It’s beginning to look a lot like… an invasive pokey nightmare, with the English holly (Ilex aquafolium). Learn all about dioeciousness, and what makes this hot new sexual fad so successful!

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Just another arborvitae, the Leyland cypress (Cupressus × leylandii et al) has to be one of the most deplorable species we’ve investigated on Completely Arbortrary. Learn all about this tree’s poorest qualities, then join us for a segment of Slang Game!

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About 1600 years ago, a group of refugees settled on a mucky swath of land that would one day be known as Venice. What followed is one of the greatest marvels of human engineering: a city built entirely on trees in water. Enter European alder (Alnus glutinosa), an ordinary tree with an extraordinary role in history.

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Last week we talked about a tree that has a unique--and deadly--relationship with birds. This week, the script is flipped and we hear about a bird that uses a tree to accomplish it gruesome agenda: the thorn mimosa (Vachellia nilotica).

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What happens when a temporary tattoo becomes permanent, and makes you permanently DEAD?! We find out in our most macabre episode yet coving the bird-catcher tree (Pisonia grandis). Join us this week as discuss this tree's unique means of spreading its seeds, and the dark repercussions.

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This week we present to you a case for and against the sweetgum (Liquidambar styraciflua). A tree that is lauded by some and loathed by others, we take sides and present the merits and demerits of the subject tree and leave it for you to decide its fate. Which side will you choose?

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Due to a host of circumstances, our regularly scheduled programming has been postponed to next week! HOWEVER, we're taking this opportunity to tell you all about our Patreon revamp! And to share a Patreon episode - What is Phenology! We hope you enjoy it and we'll see you next week with the Sweetgum!

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Close your eyes and imagine a maple leaf. What is it that defines the quintessential maple leaf? Well today, we chat about the bigleaf maple (Acer macrophyllum) and dive into how that standard image of a maple leaf is as accurate as you may think. Then we chat about the biggest news of the day with another edition of the Fungal Associated Press.

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A tree that has made no enemies, a tree that doesn't rock the boat, today's tree is the Canadian serviceberry, also knowns as the shad-blow, the shadbush, the bilberry, the juneberry (Amelanchier canadensis). This episode we have a classic fireside chat about this tree that has something for everyone, and on top of that we collaborated with Amanda Spinosa on a delicious recipe to show off the fruit of this wacky little tree.

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Alex and Casey go on a walkabout in the Overlook neighborhood of Portland to gander at some of the city's most gorgeous arboreal specimens.

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Today's story has us wondering who's the real victim. The Indian sandalwood (Santalum album) is a tree that has been used for millennia for cultural practices across the world, but it's also a tree that has its fair share of using other organisms for its own purposes.

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The grand finale in our symbiosis 4 Act play. In this special episode of Completely Arbortrary, we discuss the much beloved Whitebark pine (Pinus albicaulis). We’re joined by Peri Sasnett from the Glacier National Park Headwaters podcast to discuss where these trees are and where they’re headed.

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In our penultimate episode about the topic, we explore symbiosis across kingdoms, and dive into the relationship between the trumpet tree (Cercopia obtusifolia) and its evolutionary partners, Azteca ants. Then we reveal a new game!

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In this bonus episode, hear all about how Casey became Casey. His schooling, career trajectory, and the fated beginning of Completely Arbortrary.

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What happens when the guy who makes you pizza moves in and makes you pizza in your own kitchen--forever? Today, we get at that question and how it relates to cells in cells in cells in a tree that looks like parasols in parasols in parasols, the Japanese umbrella-pine (Sciadopitys verticillata). Buckle up.

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How many characters can one introduce in one episode? Today we find out. The Andean alder (Alnus acuminata) takes us on a journey through time and space as we take on our first foray into a series dedicated to symbiosis and all its manifestations.

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What does the purpleleaf plum (Prunus cerasifera 'Thundercloud') represent for you? For Casey and Alex, it's the suburbs, and boy do they despise it. This week, we get a little snippet of American History and hear about how the suburbs came to be, and how this tree has come to represent them in the worst way.

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There are more than 20 species of Polylepis shrubs and trees. At the highest altitudes (upwards of 16,000 feet, they grow as small shrubs. Lower, they can grow up 120 feet. So this forest is a bit unique, and we need to get to the bottom of it: IS it a forest? Or is it a shrubland? When does it become such?

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Should Man hold dominion over nature? And where did this idea come from? What got us in our current environmental mess in the first place. Today we talk the Judas Tree (Cercis siliquastrum) and tackle some BIG picture stuff too.

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A tree that truly grows its own way, the Pacific madrone (Arbutus menziesii) is a prolific grower and a gorgeous shower. Listen along as we discuss this curious beauty and the special place it’s found in the world.

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Can a tree help you be smarter? This week we dive into that question and discuss how air pollution effects our brains, and how trees can help keep us operating at our top level. After our rating, we head LIVE to the Grand Finale of the Tournament of Champion Trees with Tobin Mitnick (@jewslovetrees).

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This week we have our work cut out for us. The black cottonwood (Populus trichocarpa) is our tree of topic, and there's no getting around it: it's an emotional roller coaster that pulls us in every direction at once. Listen in and make your own opinions on this complicated tree, and stick around for the second round of the Tournament of Champion Trees, with Tobin Mitnik as our guest.

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Join us this week where the trees have no name. But this one does! It’s Joshua! Learn all about yuccas on our last of three monocotic adventures.

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Our quest to further define "tree" continues with the STUNNING Socotra Dragon Blood Tree (Dracaena cinnabari). We talk all about this unique, altruistic "tree" and all the curious strategies it takes to get where it's going. Then we answer a question about tree albinoism!

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Sorry, it’s a fir thing. The white fir (Abies concolor) is no simple tree. It’s a part of broader complex of trees. What does this mean for in the context of its taxonomy? Well… it’s complex.

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What exactly isn't a tree? This week we cover the other side of the controversy coin with a discussion on the Chinese windmill palm (Trachycarpus fortunei). We get into the thick of it and find out just what a palm is if it's not a "tree".

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One of the biggest trees around, the tuliptree is an ancient species and a champion of the people. Learn all about the arbitrary intricacies of measuring Champion Trees and select who you think will make it to the end!

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The fruit that went ‘round the world, and the fruit that we both like the best, this week we are covering the peach tree (Prunus persica). However, we go one step further and Casey tries to convince Alex that it's not just the peach, but everything like a peach that reigns supreme in a world full of fruit!

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A fruit tree that has been in all the right places with all the right stuff, the pawpaw (Asimina triloba) is a folk hero among fruits. But that's not all to the story. This week we chat about the pawpaw and it's slow, methodical march to success from the tropics to Canada.

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What is a penny worth? This is the philosophical question we grapple with today as we debate the merits of the dogwood (Cornus spp.). This episode is a little different than our normal shows because we're covering three different dogwoods all at once, but we assure you that's not where the controversy ends.

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A cosmopolitan tree that has humble roots, the white mulberry (Morus alba) has been transported across the world to support our insatiable appetite for silk. This week we discuss this relationship and how it's brought both the worms and the trees to every corner of the globe.

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This week we chat about the famous southern live oak (Quercus virginiana) of the southeastern United States. A tree that has had many different identities, we discuss how this tree was the base of naval power during the height of colonialism and beyond, and how it's both gorgeous yet also fraught with imagery of a sordid past.

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On this BONUS EPISODE, we sit down with Lizzie Falconer and Jen Thomas from the podcast Shorts. to discuss the Ursula K. Le Guin short story Direction of the Road. Find Lizzie and Jen's podcast at shortsthepodcast.com or any your podcast platform of choice!

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The Lord of the Tree Rings comes to a flashy finish with the Japanese stewartia (Stewartia pseudocamellia). This week we chat about all things specimen trees! Then we round off the saga with some tree lore from Alex.

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This week we march on through Middle-earth, our path leading us to the Norway spruce (Picea abies) and into the Fangorn Forest, found on Vanilla-earth as the Białowieża Forest (bee-ah-wo-vee-EDGE-ah). Join us as we ruminate about forest management and what it means to preserve a forest. Then we play a family favorite game!

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A tower of clouds in the forests of Chile, and the center of a dendrochronological scandal, the Alerce (Fitzroya cupressoides) is a monolithic beauty and officially the giant sequoia of the south.

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The world is changed... In our first installment of The Lord of the Tree Rings trilogy, we discuss the pedunculate oak (Quercus robur) and take a deep dive into how we take care of trees as they enter their geriatric years, and the differences between American and European tree care. Then Alex has Casey solve a series of riddles... The Fellowship assembles.

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Do trees even exist, man? This week we finish our second part on the "idea" of taxonomy and we dive into this question using the beautiful, rugged, southern catalpa (Catalpa bignonioides) as our guide. Come with us on this most pendantic of journeys.

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How do you see the world? How do you organize the world, all the plants and animals around you? This week we have a discussion about taxonomy that revolves around the gorgeous Italian cypress (Cupressus sempervirens), and it opens a door to an entirely new way to see the world.

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Does competition or cooperation get you further in life? That's the question we tackle this week while we discuss the paper birch (Betula papyrifera). We end this episode with a game that we all love, and get some ideas on how to love the trees in your neighborhood.

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The Rocky Mountain juniper (Juniperus scopulorum), like nearly all junipers, is a conifer that took a different strategy to get its seeds dispersed. This week we chat about convergent evolution, and how nature can find the same solutions to problems in very different ways.

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What can't this tree do? The coast redwood (Sequoia sempervirens) rounds off our two-part series on the oft-confused redwoods of California. This week we celebrate this tree and all that it is, then Alex finds himself in Jeopardy.

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What does it take to be a perfect tree? We'll come to figuring it out this week as we dive into a flowing conversation about the giant sequoia (Sequoiadendron giganteum). Stick around for a discussion that explores everything about these trees, and then looks into where the term tree even comes from.

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The hickories (Carya) are a part of an ancient forest system that once existed across the entire northern hemisphere, from North America to Europe, across Asia to the Pacific and back again to the North America. This week, we chat about the shagbark hickory (Carya ovata) and discuss how it and it's closest relatives have been so successful, yet ended up so far from kin across the world.

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Music by Aves and The Mini-Vandals

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The English yew (Taxus baccata) is one of our most storied, mythological, and metaphorical trees to date. Death, disease, toxicity, warfare... it has it all! Listen along as we discuss this poisonous protector of the dead. All hail Hecate!

Completely Arbortrary is produced and hosted by Casey Clapp and Alex Crowson

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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.

What do you do when the way of life that you evolved over millions of years was rendered useless in the blink of an eye? Something very similar to that happened to the Osage-orange (Maclura pomifera) at the end of the Pleistocene epoch, and it wasn't alone.

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.

What happens when good trees go bad? You get the laurel oak (Quercus laurifolia), a suitable template oak with a bad habit. Living in the wild, this tree does its thing as well as it can, but this Midnight Cowboy wasn't cut out for the big city.

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.

Has the European beech (Fagus sylvatica) been man's best friend since time-immemorial, or has it just been doing it best to impress the whole time? This week we discuss the complex history of the European beech, but the jury is still out if it's a natural history or unnatural.

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.

The King of Bonsai, this week we're welcoming the new Unseason of Completely Arbortrary with a discussion of the Japanese black pine (Pinus thunbergii). This tree has been cultivated for thousands of years as bonsai trees, and this week we chat about what Casey and Alex think of these trees and the art form they helped create.

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.

Enjoy this BONUS EPISODE from our Patreon as a palette cleanser to this season of food trees, in which we discuss three drinks from non-tree plants; coffee, hops, and grapes.

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.