ResearchWorks: Volume 7 Number 2 | HUD USERPhiladelphia has a history of combating property blight with cleanup and greening activities. Significant post-WWII losses of businesses, employment, population, public revenue, property values, and morale left many of the city's neighborhoods with vacant lots and neglected houses. The city's efforts to fight this blight entwine with those of the Pennsylvania Horticultural Society (PHS), a nonprofit that promotes the use of horticulture to improve quality of life and create a heightened sense of