Completely Arbortrary

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Completely Arbortrary Welcome to Completely Arbortrary, the podcast about trees and other related topics. What's up, Fungal Associates!

This weekly podcast is a scientific look at trees and how they affect and are affected by everything, hosted by master arborist and environmental educator Casey Clapp and his tree-curious friend and musical artist Alex Crowson. Each episode features a tree from around the world and a discussion about its unique position in culture, ecology, and history. These discussions can range from urban fores

try and evolutionary biology to folk mythology and popular culture. The hard science is framed in plenty of silliness, with a casual tone, games and parody songs, and the titular arbitrary numerical rating of the tree at the end of each episode. This podcast's mission is to provide approachable science to audiences of all experience levels and reconnect people to the natural elements around them, whether deep in the forest or just outside their front door.

NEW EPISODE: European PlumGrab some zwetschgenkuchen and dig into a brand new episode of Plant Based Diet: Just Desserts...
18/09/2025

NEW EPISODE: European Plum

Grab some zwetschgenkuchen and dig into a brand new episode of Plant Based Diet: Just Desserts, with the European plum (Prunus domestica).

Listen anywhere you get your pods!

🌳CONE CLUB STICKER OF THE MONTH: Water oak with minnows by  - JOIN THE CLUB IN THE BI0This month's Cone Club sticker is ...
16/09/2025

🌳CONE CLUB STICKER OF THE MONTH: Water oak with minnows by - JOIN THE CLUB IN THE BI0

This month's Cone Club sticker is the gorgeous water oak (𝘘𝘶𝘦𝘳𝘤𝘶𝘴 𝘯𝘪𝘨𝘳𝘢) and it's cute lil acorns, hangin' in the water, providing habitat for some friendly little minnows. has done it again.

DID YOU KNOW there's a Club you can join that will not only send you a new botanical sticker every month, but grant you access to over 50 stickers from months gone by? It's the Cone Club! (link in bio)

There are oaks! At the bottom of the ocean!

NEW EPISODE: Keyaki 🇯🇵The tree you don’t know that you know, but you know it! The Japanese zelkova (Zelkova serrata) is ...
31/07/2025

NEW EPISODE: Keyaki 🇯🇵

The tree you don’t know that you know, but you know it! The Japanese zelkova (Zelkova serrata) is the center of a fascinating tale of isolationism, plant espionage, and gunboat diplomacy.

TOMORROW! Who could it tree now?
30/07/2025

TOMORROW! Who could it tree now?

NEW EPISODE: Dial M for (Maxipiñon) 𝘗𝘪𝘯𝘶𝘴 𝘮𝘢𝘹𝘪𝘮𝘢𝘳𝘵𝘪𝘯𝘦𝘻𝘪𝘪A mystery cone… a mystery tree! What the maxipiñon has to say ab...
17/07/2025

NEW EPISODE: Dial M for (Maxipiñon) 𝘗𝘪𝘯𝘶𝘴 𝘮𝘢𝘹𝘪𝘮𝘢𝘳𝘵𝘪𝘯𝘦𝘻𝘪𝘪

A mystery cone… a mystery tree! What the maxipiñon has to say about genetic bottlenecking may unlock its secrets... MYSTERY SOLVED.

Listen anywhere you get your pods.

To get monthly botanical stickers delivered to your mailbox, join the Cone Club at the link in the bio

CONE OF THE MONTH: Loblolly pine (𝘗𝘪𝘯𝘶𝘴 𝘵𝘢𝘦𝘥𝘢) by@lamitchh We couldn't resist getting another illo from Lauren Mitchell,...
15/07/2025

CONE OF THE MONTH: Loblolly pine (𝘗𝘪𝘯𝘶𝘴 𝘵𝘢𝘦𝘥𝘢) by@lamitchh

We couldn't resist getting another illo from Lauren Mitchell, and this time we went with the loblolly pine! Do you want this sticker? Then join the CONE CLUB at the link in our bio! Support the pod and get monthly botanical stickers in return

NEW EPISODE: There's Always Money in the (Banana Tree)It’s a BANANZA with the banana (Musa acuminata), a fruit so popula...
03/07/2025

NEW EPISODE: There's Always Money in the (Banana Tree)

It’s a BANANZA with the banana (Musa acuminata), a fruit so popular that it helped shape the political landscape of the world.

Listen anywhere you get your pods!

THIS WEEK 🍌
01/07/2025

THIS WEEK 🍌

Cone of the Month: Mystery ConeWhat's up Fungal Associates! This month's supporter sticker is the incredible MYSTERY CON...
24/06/2025

Cone of the Month: Mystery Cone

What's up Fungal Associates! This month's supporter sticker is the incredible MYSTERY CONE. Why is it a mystery? Well, because we're not entirely sure what species is it. It was illustrated by the wildly talented .floripondia and looks precisely like the inspiration. But what species is it???

To get monthly botanical stickers sent to your mailbox, become a Treemium Member at the link in the bio.

Introducing... TROPICAL VACATION! 🌺 a series all about tropical trees!Our first visit is Brazil, where the ipê (𝘏𝘢𝘯𝘥𝘳𝘰𝘢𝘯...
19/06/2025

Introducing... TROPICAL VACATION! 🌺 a series all about tropical trees!

Our first visit is Brazil, where the ipê (𝘏𝘢𝘯𝘥𝘳𝘰𝘢𝘯𝘵𝘩𝘶𝘴 𝘪𝘮𝘱𝘦𝘵𝘪𝘨𝘪𝘯𝘰𝘴𝘢) reigns supreme. This tree has no shortage of strengths, quite literally! From decking to medicine, this tree has it all. Then, we play a special musical edition of The Slang Game.

Listen anywhere you get your pods!

NEW (LATE) EPISODE: Paperbark Maple (𝘈𝘤𝘦𝘳 𝘨𝘳𝘪𝘴𝘦𝘶𝘮)No, your Spotify isn't glitching, we are!Parthenowhatnow? Parthenocarp...
08/06/2025

NEW (LATE) EPISODE: Paperbark Maple (𝘈𝘤𝘦𝘳 𝘨𝘳𝘪𝘴𝘦𝘶𝘮)

No, your Spotify isn't glitching, we are!

Parthenowhatnow? Parthenocarpy! Why are 90% of the paperbark maple's (Acer griseum) infertile? Only nature knows.

Also pictured is the Saw & Boarder material we mentioned in this episode.

To get monthly botanical stickers and ad free listening, join the Cone Club (link in bio)!

Listen anywhere you get your pods.

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