Completely Arbortrary

By Completely Arbortrary

Tree advocate Casey Clapp and his tree-curious friend Alex Crowson bring you a podcast about trees and other related topics. History, culture, art, religion, science... trees affect and are affecte

... more

4.8

12371,237 ratings

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FAQs about Completely Arbortrary:

How many episodes does Completely Arbortrary have?

The podcast currently has 269 episodes available.

Completely Arbortrary episodes:

January 29, 2026 Cones on the Spectrum (Celerytop-Pine)
Forget everything you thought you knew about conifers, and make way for the celerytop-pine (Phyllocladus aspleniifolius) with leaves and cones like no other, and raises the question “what is a conifer”?
Completely Arbortrary is produced and hosted by Casey Clapp and Alex Crowson
Support the pod and become a Treemium Member
Follow along on Instagram
Find Arbortrary merch on our store
Find additional reading on our website
Cover art by Jillian Barthold
Music by Aves and The Mini-Vandals
See Privacy Policy at https://art19.com/privacy and California Privacy Notice at https://art19.com/privacy#do-not-sell-my-info.
...more
1h 20min
January 22, 2026 Evolutionary Naïveté (Blue Ash)
When the emerald ash borer came to North America, few ashes survived. But one native species, the blue ash (Fraxinus quadrangulata), survived. How did this lucky survivor beat the odds?
Completely Arbortrary is produced and hosted by Casey Clapp and Alex Crowson
Support the pod and become a Treemium Member
Follow along on Instagram
Find Arbortrary merch on our store
Find additional reading on our website
Cover art by Jillian Barthold
Music by Aves and The Mini-Vandals
See Privacy Policy at https://art19.com/privacy and California Privacy Notice at https://art19.com/privacy#do-not-sell-my-info.
...more
1h 1min
January 15, 2026 Bird Influence (Limber Pine)
Today we discuss our flexible friend the limber pine (Pinus flexilis) and its curious co-evolutionary relationship with, you guessed it, BIRDS.
Completely Arbortrary is produced and hosted by Casey Clapp and Alex Crowson
Support the pod and become a Treemium Member
Follow along on Instagram
Find Arbortrary merch on our store
Find additional reading on our website
Cover art by Jillian Barthold
Music by Aves and The Mini-Vandals
See Privacy Policy at https://art19.com/privacy and California Privacy Notice at https://art19.com/privacy#do-not-sell-my-info.
...more
1h 27min
January 08, 2026 Burning Hot Fresh Root News (Scots Pine)
Welcome to Season X of Completely Arbortrary, our final hoorah! To begin the end, we talk about senses of smell and the Scots pine (Pinus sylvestris).
Completely Arbortrary is produced and hosted by Casey Clapp and Alex Crowson
Support the pod and become a Treemium Member
Follow along on Instagram
Find Arbortrary merch on our store
Find additional reading on our website
Cover art by Jillian Barthold
Music by Aves and The Mini-Vandals
See Privacy Policy at https://art19.com/privacy and California Privacy Notice at https://art19.com/privacy#do-not-sell-my-info.
...more
1h 11min
January 01, 2026 It's The End of Completely Arbortrary (As We Know It)
It's been 5 years of weekly tree podcasts, but after this final season, Casey and Alex will be moseying on to the next chapter for an extended hiatus. Buckle up for THE FINAL SEASON of Completely Arbortrary.
See Privacy Policy at https://art19.com/privacy and California Privacy Notice at https://art19.com/privacy#do-not-sell-my-info.
...more
51min
December 25, 2025 How Water Moves Through Trees (Oyster Bay-Pine)
Turgor pressure, negative pressure, vessels and tracheids, embolisms… It’s a fact-packed Christmas Day episode of Completely Arbortrary, featuring the Oyster Bay-pine (Callitris rhomboidea). This drought tolerant tree has a surprising mechanism for keeping its water closely guarded. Merry Christmas!
Completely Arbortrary is produced and hosted by Casey Clapp and Alex Crowson
Support the pod and become a Treemium Member
Follow along on Instagram
Find Arbortrary merch on our store
Find additional reading on our website
Cover art by Jillian Barthold
Music by Aves and The Mini-Vandals
See Privacy Policy at https://art19.com/privacy and California Privacy Notice at https://art19.com/privacy#do-not-sell-my-info.
...more
1h 18min
December 18, 2025 Underplanted, Underrated, Underappreciated (Japanese Pagodatree)
Underrated, underplanted, underappreciated… so why isn’t the Japanese pagodatree (Styphnolobium japonicum) a more popular as a street tree in our urban forests?
Completely Arbortrary is produced and hosted by Casey Clapp and Alex Crowson
Support the pod and become a Treemium Member
Follow along on Instagram
Find Arbortrary merch on our store
Find additional reading on our website
Cover art by Jillian Barthold
Music by Aves and The Mini-Vandals
See Privacy Policy at https://art19.com/privacy and California Privacy Notice at https://art19.com/privacy#do-not-sell-my-info.
...more
1h 19min
December 11, 2025 Ivory & (Ebony)
work together in perfect harmony (guitar reference). Today, learn all about the ebony (Diospyros ebenum), it's typical path through capitalism, and the guitar luthier who gave it back to the world.
Completely Arbortrary is produced and hosted by Casey Clapp and Alex Crowson
Support the pod and become a Treemium Member
Follow along on Instagram
Find Arbortrary merch on our store
Find additional reading on our website
Cover art by Jillian Barthold
Music by Aves and The Mini-Vandals
See Privacy Policy at https://art19.com/privacy and California Privacy Notice at https://art19.com/privacy#do-not-sell-my-info.
...more
1h 15min
December 04, 2025 The Odysseed (Lotus Tree)
Hop aboard the good ship Odyssey to make for the island of the lotus tree (Diospyros lotus). But, could this be a case of mistaken idenitree?...

Completely Arbortrary is produced and hosted by Casey Clapp and Alex Crowson
Support the pod and become a Treemium Member
Follow along on Instagram
Find Arbortrary merch on our store
Find additional reading on our website
Cover art by Jillian Barthold
Music by Aves and The Mini-Vandals
See Privacy Policy at https://art19.com/privacy and California Privacy Notice at https://art19.com/privacy#do-not-sell-my-info.
...more
1h 1min
November 27, 2025 Holiday Merch Sale + Urban Trees and Racism
As we take a quick break we're here to remind you that our holiday merch sale ends ON BLACK FRIDAY, and reintroduce you to our talk on urban trees and racism.

Completely Arbortrary is produced and hosted by Casey Clapp and Alex Crowson
Support the pod and become a Treemium Member
Follow along on Instagram
Find Arbortrary merch on our store
Find additional reading on our website
Cover art by Jillian Barthold
Music by Aves and The Mini-Vandals
See Privacy Policy at https://art19.com/privacy and California Privacy Notice at https://art19.com/privacy#do-not-sell-my-info.
...more
1h 12min

FAQs about Completely Arbortrary:

How many episodes does Completely Arbortrary have?

The podcast currently has 269 episodes available.

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