The following organizations provide information regarding tree and shrubbery selection, planting and maintenance.

Alliance for Community Trees Dallas, Texas (214) 953-1184

American Forests Washington, D.C. (202) 955-4500 www.amfor.org

American Society of Consulting Arborists Rockville, Md. (301) 947-0483 asca-consultants.org

American Society of Landscape Architects Washington, D.C. (202) 898-2444 www.asla.org

International Society of Arboriculture Champaign, Ill. (217) 355-9411 www2.champaign.isa-arbor.com

The National Arbor Day Foundation Nebraska City, Neb. (402) 474-5655 www.arborday.org

National Integrated Pest Management Network (919) 515-1648 PlantProtection.org/nipmn

National Science Foundation Center for Integrated Pest Management Raleigh, N.C. (919) 515-5644 ipmwww.ncsu.edu/cipm

National Tree Trust Washington, D.C. (202) 628-8733 www.nationaltreetrust.org

The Nature Conservancy Arlington, Va. (800) 628-6860 www.tnc.org

Sierra Club San Francisco, Calif. (415) 977-5500 www.sierraclub.org

Society of Municipal Arborists University City, Mo. (314) 862-1711 www.urban-forestry.com

TreeLink Salt Lake City (801) 364-2122 www.treelink.org

U.S. Forest Service Washington, D.C. (202) 205-1389 www.fs.fed.us

The U.S. National Arboretum Washington, D.C. (202) 245-2726 www.ars-grin.gov/ars/Beltsville/na