TREE RISK ASSESSMENT

Tree risk assessment is the practice of evaluating the health and stability of your trees to prevent potential hazards. It is a vital process that identifies risks such as weak branches, root issues, or diseases that could lead to a tree falling or shedding limbs unexpectedly.

There are several methods to assess tree risk, each suited to different scenarios. Let us explore these methods together.

Visual Tree Assessment is the most basic and cost-effective method. It involves inspecting the tree from the ground, looking for visible signs of damage or disease.

• Routine checks: Regular inspections help catch potential issues early.
• Initial assessments: Ideal for spotting surface-level symptoms.

• Pros: Quick, easy, and affordable.
• Cons: May miss hidden issues not visible from the ground.

Personal Anecdote: I recall a time when a homeowner was worried about a leaning tree. A simple VTA revealed that the lean was natural and posed no immediate threat. Often, a tree that has responded to a lean is less likely to fall over than a tree that is standing straight.

Basic Tree Risk Assessment takes it a step further, using tools like mallets and binoculars for a more thorough inspection.

• Before major projects: Essential before starting landscaping or construction projects.
• Detailed inspections: When a visual inspection raises concerns.

• Pros: More detailed than VTA and still relatively affordable.
• Cons: Might not detect deep internal or root issues.

Project Example: We once helped a homeowner save tens of thousands of dollars in city fines by submitting a TRA to determine a large street tree didn’t pose a significant risk. It needed some pruning and monitoring, but removal was unnecessary.

This method employs specialized equipment like resistographs and tomography to look inside the tree, revealing hidden decay or structural problems.

• High-value trees: For trees that are significant to your property.
• Complex issues: For trees showing serious symptoms needing a detailed diagnosis.

• Pros: Highly accurate and detailed.
• Cons: More expensive and requires professional expertise.

Personal Anecdote: We once utilized a Resistograph to help a homeowner work with their builder. By identifying root health, we modified the design to protect a significant tree on the property line, preserving both the tree and neighborly goodwill.

Aerial inspections use drones or climbing arborists to examine the upper parts of the tree not visible from the ground.

• After storms: To check for high-up damage.
• For large trees: When the canopy is dense and hard to inspect from below.

• Pros: Provides a comprehensive view of the entire tree.
• Cons: Can be costly and requires specialized equipment.

This method involves removing soil around the base of the tree to inspect the root collar for decay or other issues.

• Suspected root issues: When poor growth or leaning is noticed.
• High-traffic areas: Ensuring root stability is crucial for safety.

• Pros: Reveals hidden root problems.
• Cons: Time-consuming and may disturb the landscape.

Personal Anecdote: We once uncovered severe root decay near a playground. By catching this early, we safely removed the tree, preventing a potential tragedy.

• Tree species and size: Different trees have different risk factors.
• Location and accessibility: Trees in hard-to-reach places might need more specialized methods.
• Budget and resources: Consider what you can afford and the tools available.
• Specific concerns: Visible damage, recent storms, or changes in tree health.

Sometimes, combining methods provides the best assessment. For instance, a VTA might reveal issues that warrant a more detailed TRA or advanced assessment.

While DIY assessments can be helpful, consulting a professional arborist ensures accurate and comprehensive results. Arborists have the training and tools to properly assess and address tree risks.

Project Example: One client was worried about a tree leaning toward their house. After a thorough assessment combining VTA and advanced tools, we found it was safe but needed pruning. The homeowner was relieved and happy with the peace of mind.

• Assessment Method: VTA
• Outcome: Regular visual checks showed no significant risks. Simple pruning kept the trees healthy.

• Assessment Method: Advanced Tree Risk Assessment
• Outcome: Detailed internal checks identified early decay in one tree. Timely intervention saved the tree and prevented potential damage.

• Assessment Method: Root Collar Excavation
• Outcome: Discovered root issues before they became critical, ensuring the safety of the area and the health of the trees.