Peer reviewed research.
Archives: Recommended Websites
Friends of the Trees
A Portland-based non-profit organization, Friends of Trees advocates for urban forestry issues. They provide education about greening urban areas and caring for existing trees in the urban forest.
Information Resources for Trees in Cities
A list of the best books, articles and websites on Trees in Cities.
TreeLink: Caring and Maintenance Resources
Provides information, research and networking for people working in urban and community forestry. Includes topics such as caring for trees, diesease, soil, etc.