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


Cabling of Trees



During the inspection of a tree, an arborist's job is to detect structural defects.  Among them is something called co-dominance.  This arises when two or more equally proportioned main stems grow from a single trunk and form an acute, v-shaped crotch area.  Over time, compressed bark will form a fissure which leads to a weak area of attachment.  These sites are potential areas for failure during wind and snow storms.  To reduce the risk of splitting, we install extra high strength steel cables in the crown of the tree.  This physical support system dramatically increases the stability of the tree.



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.