Rethinking Wildfire Defense: How a Landscape Approach Can Protect Neighborhoods

The Eaton Fire in Altadena, California, highlights the growing threat of wildfires in the Wildland Urban Interface (WUI) due to climate change and inadequate infrastructure. As Ronnie Siegel explains in this article, while initial assumptions often blame vegetation, post-fire evidence suggests trees and plants were not the primary culprits in the fire's spread—in fact, many served as protective barriers. A landscape-based approach to wildfire risk reduction involves limiting new development in the WUI, creating vegetated buffer zones, and making urban areas more fire-resistant through "home hardening" and updated land-use planning strategies. These measures, when implemented at both the individual and community levels, can help minimize future fire damage.

The Eaton Fire, fueled by drought-stricken chaparral and extreme Santa Ana winds, was likely ignited by a spark from power lines and rapidly spread via wind-driven embers. Thousands of homes burned, largely due to their flammability and close proximity to one another, overwhelming the region’s water supply and firefighting resources. Yet, in many places, native and well-watered trees — such as oaks and deodars — survived and even shielded homes from embers. Observations and LiDAR imaging suggest that fire-adapted and water-retentive plants, both native and non-native, can provide significant protection, challenging current defensible space guidelines that label many of these species as hazards.

Moving forward, experts recommend revisiting and updating these guidelines using on-the-ground data and further research into plant water retention and fire resistance. Collaboration among scientists, fire professionals, planners, and residents will be essential to determine the most effective plant species, landscape designs, and urban green buffer zones. Satellite imagery and post-fire mapping also indicate that urban vegetation — if properly maintained and irrigated — can slow wildfire spread and protect communities. By integrating fire science with landscape planning, we can build more resilient neighborhoods and reduce the risk of future wildfire disasters.