Botany Episodes

Border wall contractors have destroyed three ancient Fremont cottonwoods in Lochiel, Arizona, to clear the way for two parallel 30-foot walls through the San Rafael Valley. One tree remains—and activists have established what may be the first tree sit opposing border wall construction. Kate Scott, co-founder of the Madrean Archipelago Wildlife Center, joins Chris Clarke from the protest camp at Lochiel. She describes the ecological and cultural importance of the cottonwoods, concerns about nesting migratory birds and archaeological resources, and the campaign to protect the surviving tree and prevent construction of the second wall.

Dive into the fascinating history and migration of the Joshua tree, the extinction of the Shasta ground sloth, and the impact of invasive species. Chris recounts stories from Cima, California, amidst tales of nature's transformation and personal change. Discover the challenges faced by desert ecosystems and the continuous efforts to protect them. With contributions from nature sound recordist Fred Bell, this episode encapsulates a blend of history, ecology, and introspection.

Desert biologist Tim Shields joins 90 Miles from Needles to discuss efforts to protect the Mojave Desert's tortoise population. Shields updates on using non-lethal lasers to deter ravens, major tortoise predators, and shares insights into the challenges posed by the invasive schismus grass. He reveals plans to restore native ecosystems using cutting-edge technologies, aiming to revive the desert's biodiversity. The conversation highlights innovative conservation strategies and Shields' dedication to preserving the desert environment for future generations.

Chris Clarke discusses the challenges facing Joshua trees and desert ecosystems with conservation biologist Nick Graver. They explore how climate change, invasive species, and increased human activity threaten these iconic landscapes. Graver, a graduate student at UC Riverside, shares insights on adapting land management strategies, the role of wildfires, and the importance of collaborative action across federal and state entities. As they discuss Graver's research on Joshua tree population modeling, they highlight the critical need for continued efforts to protect the desert's biodiversity for future generations.

Chris Clarke reflects on his first encounter with the North American deserts, sparked by a 1966 road trip with his father, James Clarke, who recently celebrated his 91st birthday. This episode revisits a previously shared piece by Chris exploring family ties, personal history, and the profound connection to nature through the lens of Joshua trees and their pollinators.

Chris Clarke and Brendan Cummings discuss the recent approval of the Western Joshua Tree Conservation Plan by California's Fish and Game Commission. Brendan outlines the journey from the 2019 petition for protection to the 2023 Conservation Act, highlighting its aim to combat climate threats and managed development impacts on Joshua trees.

Chris Clarke reflects on the fifth anniversary of the Dome Fire, which devastated over 44,000 acres of the Joshua Tree forest in the Mojave National Preserve. The episode explores themes of loss, recovery, and environmental impact, as Clarke recounts his personal connection to the area and its transformation post-fire.

This chapter of our 100th episode showcases poetry and prose, celebrating the Mojave and Amargosa regions' beauty and resilience. Cameron Mayer shares poetry on plants like the Honey Mesquite and Mojave Aster, exploring themes of nature's resilience and connection.

Explore urban environmental restoration at the Nature Center at Pia Okwai in South Salt Lake, guided by Parker Lloyd from the Tracy Aviary. Discover how this innovative project offers a sanctuary for native wildlife and a community haven amid industrial sprawl.

In this engaging episode of the "90 Miles from Needles: The Desert Protection Podcast," host Chris Clarke is joined by author Barret Baumgart. The conversation centers around Baumgart's book "Yuck," which explores the peculiar and iconic Joshua Tree. From its historical misunderstandings and numerous failed attempts to capitalize on the plant, to its symbolic resistance against commodification, the chat offers a fresh perspective on the interaction between humans and this resilient desert species.

Chris Clarke talks with botanist Naomi Fraga about Tiehm's buckwheat at Rhyolite Ridge and Tecopa bird's beak, exploring how rare endemic plants collide with lithium mining and rapid industrialization.

Chris Clarke talks with Sant Khalsa and Juniper Harrower about the book Desert Forest: Life with Joshua Trees, bringing together artists, writers, and scientists to explore Joshua-tree ecology and culture.

Desert plants often look timeless, and some nearly are. Chris Clarke explores the astonishing longevity of desert vegetation, from the roughly 11,700-year-old King Clone creosote ring to chollas and Mojave yuccas that can survive far longer than their appearance suggests. He also explains how researchers estimate plant ages when tree rings aren't available, using historical photographs, repeated observations, and long-term ecological studies. The result changes the way we see seemingly ordinary plants: some desert landscapes contain living organisms whose histories stretch back centuries or millennia.

What can Joshua trees teach us about family? Chris Clarke reads an excerpt from his book in progress about the Mojave Desert's signature plant, weaving natural history with personal memory and reflections on kinship. Through encounters with Joshua trees and the landscapes they inhabit, he considers relationships among plants, animals, people, and place—and challenges the idea that nature consists of isolated individuals rather than communities of interconnected lives.

The saguaro cactus is an enduring symbol of the American Southwest, yet its life story is even more remarkable than its silhouette. This episode explores the biology, ecology, and cultural significance of the Sonoran Desert's iconic giant, revealing how saguaros support countless other species throughout their centuries-long lives.

Every spring, brilliant orange globemallow flowers brighten the desert landscape, but their importance goes far beyond their beauty. Learn about one of the Southwest's most recognizable native wildflowers, its role in supporting pollinators and wildlife, and the ways native plants help desert ecosystems recover and thrive.

A desert superbloom is one of nature's most spectacular events, transforming dry landscapes into seas of wildflowers after the right combination of rain and temperature. This episode explores what causes these rare displays, why they don't happen every wet year, and how visitors can experience a superbloom while helping protect the fragile habitats that make it possible.

The creosote bush is so common across the Southwest that it's easy to overlook—but it may be the single most important plant in North American deserts. This episode explores the biology, ecology, and remarkable adaptations of Larrea tridentata, from its ancient clones to its role in supporting wildlife and shaping entire desert ecosystems. You'll never look at a creosote flat the same way again.

Ironwood trees are among the ecological giants of the Sonoran Desert, supporting hundreds of species while helping entire ecosystems flourish. In the Season 1 finale, we celebrate this extraordinary tree, explore its biology and importance, and reflect on the first year of 90 Miles from Needles with thanks to the listeners who made it possible.

The debate over protecting California's western Joshua tree continued long after the initial proposal for legal protection. This episode provides an update on the political and scientific discussions surrounding the species and explains why decisions made today will shape the future of one of the Mojave Desert's defining plants.

At a demonstration in the Nevada Mojave, environmental advocate Shannon Salter discussed the growing pressures facing the desert Southwest and the campaigns working to protect public lands and wildlife. Together we explore grassroots organizing, effective advocacy, and why individual voices continue to make a difference.

Bristlecone pines are among the oldest living organisms on Earth, surviving for thousands of years in some of the harshest environments imaginable. This episode pairs their extraordinary story and new threats to the trees with a reflection on resilience, asking what keeps people motivated to continue protecting the desert even when progress feels slow.

Mesquite, palo verde, and ironwood are often called the bean trees of the desert, providing food, shelter, and stability for countless other species. This episode explores the remarkable ecology of these legumes while also sharing how listeners can support independent desert journalism and conservation.

The western Joshua tree has become the center of one of California's most recognizable conservation battles. This episode explores the threats facing this iconic species, the debate over legal protections, and why the future of the Joshua tree is closely tied to the changing climate of the Mojave Desert.