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 htt...
Jan 22, 2026•1 hr 1 min•Ep. 161
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 Priv...
Jan 15, 2026•1 hr 26 min•Ep. 160
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 Californ...
Jan 08, 2026•1 hr 11 min•Ep. 159
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 .
Jan 01, 2026•51 min•Ep. 158
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 additiona...
Dec 25, 2025•1 hr 17 min•Ep. 157
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 an...
Dec 18, 2025•1 hr 18 min•Ep. 156
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 P...
Dec 11, 2025•1 hr 15 min•Ep. 155
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 Pri...
Dec 04, 2025•1 hr•Ep. 154
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 Ca...
Nov 27, 2025•1 hr 11 min•Ep. 153
As the boys take a much needed break from the wild world of modern podcasting, they present to you the audio from a 2023 livestream entitled Fungus in the Fall. 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 ...
Nov 20, 2025•1 hr 10 min•Ep. 152
So many junipers, so little time. So let’s pick one! How about the weeping juniper ( Juniperus flaccida )? Buckle up, it’s gonna be a bumpy one. 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 Priva...
Nov 13, 2025•1 hr•Ep. 151
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. 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...
Nov 06, 2025•1 hr 5 min•Ep. 150
BEEware of the bigleaf magnolia ( Magnolia macrophylla ). This tree made such a strong alliance with beetles, that any other insect trying to get in gets KILLED. Then we play a Halloween edition of Family Tree! 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 Se...
Oct 30, 2025•1 hr 10 min•Ep. 149
DO NOT TOUCH this week’s tree ( Hippomane mancinella ), it makes horses go crazy! 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 ....
Oct 23, 2025•58 min•Ep. 148
We need a tall, straight, decay-resistant, fragrant wood… call THE COFFINTREE ( Taiwania cryptomerioides ). Why has this tree been used consistently for coffin wood?…. Nobody knows (including us!). 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 Pol...
Oct 16, 2025•52 min•Ep. 147
Out of the black tea lagoon comes a swamp monster! It’s the swamp tupelo ( Nyssa biflora )—swollen butt and all—who has learned how to breathe… underwater. 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 Calif...
Oct 09, 2025•1 hr 13 min•Ep. 146
What if your left foot was in charge of keeping your left hand alive? What if your right big toe was responsible for the right ear? With sectored architecture, the future is now! (Actually, it's about 2000 years ago). Join us for a discussion of the Rocky Mountain bristlecone pine ( Pinus aristata ) and remember to use coupon code BLOWOUT for 30% off everything at arbortrarypod.com/merch Completely Arbortrary is produced and hosted by Casey Clapp and Alex Crowson Support the pod and become a Tre...
Oct 02, 2025•1 hr 4 min•Ep. 145
The maracuya, the passionfruit, the fruit that serves itself ( Passiflora lindeniana ) produces one of the best fruits in the world (unbiased opinion), which lends its flavor to one of the best desserts in the world (unbiased opinion). 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 Ave...
Sep 25, 2025•1 hr 19 min•Ep. 144
Did you save room for dessert? We're having zwetschgenkuchen, or German plum cake, made with the European plum ( Prunus domestica ). 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...
Sep 18, 2025•1 hr 7 min•Ep. 143
Asian pear ( Pyrus pyrifolia ) is the centerpiece of a Korean dish called baesuk; a dessert even Frankenstein would love. 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://ar...
Sep 11, 2025•1 hr 6 min•Ep. 142
It's Plant Based Diet: Just Desserts, where we talk about 4 of the world's sweetest trees. First up, the pistachio! ( Pistacia vera ) Hear all about its origins in the Middle East and the dessert that made it famous: baklava. 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 ...
Sep 04, 2025•1 hr 7 min•Ep. 141
Buzz buzz! Let’s connect some pollen the new fashioned way with the Bigberry Manzanita ( Arctostaphylos glauca ). 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/...
Aug 28, 2025•1 hr 4 min•Ep. 140
What's up Fungal Associates!? This week we have part 2 of our bonus episode fortnight and bring you "What is Bark?" Which asks the question.... well, what is bark? We'll see you next week with new episodes! See Privacy Policy at https://art19.com/privacy and California Privacy Notice at https://art19.com/privacy#do-not-sell-my-info .
Aug 21, 2025•45 min•Ep. 139
What's up Fungal Associates! For the next two weeks we bring you some OLD SCHOOL bonus episodes (circa 2021). Why? Well, because Casey took a frisbee to the throat, and Alex took a vacation to Hawaii. Classic! Enjoy this break as I know we will <3 See Privacy Policy at https://art19.com/privacy and California Privacy Notice at https://art19.com/privacy#do-not-sell-my-info .
Aug 14, 2025•54 min•Ep. 138
I think, therefore I am... a tree - American Beech ( Fagus grandifolia ) 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 ....
Aug 07, 2025•1 hr 17 min•Ep. 137
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. 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 h...
Jul 31, 2025•1 hr 5 min•Ep. 136
Don't go chokin' on this cherry ( Prunus virginiana ) or else you may turn red! And Canadian! 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-...
Jul 24, 2025•1 hr 3 min•Ep. 135
A mystery cone… a mystery tree! What the maxipiñon has to say about genetic bottlenecking may unlock its secrets! 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/...
Jul 17, 2025•54 min•Ep. 134
What happens when trees have to run for their lives and the only way is up? The Vietnam cypress ( Xanthocyparis vietnamensis ), that's what! 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 N...
Jul 10, 2025•53 min•Ep. 133
It’s a BANANZA with the banana ( Musa acuminata) , a fruit so popular that it helped shape the political landscape of 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 htt...
Jul 03, 2025•1 hr 19 min•Ep. 132
