4.8 • 1.2K Ratings
🗓️ 25 December 2025
⏱️ 82 minutes
🧾️ Download transcript
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
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Cover art by Jillian Barthold
Music by Aves and The Mini-Vandals
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| 0:00.0 | Hey everybody, Casey here. This is our fifth year making completely arbitrary. And to celebrate our |
| 0:06.8 | cone of the month for this month, December 2025, is actually five cones. That's right. We're making a |
| 0:14.1 | sticker sheet with five individual cones on it, one from every year we've been making this show. |
| 0:20.1 | And we want you to get them, which means |
| 0:22.0 | now is the best time to support the podcast at arbitrarypod.com. But we're not just leaving |
| 0:27.8 | into that. Right now, 760 of our dearest fungal associates are supporting the pod as |
| 0:33.1 | Tremium members. If we get to 800 subscribers by the end of 2025, then we're giving everyone a bonus sticker. |
| 0:42.2 | That's right. Every single supporter, regardless of the tier you're signed up for, if we get to 800, |
| 0:47.9 | everyone gets a bonus sticker. Now, to sweeten the deal even more, if you sign up now, this month only, |
| 0:53.4 | you'll get 15% off your first three months at either |
| 0:57.1 | support tier. |
| 0:58.0 | And if you're currently a subscriber at the tree hugger level and you want that sticker sheet, |
| 1:02.0 | you can get 15% off your first three months if you upgrade to the cone club. |
| 1:06.5 | So go over to arbitrary pod. |
| 1:07.9 | dot supercast.com and become a tremium member today or give it as a gift |
| 1:13.2 | to that tree lover in your life. Help us celebrate five years of completely arbitrary today. And thank you |
| 1:19.1 | so much. What's up, fungal associates?? Merry Christmas and welcome to completely arbitrary. |
| 1:30.1 | This is the podcast about trees and other related topics. |
| 1:32.7 | My name is Alex Crofton and I am one of your hosts. |
| 1:36.1 | And over there on the Big Green Couch, Casey Kla. |
| 1:40.8 | That's me. |
| 1:42.6 | Your pause was too long. |
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