Patterns and correlates of unlicensed cannabis cultivation in California (USA) following adult-use legalization
Since California legalized adult-use cannabis, unlicensed cultivation has unevenly persisted. This study uses spatial data (2018–2024) to analyze geographic trends, driving factors, and environmental impacts across 30 counties. While physical traits like topography and remoteness affect cultivation density, socio-political policies have more complex impacts. Crucially, licensed farms were the single largest and most consistent predictor of reduced unlicensed cultivation, suggesting that active participation in permitting regimes fosters stability, norm formation, and deterrence. In contrast, local bans and enforcement do not eliminate cultivation; instead, they trigger “whack-a-mole” dynamics that increased volatility and, in some cases, environmental exposure. Environmental sensitivity emerged as a significant factor in later periods, with regulated counties showing reductions in cultivation in vulnerable areas, highlighting the potential for permitting systems to mitigate ecological impacts. These findings emphasize the importance of participatory, stable, and well-implemented regulatory frameworks for managing unlicensed cultivation and provide broader insights for formalizing informal or illicit resource use in varied socio-ecological contexts.
This project was funded by the California Department of Cannabis Control using monies collected through the California Cannabis Tax Fund. Any opinions, findings, and conclusions or recommendations expressed in this material are those of the author(s) and do not necessarily reflect the official views or policies of the State of California. This work was also supported by the Campbell Foundation and the Resources Legacy Fund.
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