Prescription Pruning
At Gregory Forrest Lester, Inc., we believe trees deserve the highest level of care. That’s why our team recently completed the Prescription Pruning Qualification (PPQ) — an advanced credential developed by the International Society of Arboriculture (ISA) and based on the research of Dr. Ed Gilman, a leading authority in tree biology and structural pruning.
What is Prescription Pruning
2015-2017
Prescription Pruning is a modern, science-based approach to tree pruning.
Instead of relying on preference or habit, every cut serves a specific purpose:
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Strengthen tree structure
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Improve health and longevity
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Enhance clearance and safety
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Reduce risk of limb failure
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Maintain natural beauty
This is more than just trimming branches. It is tree-care with purpose.
Knowledge + Skill on EVERY job
We invest in everyone who touches your trees:
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ISA Certified Arborists who write the pruning plan (Prescribers)
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Production arborists who perform the work (Producers)
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This ensures the plan and the pruning match perfectly, resulting in better outcomes and healthier trees.
Prescription Pruning emphasizes clarity, accountability, and responsible pruning decisions.
It creates a shared language between the prescriber (who specifies the work) and
the producer (who performs the cuts).
2007-2010
New Standard in Pruning
Meet our ISA Prescription Prunners
To ensure your trees always receive informed, science-based care, we recently trained 12 of our arborists through ISA’s Prescription Pruning program, strengthening the expertise available on every job site.
A Higher Standard for Our Community’s Trees
By selecting professionals trained in this credential, homeowners are supporting:
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Safer urban forests
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Reduced long-term maintenance costs
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Trees better adapted to built environments
Our goal is simple:
Stronger, healthier trees that thrive in the spaces where we live and work.
