Tree Resources

Worker on a tree Benefit of Trees in Urban Areas - improve our air, protect our water, save energy, and more.

Trees are Good - quality arboraculture or treecare information including how to hire an arborist.

Tree City USA Program - direction, assistance, and national recognition for urban and community forestry programs.

Trade organizations

American Forests - a world leader in planting trees for environmental restoration, a pioneer in the science and practice of urban forestry.
California Arborists Association - a non-profit organization of professional arborists combining efforts to improve tree care practices in California.
International Society of Arboriculture (ISA) - the largest and most influential tree care education and research organization in the world.
National Arbor Day Foundation - a nonprofit foundation helping people plant and care for trees and encourage the celebration of Arbor Day.
Society of Municipal Arborists - A professional affiliate of the International Society of Arboriculture, promotes and improves municipal arboriculture and community forestry.
Western Chapter ISA - dedicated to fostering a greater appreciation for trees by promoting research and education to advance the professional practice of arboriculture.

California Releaf - Provides assistance, information and referrals to individuals, organizations and agencies working to improve the management of urban forests in California.
California Oak Foundation - Non-profit educational organization committed to preserving the state's oak forest ecosystem.
California Register of Big Trees - A program that maintains records for the largest specimen of each native and naturalized tree species growing in California.
CDF Urban & Community Forestry - offers grants each year to plant trees and other related projects in urban communities throughout California.
Center for Urban Forest Research - provided reliable scientific evidence that the benefits of urban forests add real value to communities since 1992.
Sudden Oak Death - A nonprofit organization that provides information on Sudden Oak Death.
TreeLink: The Community Forestry Resource - provides information, research, and networking for people working in urban and community forestry.
Urban Forest Ecosystems Institute - to address the increasing need for improved management of the urban forests in California.

Markham Nature Park and Arboretum - working toward the creation of an international garden to showcase plants from around the world that can thrive in our local micro-climate.

National Register of Big Trees - List of the largest of 826 species of trees in the US.
Tree Musketeers - The nation's first youth environmental organization–a nonprofit charity where kids are boss! While taking action to help the planet, kids teach other kids to become active citizens and community leaders.
Treetures - a community of tiny tree friends that teach you about trees, tree care, and tree planting.