Introduction to Dr. Alex Shigo

Roger 0:02

Talking Trees with Lillian Jadd . Welcome to Talking Trees . Today we explore the life and work of Dr Alex Shigo , the pioneer of modern arboriculture . Shigo revolutionized tree care with his concept of CODIT Compartmentalization of Decay in Trees shifting how we approach tree biology and management . We'll dive into his biography , his contributions to the field and insights from a video where Shigo himself discusses Cotted and Tree Biology . Get ready to learn about Shigo's lasting impact on arboriculture .

Jad 0:44

All right , let's jump into our deep dive today , and you know , I think , we're going to explore the work of a true legend in our field , dr Alex Shigo .

Lilly 0:53

Yes .

Jad 0:54

Now as a professional arborist , you know . I'm sure you've heard the name .

Lilly 0:59

Of course .

Jad 0:59

You're familiar with some of his revolutionary ideas about tree care .

Lilly 1:03

Absolutely .

CODIT and the Four Walls

Jad 1:05

He's often called the father of modern arboriculture .

Lilly 1:08

He is .

Jad 1:09

And for good reason . His research completely transformed the way we approach tree care .

Lilly 1:15

Yeah .

Jad 1:16

We're talking about a time when pruning practices were more about aesthetics than tree health . Right , and the invention of the one-man chainsaw oh yeah , gave Shigo a new tool for understanding trees .

Lilly 1:26

That's right . Before Shigo , a lot of our knowledge about tree decay came from studying cross sections of wood . Yeah , but with the chainsaw he could create these incredible longitudinal sections , like slicing a loaf of bread lengthwise . Suddenly , you could see the pathways of decay in 3D tracing how it spreads within the tree .

Jad 1:44

And that's where his groundbreaking discovery of Cody comes in .

Lilly 1:47

Yes .

Jad 1:48

Compartmentalization of decay in trees .

Lilly 1:51

Compartmentalization of decay in trees .

Jad 1:53

He realized that trees don't heal wounds in the same way our skin does .

Lilly 1:57

Right .

Jad 1:57

They don't regenerate tissue , nope , they compartmentalize .

Lilly 2:00

Think of it as the tree building internal walls to seal off the decay , preventing it from spreading further .

Jad 2:07

Okay .

Lilly 2:07

And each wall has a specific function in this defense mechanism .

Jad 2:11

So let's break down these walls , because this is where it gets really interesting for us arborists .

Lilly 2:15

Yes , it is .

Jad 2:16

Wall one , the strongest forms right after injury , plugging the vascular system above and below the wound .

Lilly 2:22

Right .

Jad 2:22

What's so cool is that this wall prevents the vertical spread of decay .

Lilly 2:26

That's right .

Jad 2:27

Then you've got wall two , which runs perpendicular to the grain .

Lilly 2:29

Yep .

Jad 2:30

Slowing the inward spread .

Lilly 2:31

It's like the tree is reinforcing its defenses , building a fortress against the invading decay .

Jad 2:37

Wall three is fascinating because it's formed by the growth rings limiting the lateral spread . Right it's like the tree is creating a time capsule of the injury . Yeah , Limiting the lateral spread Right . It's like the tree is creating a time capsule of the injury . Yeah , and finally , wall four the barrier zone forms as new wood grows around the wound , completely isolating the damaged tissue .

Lilly 2:53

Shigo's CODIT model showed us that trees are incredibly resilient , capable of fighting off decay and continuing to thrive even with significant internal damage .

Roger 3:03

Yeah .

Lilly 3:04

And his findings had huge implications for how we approach pruning .

Jad 3:07

You can't talk about Shigo without talking about his famous phrase touch trees . Oh , yeah , he wasn't just talking about the physical act of touching a tree . It was about connecting with trees on a deeper level .

Lilly 3:17

Right .

Jad 3:17

Understanding their biology and respecting their natural defenses .

Lilly 3:20

He believed that by truly

"Touch Trees" Philosophy

Lilly 3:22

understanding how trees work , we could provide better care and make more informed decisions about pruning , tree selection and even planting . He encouraged people to see trees as complex living beings , not just static objects in the landscape .

Jad 3:35

It's like he was saying hey , if you're going to work with trees , you need to speak their language .

Lilly 3:39

Absolutely .

Jad 3:40

And Kodut was his way of translating that language for us .

Lilly 3:43

Absolutely , and he wasn't afraid to challenge the status quo . Oh yeah , shiga was very vocal about his criticisms of common pruning practices .

Jad 3:52

Yeah .

Lilly 3:52

Like flush cuts that removed the branch collar . Uh-huh . He argued that these practices actually weakened trees .

Jad 3:59

Yeah .

Lilly 3:59

And made them more susceptible to decay .

Jad 4:02

Remember that quote where he said scant attention is given to pruning as it affects the health of trees , while great attention has been given to pruning as it affects the desires of man .

Lilly 4:12

He really hit a nerve with that one .

Jad 4:14

He did . Shigo was a champion for trees , advocating

Challenging Tree Care Conventions

Jad 4:18

for practices that prioritize their long-term health and well-being .

Lilly 4:21

Yes .

Jad 4:22

Even if it meant clashing with conventional wisdom or aesthetic preferences .

Lilly 4:26

Right .

Jad 4:27

His work really sparked a revolution in the arboriculture world it did , leading to the development of new pruning standards and techniques that are still used today .

Lilly 4:36

It's amazing to think about how much our understanding of tree care has evolved thanks to Shigo's research .

Roger 4:42

Yeah .

Lilly 4:42

He really laid the foundation for modern arboriculture .

Jad 4:46

He did . Yeah , his influence goes beyond just pruning . Yeah , shigo really opened our eyes up to the incredible complexity of trees as living organisms .

Lilly 4:54

Absolutely .

Jad 4:55

He talked about trees as generating systems Right , constantly growing and adapting to their environment .

Lilly 5:00

It's a fascinating concept . He compared trees to the human body , always replacing old cells with new ones , constantly regenerating and renewing itself , and this understanding is crucial for us as arborists .

Jad 5:12

Right , because it changes the way we think about wounds and decay .

Lilly 5:15

Exactly .

Trees as Dynamic Living Systems

Jad 5:16

It's not just about removing the damaged parts . It's about understanding how the tree responds to those injuries and how we can support its natural defenses .

Lilly 5:24

He was adamant that we stop seeing trees as static objects and start recognizing them as dynamic living systems constantly interacting with their surroundings , and this shift in perspective has had a profound impact on how we approach tree care .

Jad 5:40

He even challenged the traditional view of heartwood .

Lilly 5:42

He did .

Jad 5:43

Which was often dismissed as just dead tissue Right . But Shigo argued that heartwood plays a crucial role in the tree's defense system .

Lilly 5:51

He pointed out that heartwood is incredibly strong and resistant to decay . It provides structural support and acts as a barrier against further spread of decay . He even called it protection wood , emphasizing its vital function in the tree's overall health .

Jad 6:07

I remember when I first learned about Shigo's ideas about heartwood .

Lilly 6:11

Yeah .

Jad 6:11

It was like a light bulb went off Right . Suddenly I realized we've been underestimating the complexity and resilience of trees for far too long .

Lilly 6:19

Absolutely .

Jad 6:20

And he debunked a lot of misconceptions about heart rot .

Lilly 6:22

He did .

Jad 6:23

He showed that the presence of decay in the heartwood doesn't necessarily mean the tree is doomed .

Lilly 6:28

Right .

Jad 6:28

In fact , trees have evolved to compartmentalize decay and continue thriving even with significant heartwood loss . That's right . He encouraged us to look beyond the visible symptoms and understand the tree's internal mechanisms for dealing with decay . He wanted us to see the bigger picture and appreciate the incredible adaptability of trees .

Lilly 6:48

Shigo's work was groundbreaking , not just for its scientific rigor , but also for his ability to communicate complex ideas in a way that was accessible and engaging . He didn't just publish his findings in academic journals

Dr. Shigo's Enduring Legacy

Lilly 7:05

he wrote books , gave lectures and traveled the world sharing his passion for trees with anyone who would listen .

Jad 7:07

He was a true advocate for trees , always pushing for better understanding and more informed tree care practices , and his legacy continues to inspire arborists around the world .

Lilly 7:17

What's remarkable is that Shigo didn't just present his findings as absolute truths . He encouraged critical thinking and further research , urging others to build upon his work and continue exploring the mysteries of trees .

Jad 7:29

He often said that we should never stop learning , that the world of trees is full of wonder and complexity , and that there's always something new to discover . He saw himself not as the final authority , but as a guide , inviting others to join him on this journey of discovery .

Lilly 7:43

Yeah , and he gave us the tools to do just that . You know his coded model , his research on pruning , his insights into tree biology . His legacy is a call to action for all of us in the arboric culture field .

Jad 7:54

It is .

Lilly 7:55

It's a reminder to keep learning , keep asking questions and keep pushing the boundaries of our understanding of trees .

Jad 8:00

So the next time you're out in the field working with trees , remember Dr Chigot and his message . Touch those trees , feel their energy and appreciate their complexity . Use his insights to make informed decisions and provide the best possible care for these magnificent living beings . For these magnificent living beings .

Roger 8:21

Thank you for joining us on this episode of Talking Trees . Today we celebrated the groundbreaking contributions of Dr Alex Shigo his revolutionary cottage concept , his hands-on approach to understanding wood decay and his challenge to traditional arboricultural practices . We hope his legacy inspires you to look deeper into the science and art of tree care . Until next time , keep touching the roots of nature .