tech talks where people share what they're learning. Pair programming that isn't about efficiency, but about transfer. One-on-ones that ask about the whole person, not just the sprint velocity. Team events that exist for connection, not performance. These are the mycelial threads.
5. Document Your Carbon Before You Leave
When you change teams or roles, leave your carbon behind. Write the ADR for that decision that lives only in your head. Document the non-obvious constraints in the legacy system. Record the "why" behind the architecture, not just the "what." Write the onboarding guide you wish had existed when you joined. This is how the network keeps its knowledge after individual nodes depart.
Closing: The Forest Knows
The German word Waldeinsamkeit captures something real — the particular peace of standing alone in a forest. But the science tells us that the peace is not solitude. It is connection.
Every tree you stand among is linked to its neighbors. Resources are flowing. Signals are passing. Old trees are feeding young ones. Dying trees are making final gifts. The forest is not a collection of solitary competitors. It is a community that has been practicing distributed collaboration for longer than our species has existed.
The best engineering teams look like this: experienced engineers feeding knowledge to newer ones, warning signals flowing freely before problems become crises, individuals valued not just for their output but for what they contribute to the network.
You are not a lone tree. Plant yourself in a forest, and grow your mycelium wide.
References
- Simard, S.W. et al. (1997). Net transfer of carbon between ectomycorrhizal tree species in the field. Nature, 388, 579-582.
- Simard, S. (2021). Finding the Mother Tree: Discovering the Wisdom of the Forest. Knopf.
- Wohlleben, P. (2016). The Hidden Life of Trees. Greystone Books.
- Van der Heijden, M.G.A. et al. (2015). Mycorrhizal ecology and evolution. New Phytologist, 205(4).
- Edmondson, A. (1999). Psychological safety and learning behavior in work teams. Administrative Science Quarterly, 44(2).
- Baldwin, I.T. & Schultz, J.C. (1983). Rapid changes in tree leaf chemistry induced by damage. Science, 221(4607).
- Tönnies, F. (1887). Gemeinschaft und Gesellschaft. Fues's Verlag.