Anomalous secondary growth! What in the world is it? Just ask the ombú (Phytolacca dioica), pokeweed’s tree-like cousin. It doesn’t make wood, it makes “anomalous secondary growth”, an endlessly interesting way to grow. Then, we answer a question about the perfect flower/tree pairings. Completely Arbortrary is produced and hosted by Casey Clapp and…

The Golden Ratio: a fact of life on Earth, or an copy and pasted alien blueprint? Perhaps the answer lies in the cones of the Austrian black pine (Pinus nigra). Let’s discuss Phyllotaxis, the mathematical means by which plants remain in light. Completely Arbortrary is produced and hosted by Casey Clapp and Alex Crowson Support the pod and become a …

What's up, Middle-Earthlings! Casey and I are taking a much-needed break this week, and so we present to you a hilariously massive extended edition episode that includes all three episodes of our Lord of the Tree Rings series, originally published in March of 2022. New episodes starting next week! Take care, everyone. Completely Arbortrary is produ…

What makes you happy? Is it money? Or maybe it’s the money tree (Pachira aquatica). This famous houseplant is also a forest tree, so why did it become synonymous with feng shui, harmonious qi, and interior design? Then we play a new game of Happy Go Lucky! Completely Arbortrary is produced and hosted by Casey Clapp and Alex Crowson Support the pod …

What makes trees weep? Perhaps the answer lies in the aptly named weeping cherry (Prunus x subhirtella 'Pendula'). Today we talk gravitropism and why some plants just have it backward. Then, we listen to you tree-themed Beatles covers and announce the winner of THE HAT! Completely Arbortrary is produced and hosted by Casey Clapp and Alex Crowson Su…

What makes you angry? Is it the Jeffrey pine (𝘗𝘪𝘯𝘶𝘴 𝘫𝘦𝘧𝘧𝘳𝘦𝘺𝘪)? Perhaps it’s the smell, a controversial topic among tree lovers that causes all sorts of anger. 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 add…

Why are we so afraid of the silver maple (Acer saccharinum)? Perhaps because of the risk involved. In today’s episode of Inside Sprout, we discuss tree risk assessment as we ask ourselves the question: if a tree falls, and no one is around to see it, is there any risk? Completely Arbortrary is produced and hosted by Casey Clapp and Alex Crowson Sup…

Welcome to Inside Sprout, a 5 part mini-series on trees that best embody and illicit our most basic human emotions. Today we start with disgust and the black locust (Robinia pseudoacacia). This tree is almost universally despised for its invasiveness, but has found a very important and loving niche for itself in the woodworking community. Completel…

Take me out to the ball game… the one where they bounce a solid rubber (Castilla elastica) ball between their hips. Today we take it way back for a discussion about rubber (the tree) and rubber (the substance) and an ancient ballgame that’s still played today. Completely Arbortrary is produced and hosted by Casey Clapp and Alex Crowson Support the …

The lightest wood there is, the balsa (Ochroma pyramidale) is one excited little kid. It grows fast, has ice cream cone flowers, and you can even carry it around on your shoulders! But what gives this tree the ability to grow in such a famous way? Completely Arbortrary is produced and hosted by Casey Clapp and Alex Crowson Support the pod and becom…

In the second part of our eco-feminism series, we discuss the Chipko movement, a practical manifestation of eco-feminist ideologies out of India. Author/activist Vandana Shiva makes an appearance, as does the Banj oak (Quercus leucotrichophora). Then, we play a medieval edition of the Slang Game. Completely Arbortrary is produced and hosted by Case…

What makes a tree innately "feminine"? We can't explain it, but we can roughly explain eco-feminism, and how it affects our opinions of, and behaviors toward, Mother Nature and the sitka spruce (Picea sitchensis). See Privacy Policy at https://art19.com/privacy and California Privacy Notice at https://art19.com/privacy#do-not-sell-my-info.…

Oh, what fun is the jaboticaba (Plinia cauliflora) with it’s curiously growing fruit. Learn about this tree before diving headlong into a discussion about temperate vs. tropical fruit! Who be will victorious? Then, we have not one but TWO taste tests! Completely Arbortrary is produced and hosted by Casey Clapp and Alex Crowson Support the pod and b…

The tree that walks! (not really) The walking palm (Socratea exorrhiza) is beloved by Tik-Tok clickbait content creators for its astounding ability to “walk”. But is its fame a double-edged sword? 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 …

ʻŌhiʻa Lehua (Metrosideros polymorpha) is Hawaii's most populous tree, and perhaps its most adaptable! For a tree that grows on literal lava flows, this tree has no shortage of interesting qualities that make it one of the most fascinating trees we've ever discussed! Completely Arbortrary is produced and hosted by Casey Clapp and Alex Crowson Suppo…

Happy 2025! Let’s start with a tree so out of time and place that it’s suffering the most endangered situation of any conifer in the world. Then, we play a game that teaches you how to avoid non-tree conversations. Welcome to Season 8. Completely Arbortrary is produced and hosted by Casey Clapp and Alex Crowson Support the pod and become a Treemium…

Today we whittle spoons alongside woodworking gem Justin Davies, and hear about Justin's dos-and-dont's while carving, how he got into the hobby, and where it's taking him next! 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…

Merry Christmas! Let’s gather ‘round the Moodjar (Nuytsia floribunda). But look out, this fascinating tree has a few quirks that make it an expert parasite. Then we play a game, The Mood Jar! See you 2025. Completely Arbortrary is produced and hosted by Casey Clapp and Alex Crowson Support the pod and become a Treemium Member Follow along on Instag…

Only two wise men showed up. But, good news: they brought frankincense (Boswellia sacra) and myrrh (Commiphora myrrha), two storied plants known for their seemingly endless beneficial properties and their role in the legend of the birth of Jesus. Completely Arbortrary is produced and hosted by Casey Clapp and Alex Crowson Support the pod and become…

The gumbo-limbo (Bursera simaruba) is living that hummock life, and loving every minute of it. This resiliant tree stays low to the ground and says “who cares” to hurricanes, making it a stalwart, understated addition to upland subtropical climes. Then we discuss what happens when billionaires want a better view. Completely Arbortrary is produced a…

In an episode heavy with rants and strong opinions, we discuss the yellow birch (Betula alleghaniensis). Leafblowers, giant earthworms, and birches all collide in this dense episode of Completely Arbortrary. Then, we answer a question about the most satisfying falling leaves. Completely Arbortrary is produced and hosted by Casey Clapp and Alex Crow…

Would you like a cup of tea? Try the gourd herb (Ilex paraguariensis), a tropical tree famous for its massive contribution to the world of drinkables. 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 …

Life goes on... and on... and on... for the curlleaf mountain-mahogany (Cercocarpus ledifolius). What can we learn from this long-lived, tough-as-nails tree? Then, we take a listener question about fallen trees! Completely Arbortrary is produced and hosted by Casey Clapp and Alex Crowson Support the pod and become a Treemium Member Follow along on …

In the second of our “odd Pine family distant cousins” we talk Keteleeria (Keteleeria davidiana), and the perfect pocket of China where this and many other species call home. 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 ou…

In this episode, we explore the golden-larch (Pseudolarix amabilis), a unique member of the pine family that feels a bit like the “weird cousin at the Pine family picnic.” Once native to the Arctic, this deciduous conifer now grows exclusively in specific regions of China, adapting over millennia to its new home. We also dive into a listener questi…

WARNING: This is not a mango. Do not eat this non-mango, this Lord of Lies, this Great Deceiver, for it is the sea-mango (Cerbera manghas) and it absolutely will kill you. The story is a little more complicated, however, as this tree provides an undeniably invaluable resource... but is it worth the risk? Completely Arbortrary is produced and hosted…

In this episode, we explore Australia’s infamous giant stinging tree (Dendrocnide moroides) and its neurotoxic hairs that cause agonizing pain. How fun(?)! 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 additi…

Join us as we get weird with the Boojum tree (Fouquieria columnaris), a quirky desert oddball with some fascinating parenchyma. Plus, Casey reads an interminably long Lewis Carroll poem that gave this tree its name. Completely Arbortrary is produced and hosted by Casey Clapp and Alex Crowson Support the pod and become a Treemium Member Follow along…

Join us on a mysterious journey through time to discuss the Munz oak (Quercus x munzii), a curious hybrid of UNKNOWN ORIGIN! 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 Cov…

Join us for an afternoon chat under this gorgeous Western sycamore (Platanus racemosa) and hear about what Casey and Alex and reflecting on lately. 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 rea…

Dam! Let’s talk about them, and about the China-fir (Cunninghamia lanceolata) and the ingenious agroforestry methods of the Kam people of China. 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 readin…

The Fabulous, Funny, Smart, and Warm woman we all love, ALIE WARD graces the podcast today. We can hardly believe it. Alie was a very important part of the early success of Completely Arbortrary and we forever admire her! Among many other job titles, Alie is the host and creator of Ologies! Please enjoy. Completely Arbortrary is produced and hosted…

“I’d rather see a smoketree than a tree smoking.” Enter the American smoketree (Cotinus obovatus), a beautiful little tree that was nearly used to extinction. 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 add…

Welcome to the Alternative Sex Experience, featuring the striped maple (Acer pensylvanicum). In our continued discussion on dioecy, this one takes a curiously sexual turn. 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 s…

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! 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 Arbort…

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! Completely Arbortrary is produced and hosted by Casey Clapp and Alex Crowson Support the pod and…

The Great Fire of 1910 greatly changed the (literal) landscape of northern Idaho, as well as the continent’s population of western white pine (Pinus monitcola). What followed was one of the most successful and dangerous marketing campaigns in US history. Completely Arbortrary is produced and hosted by Casey Clapp and Alex Crowson Support the pod an…

A fascinating tree with no shortage of fun facts, the Chinese-nutmeg (Torreya grandis) is a cornerstone of Chinese history and traditional medicine. And man, is it yummy (we think)! 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 merc…

We continue our plant-based diet with a giant of the culinary world, the tamarind (Tamarindus indica). Whether in chamoy or pad thai, this sweet pea is the darling of many a regional cuisine, worldwide! Completely Arbortrary is produced and hosted by Casey Clapp and Alex Crowson Support the pod and become a Treemium Member Follow along on Instagram…

You think ice cream grows on trees?! The ice-cream bean (Inga edulis) is one of nature’s greatest gifts to humanity. This agroforestry behemoth is South America’s fruity answer to sweet-toothed nature enthusiasts. And what is a fruit, anyway? Completely Arbortrary is produced and hosted by Casey Clapp and Alex Crowson Support the pod and become a T…

This is Plant-Based Diet: Part Chew, a new series from Completely Arbortrary all about trees that give us food! In this episode, we discuss the sapodilla (Manilkara zapota) a tree that gives us not one, but TWO delicious treats: fruit and gum. Completely Arbortrary is produced and hosted by Casey Clapp and Alex Crowson Support the pod and become a …

Did ants invent agriculture? Kind of, yes! Learn how in this itchy episode on South America’s own almécega (Protium heptaphyllum). 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 websi…

Hardship strikes the house of Arbortrary, so please enjoy this bonus episode all about our favorite process in nature, photosynthesis! 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 w…

No, it's not a Tree. But, it is a tree. The black tree fern has some incredible qualities, not least of which is the way it creates more ferns. Get ready to hear about some FREAKY stuff. 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…

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. Completely Arbortrary is produce…

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

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. 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 Arbor…

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. 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 …

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 …

After living a life of stem for the last 7 weeks, we need a break! So this week, you get a bonus episode: what is a leaf? In this episode from 2021 we discuss what a leaf is, how they grow, and some defining characteristics. To coincide with this bonus episode, we are expanding our CONE CLUB to include our very first--you guessed it--LEAF! The Bur …