Tree risk management is about more than just reacting to storm damage—it’s about understanding what’s happening inside your trees before problems appear.
How decay hidden inside trees can lead to costly damage—and what can be done to prevent it.
Following on from our recent blog, “Why Tree Safety Matters,” we now ask the next big question: when it comes to trees and storms, are you reacting—or preparing?
In our work, we see both ends of the spectrum.
Reactive tree management often means dealing with the aftermath—fallen trees, damage, and risk to public safety.
Proactive tree management focuses on early intervention, using tools like the Arborsonic 3D Tomograph to detect internal decay before it becomes a problem.
Both photos tell the same story—what’s going on inside a tree matters just as much as what we see from the outside.
The Cost of Being Reactive
It’s easy to assume that a healthy-looking tree is a safe one. But many trees fail without any visible warning. Decay often starts inside the trunk or major limbs, weakening the structure long before cracks or dieback appear.
Being reactive means dealing with damage after the fact:
- Clearing fallen trees
- Paying for repairs to footpaths, fences or buildings
- Facing potential safety claims
It also means losing trees that could have been saved—or at least managed more safely—if we’d acted sooner.
Photos from the walkthrough with IrishTrees.ie at Dunsany Nature Reserve Co. Meath, Ireland, assessing storm damage after Storm Éowyn.
What Proactive Tree Risk Management Looks Like
Proactive tree care isn’t about cutting down trees. It’s about gathering the right information early—so you can make balanced, site-specific decisions before a problem arises.
At Holly Arboriculture, we take a strategic approach to tree risk management. That means more than just inspections—it means working closely with landowners and site managers to develop a practical, long-term plan that balances safety, conservation, and the value of trees on site.
A tree risk management strategy typically includes:
- Initial site assessment – understanding tree locations, usage zones, and risk exposure
- Prioritising high-use or vulnerable areas – such as footpaths, car parks, accommodation blocks, or schools
- Categorising trees based on condition, location, value, and potential risk
- Recommending actions – from monitoring and selective pruning to decay detection or removal
- Planning re-inspection intervals – so that trees are managed over time, not just once
- Creating a record of care and due diligence – especially important where there’s legal or public responsibility
This strategy becomes a living document that evolves with the site. It helps site managers make informed decisions, allocate budgets sensibly, and demonstrate a clear duty of care when it matters most.
This approach helps:
- Avoid unnecessary tree loss
- Reduce costs linked to emergency works
- Support safety for public, staff, and guests
- Preserve landscape value and biodiversity
Tools like acoustic tomography support the strategy—but the real value lies in the thinking behind it. Knowing why you’re assessing a tree, what the risk is, and what options are available is what turns a one-off inspection into an effective long-term plan.
Introducing Acoustic Tomography: Tree Decay Detection in Action
When a tree shows signs of concern—or when a site contains high-value or high-risk trees—we can use the Arborsonic 3D Acoustic Tomograph.
This non-invasive tool uses sound waves to detect decay inside the tree. It creates a coloured cross-section image showing areas of healthy wood, decay, and cavities.
Paul Holly using the Arborsonic 3D Acoustic Tomograph to assess internal tree decay during a site inspection in Dunsany Estate in collaboration with Irish Trees.ie.
What this means in practice:
- Trees don’t need to be cut open or damaged to be assessed
- Results are immediate, visual, and easy to interpret
- Decision-making is backed by data, not just observation
This technology helps us identify which trees are genuinely at risk—and which can be retained safely with the right care
3D tomograph map displaying the internal health of a tree, with colour-coded sections indicating areas of sound wood, decay, or structural weakness.
Who Should Be Thinking Proactively?
If you’re responsible for a site with a lot of trees, proactive tree safety isn’t just good planning—it’s a responsibility.
This includes:
- Private estates and castles
- Hotels and guest accommodation grounds
- Golf courses and parks
- School campuses and public spaces
If a tree falls and causes injury or damage, questions will be asked. Being able to demonstrate that your site had a tree risk management plan in place can make all the difference.
Learn more about the basics of tree safety here
Where Has This Worked?
We’ve already seen this proactive approach make a real difference for our clients—preventing tree failure, reducing emergency call-outs, and saving money by targeting the right interventions at the right time.
You can visit our Case Studies section to see how this work is being applied on estates, hotels, public parks, and infrastructure projects across Ireland.
Be Proactive, Not Reactive
Based in Cork, we work with clients across Ireland to help them make informed, confident decisions about their trees. If you’re managing a site with mature trees and want to reduce risk and avoid unnecessary loss, get in touch here.
