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.

LINK IN BIO FOR THE 2025 HOLIDAY MERCH PRESALE!
11/11/2025

LINK IN BIO FOR THE 2025 HOLIDAY MERCH PRESALE!

NOVEMBER CONE OF THE MONTH: the Norway spruce by Become a Cone Club member to get monthly botanical stickers sent to yo...
11/11/2025

NOVEMBER CONE OF THE MONTH: the Norway spruce by

Become a Cone Club member to get monthly botanical stickers sent to your mailbox 💌🌲

06/11/2025

NEW EPISODE: Goin' Thig Mode (Fraser Fir)

The boys are joined by their first ever third host to discuss goin' thig mode with thigmomorphogenesis and the Fraser fir (Abies fraseri). Then, a test of Casey's binomial spelling skills with The Spelling Tree.

Listen anywhere you get your pods 🎧

TOMORROW 🧛🏻
15/10/2025

TOMORROW 🧛🏻

NEW EPISODE - Maracuya (AKA Passionfruit)Are you passionate for the fruit? The fruit that serves itself, maracuya (passi...
25/09/2025

NEW EPISODE - Maracuya (AKA Passionfruit)

Are you passionate for the fruit? The fruit that serves itself, maracuya (passionfruit) and the pavlova have very interesting backgrounds involving the passion of the Christ, Andeans, and Russian ballerinas.

Listen anywhere you get your pods!

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

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