Blackbrush, Coleogyne ramosissima, is easy to overlook. It’s tiny, dark leaves and gray stems can make a stretch of landscape look at best boring, at worst funereal. But this rose family plant’s low, dense canopy helps shape desert plant communities, and gives desert animals an important food source. Nurse plants shelter vulnerable seedlings from heat, drying winds, and hungry animals. Blackbrush may well be the most important nurse plant for Joshua trees.

Long-lived adults, episodic seed production, rodent seed caches, and suppressed young plants help blackbrush stands persist. But blackbrush isn’t well adapted to what North America’s hot deserts have become. Research in the Panamint Mountains shows why rebuilding a mature desert shrub community can take far longer than replacing its individual plants.

Protecting existing blackbrush matters as warming and disturbance make natural recovery harder.

Also, you still have a few days left to apply for our Fellowship for Desert Reporting, viewable at https://thedamn.org/fellowship.

Sources cited, plus extras:

• Webb, R. H., Steiger, J. W., & Turner, R. M. (1987). Dynamics of Mojave Desert Shrub Assemblages in the Panamint Mountains, California. Ecology, 68(3), 478–490. The exceptionally slow recovery of blackbrush communities after disturbance, including the climatic and geomorphic stability quotation. Free PDF. pubs.usgs.gov
• Hunter, K. L., & McAuliffe, J. R. (1994). Elevational Shifts of Coleogyne ramossissima in the Mojave Desert during the Little Ice Age. Quaternary Research, 42(2), 216–221. Packrat midden evidence for blackbrush expansion at the southern Nevada study site during the Little Ice Age. The extra “s” in ramossissima appears in the published title. Cambridge Core
• Meyer, S. E. (2023). Factors Regulating Population Stand Structure in Blackbrush (Coleogyne ramosissima: Rosaceae), a Masting North American Desert Shrub. Diversity, 15(5), 619. Stand structure, episodic seed crops, rodent dispersal, and banks of suppressed young plants within adult crowns. mdpi.com
• Pendleton, B. K., & Meyer, S. E. (2004). Habitat-correlated variation in blackbrush (Coleogyne ramosissima: Rosaceae) seed germination response. Journal of Arid Environments, 59(2), 229–243. Differences among populations in seed chilling requirements and germination responses. . ScienceDirect
• Jones, L. C., Schwinning, S., & Esque, T. C. (2014). Seedling ecology and restoration of blackbrush (Coleogyne ramosissima) in the Mojave Desert, United States. Restoration Ecology, 22(5), 692–700. Seedling establishment, herbivory, and how nurse-plant effects change with elevation and environmental stress.

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• we realized that our continent's easternmost desert, the Chihuahuan Desert, is not as well known in many ways as its sister deserts like the Mojave and Sonoran. And we had to do what we can to rectify that! So in this episode, Chris chats with Dr. Kevin Floyd, botanical curator of the Chihuahuan Desert Gardens at the University of Texas at El Paso, about what life is like in the Chihuahuan Desert. Kevin discusses:
• Elevation, winter freezes, and summer monsoon rains.
• Why no one really agrees on the precise boundaries of the Chihuahuan Desert
• The small cacti, agaves, yuccas, that thrive in the desert’s grassland landscapes
• Native bees, birds, bats, and the connections between plant diversity and animal life.
• Bighorn sheep in the Franklin Mountains, road mortality, and the case for wildlife crossings.
• How native landscaping and reduced pesticide use help support local food webs.

Our first taste of a new batch of Fred Bell’s nature recordings features coyotes around Furnace Creek Campground in Death Valley National Park. And Chris reflects on storm damage, past and future. Check on your neighbors!

Also! We've extended two deadlines. Our Fellowship for Desert Reporting is still accepting applications until October 31, and you can still be the first to submit an answer to our bird ID quiz from last week! Listen to the Fred Bell recording in S5E33; the first three emails received at chris@90milesfromneedles.com that correctly identify the birds in the audio by October 22 win a 90 Miles from Needles T-shirt.

Links and Resources:

Desert Diaries Podcast: https://www.ktep.org/podcast/desert-diaries

Chihuahuan Desert Gardens at UTEP: https://www.utep.edu/centennial-museum/chihuahuan-desert-gardens/

Kevin Floyd and Daniel Carey-Whalen staff profiles: https://www.utep.edu/centennial-museum/about/people.html

Fellowship for Desert Reporting: https://thedamn.org/fellowship

Support 90 Miles from Needles: https://www.90milesfromneedles.com/donate

Become a desert defender!: https://90milesfromneedles.com/donate

See omnystudio.com/listener for privacy information.

As promised a few episodes back, Chris explores a sneaky trick developers sometimes try to use to evade legally required environmental analysis of their projects. Segmentation, the term of art for dividing a large project into smaller pieces to obscure the environmental impacts of the whole project, is likely to become more frequent as the Trump administration keeps hacking away at environmental protection laws.

Chris provides a handful of illuminating examples:

• Cadiz gets the Interior Department to assess the company’s Northern Pipeline separately from the pumping it would enable, prompting new desert protection lawsuits.
• A non-desert example: 14 years ago, frontline community groups successfully challenged an upgrading of Chevron Oil’s refinery on Richmond, California. Though their allegations of segmentation (called “piecemealing” in California state law) didn’t sway a judge, the case illustrates how reasonable people can disagree on what constitutes segmentation.
• As the Federal approach to NEPA changes, Chris briefly examines what the erosion of CEQ regulations means for protecting the public and the environment from improperly segmented project proposals.
• An Imperial County victory: the court overturned a data center’s lot merger approval and required environmental review of the entire development.
• Fred Bell shares the dawn chorus from Sabino Canyon in Tucson.
• Apply for DAMN’s Fellowship for Desert Reporting, and support independent desert journalism through a donation to 90 Miles from Needles.

Cadiz lawsuit by Tribal Nations, NALC and NPCA, July 28, 2026: identifies plaintiffs and explains their objections to separate pipeline review.

Cadiz lawsuit by the Center for Biological Diversity and Sierra Club, July 28, 2026: Earthjustice’s account of the parallel challenge.

NPCA and NALC’s 2021 Northern Pipeline lawsuit: background on the earlier approval and litigation.

Communities for a Better Environment v. City of Richmond, 2010 appellate opinion: the decision distinguishes the successful project-description and greenhouse-gas claims from the rejected piecemealing claim.

Earthjustice on the Richmond refinery appeal: the community groups’ account of the outcome.

City of Imperial data center information and court documents: includes the September 9, 2026 decision, tentative decision, petitions and project documents.

KPBS coverage of the September 9 data center ruling: accessible explanation of the ruling.

Department of Energy history of CEQ regulations: official timeline and links to the rescission rules.

January 8, 2026 CEQ final rule: official Federal Register publication.

Podcast and support links

S5E1: Standing Up to Tech Giants: Desert Locals vs. California’s Largest Data Center

Fellowship for Desert Reporting

Support 90 Miles from Needles

Copper Mountain College

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Desert Dispatch Media is bringing together artists and communities to document how the AI buildout is affecting desert lands and the people who live there. Chris talks with organizer Melinda Matson Spina, filmmaker Jodi Darby, and musician Sage Bond about their planned community-led documentary, a short film for public assemblies, and the stories they hope to gather across the Southwest.

Sage describes composing with sounds and materials from the land, while Jodi explains how footage contributed by community members can shape the larger film. Chris also surveys actions communities and tribal governments are taking in response to proposed data centers.

Links and further reading

• Desert Dispatch Media

• Listen to Sage Bond on YouTube

• The Border Chronicle and its fifth-anniversary celebration

• Virginia’s Data Center Accountability Framework

• Gallup: Americans Oppose AI Data Centers in Their Area — In a March 2026 national survey, 71% of U.S. adults opposed construction of an AI data center in their local area.

• Support 90 Miles from Needles

• Episode image is from a satirical website dated 2013

Become a desert defender!: https://90milesfromneedles.com/donate

See omnystudio.com/listener for privacy information.

For our 150th episode, we return to a foundational question: why does the desert need people speaking up for it?

Chris offers four answers. Deserts are widely misunderstood as empty or expendable. They remain surprisingly understudied, even when familiar species such as Joshua trees are concerned. Desert protection cannot be separated from Indigenous sovereignty, migration, heat inequality, contaminated water, and the lives of working people. And beneath the science, policy, and activism lies a simpler reason: we love these places.

Listeners Kimberly, Nancy, and Diane share their own reasons for caring about deserts. Fred Bell supplies the nighttime voices of Woodhouse’s and Amargosa toads at Ash Meadows National Wildlife Refuge.

After the closing credits, Chris looks back at the geographical and topical reach of the podcast’s first 150 episodes—and identifies some of the places still missing from the archive.

In this episode:

• Why calling deserts “empty” makes them easier to sacrifice
• Creosote rings, desert fire and ecological time
• How invasive grasses have transformed wildfire in the Mojave
• Why conspicuous desert species can remain surprisingly understudied
• Environmental justice, border communities and urban heat
• What love contributes to conservation
• Where 150 episodes have taken us—and where the podcast needs to go next

Resources and related listening:

• The National Park Service explains how invasive plants can create a cycle of increasingly frequent and extensive Mojave fires: Fire in the Mojave Desert.
• NPS reports that the 2020 Dome Fire burned 43,273 acres, killed as many as 1.3 million Joshua trees and exposed the forest to a potential invasive-grass fire cycle: Dome Fire.
• Related episode: S4E31: Five Years On—Cima Dome After the Flames.
• Related episode: Joshua Trees and Family Trees.
• The Joshua Tree Genome Project and affiliated researchers are using mapping, crowdsourced observations and machine learning to study Joshua tree populations: The Yoder Lab at CSU Northridge.
• NOAA’s current assessment of the strengthening 2026–27 El Niño: ENSO Diagnostic Discussion.
• Related episode: S5E28: Four Things You Need to Know About Desert Flooding.
• Support the podcast at 90milesfromneedles.com/donate.
• Learn about the Fellowship for Desert Reporting at thedamn.org/fellowship.

• Not sure where to start with 150 episodes? Visit our Start Here page for a selection of episodes that offer a good introduction to 90 Miles from Needles.

Become a desert defender!: https://90milesfromneedles.com/donate

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Journalist Joe Dana of 12 News in Phoenix joins Chris Clarke to discuss questions raised by the August 29 flash flood in Grand Canyon National Park—and what happened inside the National Park Service before the disaster.

After the 2025 Dragon Bravo Fire, Grand Canyon Trails Supervisor Adam Gibson warned publicly that the upper North Kaibab Trail had become a substantially more hazardous environment. In a March appearance on The Grand Canyon Hiker Dude Show, Gibson described debris flows, hydrophobic soils and risks likely to persist for years.

Dana's reporting goes further. Sources told him that Gibson had recommended keeping the North Kaibab Trail closed for the 2026 season, and that park leadership initially appeared receptive to that recommendation before the entire trail reopened May 15. NPS had previously described its reopening strategy as adaptive, promising to “open what we can, where we can, when we can,” while balancing visitor safety, resource protection and operational readiness.

Chris and Joe talk about the pressures on park managers to restore public access, the risks faced by trail crews and visitors in a recently burned landscape, and the larger question built into National Park Service management: how do you provide public enjoyment of extraordinary places while ensuring that those places remain unimpaired for future generations? NPS policy says conservation ultimately takes precedence when those purposes genuinely conflict.

The August 29 flood killed two hikers, left a third missing, prompted roughly 80 rescues, and devastated infrastructure along Bright Angel Creek. As of September 8, the North Kaibab Trail, Phantom Ranch, Bright Angel Campground and several other inner-canyon areas remain closed, with no estimated reopening date.

Links and background

Joe Dana and 12 News

Grand Canyon Hiker Dude: Adam Gibson's March 4 interview

NPS: North Rim reopening announcement, March 25

NPS: Current North Rim and North Kaibab Trail status

National Park Service Management Policies: conservation and public enjoyment

Chris will also be taking 90 Miles from Needles to El Paso for the Fourth Chihuahuan Desert Conference, November 4–6, 2026, at the El Paso Zoo and Botanical Gardens.

Chihuahuan Desert Conference information

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