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.

It's the End of Completely Arbortrary (As We Know It)Several hundred tree podcast episodes later, we've reached the fina...
01/01/2026

It's the End of Completely Arbortrary (As We Know It)

Several hundred tree podcast episodes later, we've reached the final season of Completely Arbortrary. It's a bittersweet moment for Casey and I; bitter because this is our baby and moving on from it feels like losing a part of ourselves, and sweet because we're both ready for our next chapters. Three more months of Arbortrary! Details in this week's episode ♥️

We will make sure to express this ten-fold, but we literally would not have been able to do ANY of this without your support. If you've ever listened, recommended, bought merch, joined the cone club... you've been crucial to our work. Thank you, thank you, thank you 🫂🍄

WE HAVE GREETING CARDS! 👋 Link in bio Greetings! Have you ever wanted to send the plant lover in your life a thank you, ...
11/12/2025

WE HAVE GREETING CARDS! 👋 Link in bio

Greetings! Have you ever wanted to send the plant lover in your life a thank you, a congratulations, or a condolences, but couldn't express yourself without beautiful art of conifer cones? Boy, do we have a surprise for you: Arbortrary Greeting Cards! LINK IN BIO.

19/11/2025

It's the Holiday 2025 Merch Presale from Completely Arbortrary! LINK IN BIO

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!

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