Guerrilla Gardener Transforms LA River into Thriving Wetland

In November 2025, artist Doug Rosenberg's guerrilla wetland project in the Los Angeles River continues to captivate the city. Back in 2020, Rosenberg was struck by the sight of a shopping cart in the river that had become a home for a blue heron. This planted the seed for his next project: transforming a desolate part of the concrete-lined river into a thriving wetland.

Rosenberg pushed large rocks from the riverbanks into the water, arranging them in loose, concentric circles. This simple structure trapped sediment, allowing plants and animals to take root. Over 10 weeks, a 10-by-20-foot green island emerged in the middle of the 100-foot-wide channel. Rosenberg sees this as a work of "performance art" - a visual statement that aims to inspire environmental action.

However, Rosenberg's guerrilla tactics have put him at odds with local authorities. Modifying the river channel without permits is illegal, as it could impact water quality, habitat, and flood control. Still, some city officials acknowledge that Rosenberg and other "guerrilla gardeners" have played a crucial role in drawing attention to the river's potential. As the city slowly works to revitalize the concrete channel, Rosenberg's unauthorized wetland serves as a reminder that small-scale, community-driven efforts can make a difference.