William Johnston & Co., Inc.

Phone: 610-664-3200


Services for Trees:


Tree Pruning


Tree Removals




Shrub Renovation


Emergency Storm Damage

Plant Health Care:


Spray Services: Insect and Disease Control


Fertilization Treatments and Soil Amendments


Plant Growth Regulator and Trunk Injections


Deer Repellant Treatments and Anti-desiccant Sprays

Evaluation Services:


Test Bore Evaluations


Hazardous Tree Evaluations


Root Crown Excavations

Contact us


Hazardous Tree Evaluations



Recognizing and reducing tree hazards in a suburban landscape not only creates a safer environment for you and your family, it can also reduce the liability associated with potential damage to neighboring properties.  Additionally, managing tree hazards can significantly improve the trees health and increase it's longevity.


The first step in evaluating a tree for potential hazards is the visual inspection.  When assessing a tree, it is important to distinguish a tree's biological health from tree structure.  Often, a tree may appear to be completely healthy with a full canopy of green leaves, yet is structurally unsound.  A tree can function biologically even though it has a major structural defect that may not always be obvious.  So, during a basic visual inspection, we evaluate the trunk, root flairs, site, species and architecture of the tree. 


The fungus at the base of this tree indicates advanced root decay.


From here, we can determine if the tree needs more diagnostic testing or would simply benefit from pruning and cabling.  Our goal is to educate the customer about structural conditions which may pre-dispose a tree to the risk of failure.


Bartlett Tree Experts

William Johnston & Company is proud to be a division of Bartlett Tree Experts, and our staff now has the backing of an international tree-care company and tree research laboratory to help continue providing excellent tree service and shrub care in the Philadelphia and Main Line areas. View a complete list of professional tree services offered by Bartlett.