Trees and Crime

I've been stumbling across a lot studies lately about the links (or lack thereof) between vegetation and crime.I remember back in grad school when I was studying Landscape Architecture, we would meet with communities to discuss what types of parks and resources they would most like to see. The folks in the Fruitvale Neighborhood in Oakland repeatedly told us that they didn't want creeks or trees because these bred crime. Although there was no evidence to support this assertion, several people living in the area balked when we suggested opening up a waterway and adding greenspace.

Another study has come out examining the link between vegetation and crime. A study of Philadelphia indicated that where there are lots of trees, we see lower rates of assaults, robbery, and burglary. Theft, however, was not lower. Interesting to figure out how the perception of crime and statistics play out. (Personally, when I have been robbed the culprits have tended to hide behind cars, not trees). It is educational to juxtapose these crime studies with other work generally linking lower vegetation with lower income neighborhoods.

More on that Philadelphia Study:

"Does Vegetation Encourage or Suppress Urban Crime? Evidence from Philadelphia, PA" by Mary K. Wolfe and Jeremy Mennis in Landscape and Urban Planning (20 Sept. 2012).

ABSTRACT: There is longstanding belief that vegetation encourages crime as it can conceal criminal activity. Other studies, however, have shown that urban residential areas with well-maintained vegetation experience lower rates of certain crime types due to increased surveillance in vegetated spaces as well as the therapeutic effects ascribed to vegetated landscapes. The present research analyzes the association of vegetation with crime in a case study of Philadelphia, Pennsylvania. We examine rates of assaults, robberies, burglaries, and thefts in relation to remotely sensed vegetation abundance at the Census tract level. We employ choropleth mapping, correlation, ordinary least squares regression, and spatial econometric modeling to examine the influence of vegetation on various crime types while controlling for tract-level socioeconomic indicators. Results indicate that vegetation abundance is significantly associated with lower rates of assault, robbery, and burglary, but not theft. This research has implications for urban planning policy, especially as cities are moving towards ‘green’ growth plans and must look to incorporate sustainable methods of crime prevention into city planning.

 jessie owley