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


Plant Growth Regulators


When the wrong tree has been planted in the wrong place and is getting too large, plant growth regulators may be applied to dramatically decrease its growth rate.  These products are also used to treat stressed trees and trees with root damage.  By decreasing stem growth, the tree can allocate its resources to the production of defense chemicals and root development.



Trunk Injections


Occasionally, a tree cannot be fed by a traditional soil injection method.  This could be due to the fact that a tree has paved surfaces surrounding it or otherwise has inaccessible roots.  In these circumstances, we use micro-capsule trunk injections.  Also, in the rare occasion that a highly toxic pesticide is required, we recommend injection to avoid environmental exposure.


Preparing the next placement

Drilling the hole

Placement of tubing

Placement of the capsule

Tapping the capsule into the tubing

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.