Thigmomorphogenesis, or Why Most Trees Don’t Fall Over

Name: Thigmomorphogenesis, or Why Most Trees Don’t Fall Over
Start: 2025-05-28T19:00:00-07:00
End: 2025-05-28T20:30:00-07:00
Location: The Alberta Rose Theatre

Schedule

Wed May 28 2025 at 07:00 pm to 08:30 pm

UTC-07:00

Location

The Alberta Rose Theatre | Portland, OR

Have you ever noticed a tree not fall over? A tree’s natural state is upright—it’s their default mode. Yet, myths pervade:
“You should thin your tree”
“You should top your tree”
“Douglas-firs have shallow roots”
“Lone trees are more likely to fall”
“The roots will ruin my foundation”
“That tree will fall and K*ll my whole family”
Despite the ubiquity of normal, upright trees around us, we often only notice those scattered few that stop being upright, most often in extreme weather. And frankly, those few sully the good reputation of the thousands of others.
In the Pacific Northwest, our trees grow to be some of the tallest and largest organisms on the planet, and that can be understandably intimidating as you watch them bend and sway during winter weather from your home. Luckily, our trees did not achieve their prominence by accident, and this talk will explain what the trees are doing, how they react to their environment, and what you can do to make sure your trees are safe.
How does a tree build itself? How does it choose which direction to grow? Is it a giant, static monolith waiting to crush everything beneath it? or a dynamic, self-optimizing living system that wants to keep itself upright arguably more than you? Join us on a journey through the lifecycle of a tree: how it grows, lives, and dies. In other words: how do trees become trees and what makes them so good at it?
An arborist, a dendrologist, an educator, Casey Clapp is the principal consultant with Portland Arboriculture and co-host/co-creator of CompletelyArbortrary, a weekly podcast about trees and other related topics.