- American Forests Famous and Historic Trees
 - Nonprofit citizens' organisation that sells cuttings from trees of historical significance as part of the Historic Tree Nursery project. - Arbor Computer Systems
- Offers software and hardware for the arborist.
- Arboricultural Association
- U.K. association for the amenity tree care professional in either civic or commercial employment at craft, technical, supervisory, managerial or consultancy level.
- ArborMaster Training, Inc.
- Provides educational programmes throughout North America, which focus on safety, skill, and productivity training for the tree care industry.
- Asplundh Tree Expert Co.
- Provides vegetation management and other services to the electric utility industry. Asplundh also maintains vegetation for railroads, pipeline companies, and governmental agencies.
- Bartlett Tree Experts
- Providing tree health care services in the U.S. and England.
- Caledonian Tree Company, The
- Manufacturer of Root Control Bags and SpringRing Air Pruning Containers.
- Davey Tree Expert Co.
- Includes guide to tree and lawn care, tree talk, professional opportunities and company history.
- DeepRoot
- Manufactures tree root barriers which protect hardscapes from damage. Products also include tree ties and trunk protectors.
- Easy Steps to Fruit Tree Pruning
- Instructional video to learn how to prune trees the right way.
- Eco-Libris
- Help plant trees to balance out all those books you read.
- Elmcare.com
- Devoted to all aspects of elm trees and their specialised care with sections dealing with disease, tree physiology, elm trivia, and more.
- Essco Distributors
- Wholesale provider of arborist, tree care, and pruning supplies.
- Hybrid Poplar Cuttings
- Fast growing trees. Cuttings are available from December to April.
- MemorialTrees.com
- Offers tree planting for memorials, gifts, business achievements, and events.
- Memory Trees
- Plants memorial trees in any U.S. state, Israel, and the Amazon. Also sells eco-friendly gifts.
- Midwest Arborist Supplies
- Source for tree care and pruning supplies, including fertilizer, climbing equipment, micro-injection, cabling and bracing, and anti-transpirants.
- Muench Co.
- Serving the arborist trade with Bandit chippers, Rayco stump grinders, John Bean sprayers, and other products by Husqvarna, Chippewa, Petzl, and Timberwolf.
- National Arborist Association
- Trade association of commercial tree care firms.
- Oklahoma Arborist Supply
- Sells equipment and supplies for arborists and tree climbers including rope, saddles, carabiners, handsaws, and gloves.
- Rainbow Treecare
- Treating tree diseases including Dutch Elm and Oak Wilt.
- Segal Ranch
- Offers hybrid poplars and native trees for home and business customers and for environmental remediation.
- Treegifts
- Offers native British trees with personalised tags and greetings cards. Includes suggestions for which trees to send for different occasions.
- TreeGivers
- Provides tree planting for memorials, gift occasions, and corporate events.
- TreeHelp
- Offers tree care products and provides tree and shrub care resources including species, disease, and insect information.
- Trees for the Holy Land
- Offers tree plantings in Israel for births, weddings, and in memoriam.
- WesSpur Tree Equipment
- Supplier of arborist and tree climbing equipment, rope, new and used brush and wood chippers, stump grinders, crawlers, and land clearing machinery.
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