The Tomato Tree and Other Things I Didn't Know

Written by Joni Roberts

Traveler, storyteller, and public health advocate

I think I understood biodiversity before I came to Madagascar.

I understood it the way you understand something from a textbook. Conceptually. Accurately. But without the physical, slightly disorienting sensation of it standing in front of you, growing out of the ground in a shape you were not prepared for.

Madagascar has a way of making the conceptual very suddenly real.

I was introduced to the island's plant life through my study abroad partners — researchers and educators who work in this ecosystem regularly. People who know its logic, its patterns, and its surprises. Walking with them was not like reading a field guide. It was like having someone translate a language you didn't know you were surrounded by.

They walked me through trees and plants and fruiting things I had no framework for. They named things. Explained the relationships between them. Pointed out what was endemic, what had been introduced, what was slowly disappearing as forest cover shrank. It was a different kind of education than anything I'd had in a classroom — slower, more physical, harder to forget.

And then they showed me the tomato tree.

I need you to understand: not a vine. Not a shrub. Not a tomato plant the way I have understood a tomato plant to exist for my entire life — low to the ground, staked with twine, trained along a trellis.

A tree.

Fully upright. A real trunk. Standing on its own without any help. And tomatoes — actual tomatoes — growing from it.

I stood there and stared at it for what was probably an embarrassing amount of time.

It wasn't that I didn't believe it. It's that my brain had to physically rearrange a category it thought was settled. Tomatoes are small plants. Tomatoes grow on vines. Tomatoes do not grow on trees. Except here they do, and they have been doing it without my permission or awareness this entire time.

That's the thing about a place that has been isolated for 88 million years. It doesn't follow the templates you've built up elsewhere. It followed its own logic, its own evolutionary pressures, its own path — and occasionally it arrives at a conclusion that looks like a tomato hanging from a proper tree trunk.

And it's been doing that quietly, the whole time, whether or not anyone from outside thought it was possible.

There were other fruits I didn't recognize. Plants used medicinally in ways that aren't in any catalog I've read. Trees whose bark and leaves and roots all serve different purposes for different communities, knowledge passed down through people rather than institutions. My study abroad partners named them with a familiarity that reminded me what it means to truly know a place — or to commit yourself to learning it the way it deserves to be learned.

I kept thinking about how much of this knowledge lives in people, not in books. How much gets transmitted in the field, not in classrooms. How much disappears when a forest does — not just the species themselves, but the knowing. The understanding of what they are and what they do and how they connect to everything around them.

That's a kind of loss that doesn't make the headlines. But it's real.

I left that walk with a new personal rule.

Never assume you've correctly categorized something just because you've encountered a version of it before.

Because somewhere in the world, the tomato is a tree. And it has been, all along.

Stay open to being wrong about what you think you know. The most interesting things tend to live just past the edge of your existing categories.