Stuff To Blow Your Mind The Saguaro, Part 2
Mar 24, 2026
A deep dive into the biology and lifecycle of the saguaro cactus. They explore pollination, seed production, and the brutal odds for seedlings. Listeners hear about nurse plants, root strategies, CAM photosynthesis, and how saguaros store water and time their growth. The conversation also covers regional differences, causes of mortality, and vivid descriptions of decline.
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Seeing Saguaros Everywhere Around Phoenix
- Robert Lamb recounts seeing saguaros everywhere around Phoenix and on hikes.
- He noticed tiny seedlings through to giants, ribs and skeletons, describing how common and hypnotic they are in the landscape.
Night Blooming Flowers Evolved For Bats
- Saguaro flowers open at night and evolved for nocturnal pollinators like nectar-feeding bats and hawk moths.
- In northern populations beyond bat range, daytime pollinators (bees and doves) take over, reducing genetic diversity.
Minor Injuries Can Trigger Deadly Infections
- Small mechanical injuries make saguaros vulnerable to fatal infections despite size and spines.
- Constant rubbing from branches or abrasions can introduce bacteria/fungi that lead to rot and rapid decline.
