- American Chestnut Foundation, The
 - Contains information on chapters, history, identification, and more. Dedicated to restoration and preservation. - American Forests' National Register of Big Trees
- Features the largest known specimens of native and naturalised trees in the United States.
- Champion Tree Project International (2)
- Cornell University - Sugar Maple Research and Extension Program
- Information about maple tress and collecting sap for syrup.
- 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.
- 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.
 English Oak Trees
- Highlights the complexity and value of the English Oak, otherwise known as the Pedunculate Oak, Common Oak, or universally Quercus Robur.- Forest and Shade Tree Pathology
- Contains information about major diseases that affect trees.
- 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.
- Growing Citrus in the UK
- Offers tips on compost, watering, and feeding.
- Hazard Tree Web Page
- Publications and articles dedicated to how to manage defective trees, particularly in an urban setting.
- History of Palaeozoic Forests: The Early Forests and the Progymnosperms
- Focuses on the early tree, Archaeopteris, appearing in the late Devonian.
- How to Grow and Maintain Birch Trees
- Provides information for the care and selection of a birch tree.
- International Ornamental Crabapple Society
- Identifies disease-resistant cultivars and provides information to members.
- International Society of Aboriculture@
- 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.
- Neem Foundation
- Features Neem and other botanical alternatives.
- SUFA's Tree Care Center
- Information on tree planting, pruning, and general care. Explains how professional tree appraisals can help you in insurance, property, and legal proceedings.
- The Stump Online
- Dedicated to the noble tree stump. Features tree stump art, enemies, games, history, how to, pictures, and video.
- Tips 4 Trees
- How to promote healthy, long-lived trees. Lists good (and bad) pruning, thinning, aeration, watering, and fertilizing practices.
- Tree Photos - Flickr
- See recent and popular tree images from the Flickr community.
- Tree Register, The
- Unique record of ancient, historical, and the largest trees in Great Britain and Ireland.
- 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.
- 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 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 of Time and Place
- Project encouraging the planting of trees in the new millennium.
- Trees: Quotes, Poems, Proverbs, Maxims, Links
- Collection of quotes for those that love gardens, gardening, and the green way.
- University of Tennessee, Knoxville - Dogwood Research Group
- Striving to improve and protect the dogwood tree and its relatives through breeding, research, and public communication.
- Wikipedia: Tree
- Article about trees, the large, perennial, woody plants, that includes profiles of numerous species.
- World Community of Old Trees
- Painting and drawings of old trees by students. Includes project ideas for teachers.
- 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.
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