Park rangers have dismantled a large-scale illegal cannabis cultivation site inside Sequoia National Park, spanning about 13 acres.

Massive Cleanup Effort

The National Park Service (NPS) reported removing 2,377 mature cannabis plants along with nearly 2,000 pounds of trash and equipment. Crews used both hand labor and helicopter sling-loads to haul debris from the remote area.

Hazardous Chemicals and Weapons Found

Law enforcement first discovered the site in 2024, but cleanup was delayed due to toxic chemicals. Among the materials found was a gallon of Methamidophos, a pesticide banned in the U.S. since 2009, as well as a semi-automatic pistol.

Environmental Damage

Investigators documented severe ecological harm, including diverted creek water, irrigation lines, dug-out pits, destroyed vegetation, terraced hillsides, makeshift camps, and two miles of illegal trails. Evidence of poaching was also uncovered.

Broader Impact of Illegal Cultivation

According to the NPS, large cannabis grows drain six to eight gallons of water per plant daily, depriving wildlife and native plants. Runoff often carries dangerous pesticides into waterways.

Over the past 20 years, nearly 300,000 plants worth about $850 million have been eradicated from Sequoia and Kings Canyon National Parks.

Black Market Strain on Ecosystems

Though cannabis was legalized in California in 2016, strict regulations have fueled a thriving black market. Across the state, unregulated sites have caused widespread environmental destruction.

In Siskiyou County, more than 15,000 acres of illegal cannabis grows have nearly wiped out local wildlife. “You’re lucky to find a lizard,” said Rick Dean, the county’s environmental health director.

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