- Champion Tree Project International (2)
- Wikipedia: Tree
 - Article about trees, the large, perennial, woody plants, that includes profiles of numerous species. - How to Grow and Maintain Birch Trees
- Provides information for the care and selection of a birch tree.
- Forest and Shade Tree Pathology
- Contains information about major diseases that affect trees.
- International Ornamental Crabapple Society
- Identifies disease-resistant cultivars and provides information to members.
 Neem Foundation
- Features Neem and other botanical alternatives.- Moon Trees
- History of the trees whose seeds accompanied the Apollo 14 mission in 1971 and were planted throughout the United States. Includes locations of known trees and links.
- Elm Research Institute
- Provides information about the Liberty Elm, an American Elm that is resistant to Dutch Elm disease.
- Elmcare.com
- Devoted to all aspects of elm trees and their specialised care with sections dealing with disease, tree physiology, elm trivia, and more.
- American Chestnut Foundation, The
- Contains information on chapters, history, identification, and more. Dedicated to restoration and preservation.
- SUFA's Tree Care Center
- Information on tree planting, pruning, and general care. Explains how professional tree appraisals can help you in insurance, real estate, and legal proceedings.
- Cornell University - Sugar Maple Research and Extension Program
- Information about maple tress and collecting sap for syrup.
- Trees of Time and Place
- Project encouraging the planting of trees in the new millennium.
- International Society of Aboriculture@
- eNature: Trees
- Photographic nature field guides for identifying trees, sorted by leaf type: needle-leaf conifers, scale-leaf conifers, untoothed simple leaves, toothed simple leaves, lobed simple leaves, compound leaves, and palms.
- American Forests' National Register of Big Trees
- Features the largest known specimens of native and naturalised trees in the United States.
- Trees for Life Canada
- Children's environmental education programme for teachers and leaders. Teaches children about the importance of trees through the "Grow-A-Tree" programme.
- Trees
- Comprehensive guide to trees from the National Arbor Day Foundation. Learn about the benefits of trees; tree selection, care, planting, and pruning; and how to identify different tree species.
- Horse Chestnut Tree
- Provides information about the tree, aesculus hippocastanum, which produce conkers, used by kids for the autumnal playground game.
- University of Tennessee, Knoxville - Dogwood Research Group
- Striving to improve and protect the dogwood tree and its relatives through breeding, research, and public communication.
- World Community of Old Trees
- Painting and drawings of old trees by students. Includes project ideas for teachers.
- History of Palaeozoic Forests: The Early Forests and the Progymnosperms
- Focuses on the early tree, Archaeopteris, appearing in the late Devonian.
- Tips 4 Trees
- How to promote healthy, long-lived trees. Lists good (and bad) pruning, thinning, aeration, watering, and fertilizing practices.
- Year in the Wonderland of Trees, A
- Articles and excerpts on the importance of trees and the environment. The children's textbook answers questions about Fall leaf colour, tree and leaf identification, tree growth, and what are the different varieties of trees.
- Hazard Tree Web Page
- Publications and articles dedicated to how to manage defective trees, particularly in an urban setting.
- Garden Tree Information - Popular Gardening Trees
- Garden Guides trees section offers a wealth of information on every kind of tree a gardener might want to plant.
- Trees Are Good
- Designed to educate the public about proper tree care. Trees Are Good also addresses the benefits and value of trees along with tree planting information.
- Trees: Quotes, Poems, Proverbs, Maxims, Links
- Collection of quotes for those that love gardens, gardening, and the green way.
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