Okay but did you know that trees send each other nutrients through an underground fungal network? Like, actually send resources to other trees that need them. Including trees of different species.

I learned about this from Suzanne Simard's research at UBC and I genuinely haven't stopped thinking about it for weeks.

The wood wide web (yes, that's what scientists call it)

So here's how it works. Tree roots form partnerships with mycorrhizal fungi — these tiny thread-like organisms that extend way beyond where the roots can reach. The fungi connect to multiple trees, forming a network that can span an entire forest.

Through this network, trees share carbon, water, nitrogen, and even defense signals. When a Douglas fir is attacked by insects, it sends chemical signals through the fungal network that essentially tell neighboring trees "hey, start producing defense compounds." The neighboring trees respond before the insects even reach them.

I mean... what?

Mother trees

Simard found that the oldest, largest trees — she calls them "mother trees" — act as hubs in this network. They're connected to hundreds of other trees and they preferentially send more resources to their own seedlings. They can recognize their own offspring through the network.

When a mother tree is dying, it dumps its carbon stores into the network. It's basically leaving an inheritance. For a tree.

I told my friend about this at dinner and she said "that's nice" and went back to her phone. I wanted to flip the table.

Why this matters beyond just being cool

Clearcut logging doesn't just remove trees. It destroys the network. A forest that gets clearcut and replanted isn't the same forest even if you put the same species back. The underground connections took decades or centuries to develop and they're gone.

Some logging companies are starting to use "retention forestry" where they leave mother trees standing during harvest. It's not perfect but the replanted areas recover measurably faster when the network is partially intact. There's a paper from 2019 in Nature that showed replanted areas with retained mother trees had 26% higher survival rates.

The part that keeps me up at night

We define intelligence as something that requires a brain. But this network makes decisions. It allocates resources. It responds to threats. It adapts.

Is it intelligence? Probably not by our definition. But our definition was built around animals that think like us. Maybe we're just bad at recognizing intelligence that works differently.

I don't have an answer. But every time I walk through a forest now I think about what's happening under my feet and it's honestly a little overwhelming.