Get expert tree care backed by science. Thompson's Tree Care provides ISA-certified arborist services including tree health assessments, disease diagnosis, risk evaluations, and personalized treatment plans for properties throughout Saint Louis, Missouri.
A certified arborist in Saint Louis, MO is a tree care professional who has earned credentials from the International Society of Arboriculture (ISA) by demonstrating verified expertise in tree biology, care, diagnosis, safety, and management. This is not a title anyone can claim — it requires passing a rigorous exam, meeting experience requirements, and maintaining certification through ongoing education.
Why does this matter to you as a homeowner in Saint Louis? Because trees are complex living organisms, and treating them incorrectly can cause more harm than good. An uncertified tree service might recommend removing a tree that could have been saved, miss a disease that is spreading to nearby trees, or perform improper pruning cuts that create entry points for decay. A certified arborist brings the scientific knowledge needed to make the right call every time.
At Thompson's Tree Care, our certified arborist is involved in every significant tree care decision. Whether you need a simple assessment of a tree that does not look right or a comprehensive evaluation of every tree on your commercial property, you get the expertise that only certification provides.
Our arborist examines your trees for signs of stress, disease, nutrient deficiency, structural problems, and environmental damage. You receive a clear assessment of each tree's condition and specific recommendations for care.
Using ISA Tree Risk Assessment Qualification (TRAQ) methodology, our arborist evaluates the likelihood of tree failure and the potential consequences. This is essential for trees near homes, driveways, play areas, and public spaces.
Saint Louis trees face threats from emerald ash borer, bacterial leaf scorch, oak wilt, apple scab, anthracnose, and many other pests and diseases. Our arborist identifies the specific problem and prescribes effective treatment before it spreads.
Based on the diagnosis, our arborist creates a customized treatment plan that may include targeted pruning, soil treatments, fungicide or insecticide applications, watering protocols, and follow-up monitoring schedules.
Choosing the right tree for your specific site conditions is critical to long-term success. Our arborist considers soil type, sun exposure, space constraints, nearby utilities, and the Saint Louis climate zone to recommend species that will thrive for decades.
The difference between a certified arborist and a general tree service is similar to the difference between a doctor and someone who owns a first aid kit. Both can help in certain situations, but when the situation is complex or the stakes are high, you want the trained professional.
A certified arborist in Saint Louis, MO brings knowledge of local tree species and their specific vulnerabilities, understanding of regional pests and diseases, awareness of local soil conditions (including the heavy clay soils common in the Saint Louis metro), and familiarity with municipal tree ordinances and permit requirements.
General tree services may excel at physical tree work, but they typically lack the diagnostic training to identify diseases in early stages, the knowledge to prescribe effective treatments, or the expertise to determine whether a tree should be preserved or removed. At Thompson's Tree Care, you get both — a certified arborist who provides the science-backed expertise and skilled crews who execute the physical work with precision.
Owner Jodie Thompson built Thompson's Tree Care & Landscaping with a commitment to doing tree work the right way. That commitment is why certified arborist expertise guides every service we provide, from routine trimming and pruning to complex dangerous tree removals. When you call us at (314) 712-3035, you are not getting a company that just shows up with chainsaws. You are getting a team that understands trees from the roots up.
Whether you are concerned about a tree that does not look healthy, want a professional opinion on whether a tree should be removed or can be saved with cabling and bracing, or need a formal arborist report for insurance or real estate purposes, Thompson's Tree Care provides the expert assessment you need. We serve homeowners throughout the Saint Louis metro area including Kirkwood, Chesterfield, Florissant, O'Fallon, and Belleville, IL.
Last Updated: March 2026
A certified arborist is a tree care professional who has earned certification through the International Society of Arboriculture (ISA) by passing a comprehensive exam covering tree biology, diagnosis, treatment, pruning, safety, and management. They provide expert tree health assessments, disease and pest diagnosis, risk evaluations, pruning recommendations, planting advice, and treatment plans that general tree service companies are not qualified to offer.
Common signs of tree disease include discolored or spotted leaves, premature leaf drop, mushrooms or fungal conks growing on the trunk or roots, cankers (sunken dead areas on the bark), oozing sap, dead branches in the crown, peeling bark, and powdery or fuzzy coatings on leaves. If you notice any of these symptoms, contact Thompson's Tree Care for a certified arborist evaluation.
Thompson's Tree Care offers free initial consultations for tree assessments in the Saint Louis area. If a detailed written report is needed for insurance, legal, or real estate purposes, formal arborist reports typically range from $150 to $500 depending on the scope and complexity of the evaluation.
A tree service company provides physical tree work like cutting, removal, and trimming. A certified arborist is a credentialed professional with verified expertise in tree science, health, and management. Thompson's Tree Care combines both — we have a certified arborist on staff who directs the diagnosis and treatment planning, and skilled crews who execute the physical tree work. This combination ensures every job is done with both expertise and precision.