Mark Webber's Arboricultural & Horticultural Consultancy                                      Forensic Arborists & Horticulturalist

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Forensic Arborists & Horticulturalist

Mark A.Webber is a nationally known plant and tree forensic expert. Mark holds 20 separate certifications, qualifications, and licensures in the United States and Europe. Mark most notably, is a Board-Certified Master Arborist, Registered Consulting Arborist® (RCA), and a Certified Professional Horticulturist with an excess of 47+ years of experience. Mark's expertise includes and not limited to:

  •  Tree Failure Forensics, Tree Felling and Removal operations, Soil Testing, Landscape Care, Tree Risk Assessment, Plant Appraisal, Herbicide Injury, Dendrology, Chronodendrology, Tree Failure Analysis, Tree Roots, Proper Pruning, Plant Growth Modeling, Abotic events affecting plants, and Greens Industry workplace safety and other related issues.




About us

At Mark Webber's Arboricultural & Horticultural Consultancy, we are a firm of highly respected, experienced, knowledgeable, and skilled arboricultural and horticultural forensic consultants. Our firm specializes in the science, standards, and the "Best Management Practices" of trees and plants. As independent tree & horticultural forensic experts, we provide unbiased assessments, opinions, and recommendations regarding trees and plants.

Mark Webber's Arboricultural & Horticultural Consultancy is a full-service business that serves the legal, insurance, developers, architects, engineers and property owners throughout the United States and Internationally. Our firm provides unbias objective analysis when questions and answers are needed about plants and tree conditions. We are often assigned the task to answer questions related to dangerous conditions, causation, notice, the standard of care, and damages.

Mark worked formally with Robson Forensic Inc. and He is the only forensic arborist in the United States that retains 20 different certifications, licensures, and qualifications. 

Mark can assess your individual concerns whether regarding tree health, tree pests and diseases, tree risk, tree value or tree protection during construction.

Strictly a consultant, you can be assured that Mark's opinions are free of the need to sell services. This eliminates the pressure or scare tactics that may lead to paying for unnecessary services. Mark can also provide a valuable second opinion when expensive tree services have been prescribed by others.

Mark also works with Home Owners Associations, attorneys, land developers, and governments on larger-scale projects as well as offering expert witness services for the legal community.

Property managers, homeowners, insurance adjusters, and legal professionals regularly rely on our qualified consulting arborists and horticulturalists to formulate method-based expert opinions that are rooted in reliable peer-reviewed science. As a result, our professional opinions are more consistent with modern practices and yield defensible results. 

Mark Webber’s Arboricultural & Horticultural Consultancy LLC has provided technical assistance to many clients throughout the United States and Internationally.

Listen to Garden Talk with Mark Webber every Saturday morning from 6 a.m. to 8 a.m. on WHIO Radio or click here on the Garden Talk with Mark Webber Podcast. Every weekend Mark Webber provides 2 hours of great gardening and landscaping advice while taking your calls. Also, you can listen to previous shows by clicking here.

Property managers and homeowners alike are avoiding improper planting, mismanagement, preserving value, saving money, and improving safety through the use of our consulting services. To learn more about our firm click here.  


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Our services

Tree Risk Assessment Services

If a tree is green and healthy is not an indicator that the tree is structural sound. While a sick looking trees have conditions that can be improved by proper scientific diagnosis.

We can provide Risk and Health Assessments on trees and landscape plants. Unlike most Consulting Arborist, we have climbing consultants who can climb trees to complete aerial assessments. We use state-of-the-art evaluation tools, including the Resistograph Drill and sound tomography to assess trees. Our approach is intended to save valuable trees and identify those that are of concern for potential risk. improve health, and general tree care instructions. Our ISA Certified Tree Risk Assessors use the current Tree Risk Assessment method and are qualified to file applications for removal permits with municipalities. We specialize in structural assessment and decay diagnostics with the Resistograph drill & sound tomography , a tool that gives us information on the interior condition of the tree.
Starch Testing & Analysis
We test trees for health. All green plants produce sugar (energy)in their leaves during photosynthesis. The sugar is then either used in the leaves as an energy source for growth or production of other essential materials, or it is transported via the phloem (inner bark) to other parts of the tree. 

Tree & Plant Appraisals

Trees and plants provide many benefits and value to the property owners in functional, aesthetic, social, food, crops, environmental, and have they have economic value. Mark Webber offers 25 plus years of experience with plant appraisal. 

Mark Webber is uniquely qualified to determine the value of the claim in your case. Mark is designated by the American Society of Consulting Arborist as a (TPAQ)Tree & Plant Appraisal Qualified professional.
Dendrochronology & Wood Identification
Dendrochronology (or tree-ring dating) is the scientific method of dating tree rings (also called growth rings) to the exact year they were formed. We can answer questions like how old a tree is or when a tree was damaged and when it likely became decayed.

We also provide services for the identification of wood genus and in some cases the species.
Spectral Reflectance Analysis
Spectral Reflectance is a measure of the wavelength of the electromagnetic energy collected by plants including trees. Our company provides clients the collection of historical spectral reflectance data of crops as well as tree popluation for clients.
Herbicide Injury Experts
Herbicide injury to plants has become a commonplace in many properties throughout the United States and in many cases the exposure can and will cause plant death, if the dosage rates have cause significant vascular injuries internally to the plant. But in certain chemical exposure events plants can recover with proper care. Keep in mind most herbicide injuries and chemical exposure are preventable.  

Soil Testing & Analysis
Learning as much as you can about your soil will help you decide what needs to be done to make it ideal for the plants you want to grow. If you can learn about your soil’s texture, composition, drainage, acidity, and mineral density, you will avoid, upfront, the disappointing results that can occur when your soil is unsuitable for your dream garden and landscape. We collect the sample, package it, mail it to the lab and then we read the report and write a detailed analysis with exact directions on what to apply and when

Foliage Testing & Analysis

Trees and plants don't talk and tell us exactly what they need to be fertilized with. Many cases soil test may tell us and in some cases they won't. A very powerful tool in determining plant health is knowing the exact mineral content in plant tissue. We collect living tissue and send it to a lab and we can literally pinpoint the exact needs of the plant.
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