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http://actrees.org/
US movement to support urban and community forestry: planting and caring for trees in cities and towns. Includes news, forums, regional resource listings, and educational materials.
http://www.arboretum.harvard.edu/
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://www.bhg.com/gardening/trees-shrubs-vines/trees/
Portal collecting a variety of short articles about gardening with trees.
http://www.hort.purdue.edu/newcrop/duke_energy/Betula_lenta.html
Uses, cultivation and description for this tree, commonly known as cherry birch, sweet birch, or black birch.
http://caseytrees.org/
A nonprofit with a mission to restore, enhance and protect the tree canopy of the nation's capital.
http://cirrusimage.com/wp/trees/
Explore over 400 species of trees and shrubs, arranged by their botanical family, via diagnostic photographs and descriptive articles.
http://www.collierarbor.com/
Tree, shrub and turf information, IPM practices, insect and disease articles, tree care information, annual garden calendar.
http://cotinus.net/
Home gardener compares the varieties he grows, with photos of various stages of growth.
http://www.treedictionary.com/
Keslick and Son Aboriculturist's alphabetical listing of tree terminology. An online dictionary of tree terms including summarized definitions, articles, and photographs.
http://www.oldknobbley.com/
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://landscaping.about.com/od/floweringtrees/
Articles on flowering trees used in landscaping, including weeping trees, saucer magnolias, dogwoods and crape myrtles. Each illustrated article spans several pages.
http://birch-tree.com/
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://extension.illinois.edu/icedamage/
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.massarbor.org/treetips/treetips.html
Monthly guide to caring for trees from the Massachusetts Arborists Association, including a featured tree for each month.
http://plants.ces.ncsu.edu/plants/category/trees/
Collection of factsheets on a variety of tree species, including scientific names, growing zones and maintenance.
http://www.stopoakwilt.com/
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://state-tree.com/
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://blogs.reed.edu/trees/
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://treenotes.blogspot.com/
Weblog related to native trees of North America, especially Kentucky.
http://www.treetrail.net/
Contains descriptions of rare trees native to the Eastern United States, and provides information about growing them on private property.
http://www.tree-care.info/
Information on many aspects of tree care. Includes an advice forum and help finding a tree surgeon in the UK.
http://www.treehelp.com/
Source of information regarding tree and shrub care including how-to articles, species profiles, insect and disease information and other features.
http://oregonstate.edu/trees/
An identification guide to conifers of the Pacific Northwest provided by Oregon State University.
http://signsofdissent.com/webbedfeet/tree/treebegin.html
A dichotomous key to identify trees native to the West coast of the United States. Includes photos and information on these trees.
http://www.oplin.org/tree/
Provides a few simple methods to quickly identify any unknown tree.
http://www.arborday.org/trees/whattree/
Arbor Day Society's online tree identification site for Eastern/Central and Western USA trees.
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