- National Arborist Association
 - Trade association of commercial tree care firms.  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.- TreeHelp
- Offers tree care products and provides tree and shrub care resources including species, disease, and insect information.
- Bartlett Tree Experts
- Providing tree health care services in the U.S. and England.
- 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.
- TreeGivers
- Provides tree planting for memorials, gift occasions, and corporate events.
- Davey Tree Expert Co.
- Includes guide to tree and lawn care, tree talk, professional opportunities and company history.
- 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.
- Trees for the Holy Land
- Offers tree plantings in Israel for births, weddings, and in memoriam.
- 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.
- 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.
- Midwest Arborist Supplies
- Source for tree care and pruning supplies, including fertilizer, climbing equipment, micro-injection, cabling and bracing, and anti-transpirants.
- ArborMaster Training, Inc.
- Provides educational programmes throughout North America, which focus on safety, skill, and productivity training for the tree care industry.
- DeepRoot
- Manufactures tree root barriers which protect hardscapes from damage. Products also include tree ties and trunk protectors.
- ASG Tree Services
- Services include felling, remedial surgery, tree health and safety, and more.
- Connick Tree Care
- Tree surgeons operating in South-East England. Specialists in the preservation and maintenance of trees.
- Arbor Computer Systems
- Offers software and hardware for the arborist.
- Segal Ranch
- Offers hybrid poplars and native trees for home and business customers and for environmental remediation.
- Oklahoma Arborist Supply
- Sells equipment and supplies for arborists and tree climbers including rope, saddles, carabiners, handsaws, and gloves.
- Professional Tree Services
- Offers a broad range of arboricultural, forestry, landscaping, and consultancy services to the domestic, corporate, and utility sectors.
- Caledonian Tree Company, The
- Manufacturer of Root Control Bags and SpringRing Air Pruning Containers.
- Easy Steps to Fruit Tree Pruning
- Instructional video to learn how to prune trees the right way.
- Beeches Tree Care
- Offers a range of tree care services in London and the Home Counties.
- Muench Co.
- Serving the arborist trade with Bandit chippers, Rayco stump grinders, John Bean sprayers, and other products by Husqvarna, Chippewa, Petzl, and Timberwolf.
- Jolly Good Tree Fellers
- Family-run business offering all aspects of tree care.
- Eco-Libris
- Help plant trees to balance out all those books you read.
- Environmental Design
- Specialises in large tree transplanting, tree moving, and farming services.
- Memory Trees
- Plants memorial trees in any U.S. state, Israel, and the Amazon. Also sells eco-friendly gifts.
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