Arborday Tree Guide
- Offers detailed information on dozens of commonly planted landscape trees.
- http://www.arborday.org/treeguide/

What tree is it?
- Provides a few simple methods to quickly identify any unknown tree.
- http://www.oplin.org/tree/

Casey Trees Endowment Fund
- A project to restore the tree canopy of Washington, DC. Includes a review of the street tree inventory carried out in 2002.
- http://www.caseytrees.org/

What Tree Is That?
- Arbor Day Society's online tree identification site for Eastern/Central and Western USA trees.
- http://www.arborday.org/trees/treeid.cfm

Keslick & Son: Modern Arboriculture
- Tree care information includes tree biology, tree and soil chemistry help, and organic tips.
- http://home.ccil.org/~treeman/

The Treehouse
- Forum for arborists, with discussions on gear, techniques, training, tree health and care, and informal chat.
- http://gypoclimber.com/treehouse/

Trees & Shrubs
- Provides links to other Web sites related to trees and shrubs.
- http://www.odla.nu/garden_links/trees.shtml

TreeLink
- Resource for urban and community forestry: planting and caring for trees in cities and towns. Includes links list, research, news, forums, and educational materials.
- http://www.treelink.org/

Acer palmatum - Japanese Maple
- Provides a brief summary to the variety, growth, character of Acer palmatum for hardiness zones 5 through 8.
- http://web1.msue.msu.edu/msue/imp/modop/00000018.html

TreeDazzled
- Tree enthusiast presents how-to and academic articles on trees and their propagation, with blog and a photo gallery of California trees.
- http://www.treedazzled.com/

Deciduous Trees and Shrubs With All-Season Interest
- Contains information and pictures.
- http://ohioline.osu.edu/hyg-fact/1000/1143.html

Staking and Guying Trees
- Contains information and diagrams.
- http://ohioline.osu.edu/hyg-fact/1000/1141.html

Monthly Tree Tips
- Monthly guide to caring for trees from the Massachusetts Arborists Association, including a featured tree for each month.
- http://www.massarbor.org/treetips/treetips.html

Tree Trail
- Contains descriptions of rare trees native to the Eastern United States, and provides information about growing them on private property.
- http://www.treetrail.net

Betula lenta
- Uses, cultivation and description for this tree, commonly known as cherry birch, sweet birch, or black birch.
- http://www.hort.purdue.edu/newcrop/duke_energy/Betula_lenta.html

The-Tree
- Resource for a wide range of information about trees and forests: Trees and the environment, British trees, cultivation, tree medicine, news and other features.
- http://www.the-tree.org.uk/

Dictionary of Tree Terms
- Keslick and Son Aboriculturist's alphabetical listing of tree terminology. An online dictionary of tree terms including summarized definitions, articles, and photographs.
- http://www.treedictionary.com

West Coast Native Tree ID
- A dichotomous key to identify trees native to the West coast of the United States. Includes photos and information on these trees.
- http://signsofdissent.com/webbedfeet/tree/treebegin.html

Flowering Trees
- Articles on flowering trees used in landscaping, including weeping trees, saucer magnolias, dogwoods and crape myrtles. Each illustrated article spans several pages.
- http://landscaping.about.com/od/floweringtrees/

Trees of the Pacific Northwest
- An identification guide to conifers of the Pacific Northwest provided by Oregon State University.
- http://oregonstate.edu/trees/

The Trees of Reed College
- Offers photographs and descriptions for a variety of trees that can be found on the campus of Reed College in Portland, Oregon. Visitors can identify trees by location or find the location of examples of a certain kind of tree.
- http://web.reed.edu/trees/

Better Homes and Gardens: Tree Pictures
- A collection of American tree pictures.
- http://www.bhg.com/home/Tree-Pictures.html

English Oak Trees
- Natural history of English Oaks (Quercus robur), their life, conservation and woodland restoration. How to obtain acorns from old oak trees by mail order.
- http://www.oldknobbley.com

Oak Wilt Treatment and Prevention
- Specializing in the analysis, prevention and treatment of oak wilt using Alamo fungicide and root trenching. Offers free consultation, cedar clearing, dead tree removal, and replanting services.
- http://www.stopoakwilt.com/

TreeHelp.com
- Source of information regarding tree and shrub care including how-to articles, species profiles, insect and disease information and other features.
- http://www.treehelp.com/

Ice Damage On Trees
- Heavy accumulations of snow and ice can cause major structural damage to trees and shrubs. The damaged limbs should be properly removed. The following links will provide a guide for homeowners seeking to repair damaged plant material.U.of Illinois
- http://www.urbanext.uiuc.edu/icedamage/

How to Plant Trees
- Gives information on where to use trees and how to plant them correctly.
- http://backyardgardener.com/tree/index.html

Collier Arbor Care
- Tree, shrub and turf information, IPM practices, insect and disease articles, tree care information, annual garden calendar.
- http://www.collierarbor.com/

How to Grow and Maintain Birch Trees
- Learn how to care for a birch tree, including selecting the correct site and type of birch, watering, fertilizing, mulching, and monitoring for problems.
- http://www.birch-tree.com

Arnold Arboretum
- The Arnold Arboretum is a research and educational institution. It manages a collection of hardy trees, shrubs, and vines located in Boston, Massachusetts and associated herbarium and library collections.
- http://arboretum.harvard.edu/

State and Provincial Trees
- A list of official state and provincial trees of all 50 U.S. states and 13 Canadian provinces and territories including both common and scientific names and images of official flags.
- http://www.state-tree.com

Southern African Trees
- A listing of southern african trees with photos, providing general and cultivation information, concentrating on plants suitable as bonsai, potplants or with edible fruit.
- http://www.africantrees.com/

University of Alabama in Huntsville Grounds Management Page
- A resource for Southern gardeners who need information on trees that grow well in their area.
- http://www.uah.edu/admin/Fac/grounds/

The WVU Tree Bark Home Page
- Designed to provide a place to learn about the anatomy and physiology of tree bark, fungal canker diseases that affect tree bark, the wound responses of injured tree bark, and the role of wound responses in the resistance of living tree bark to woun
- http://www.caf.wvu.edu/bark/