By Chris Ahlum
I’ve spent most of my life in the arboriculture industry and have climbed the ranks from a tree climber to the head of Ahlum & Arbor Tree Preservation. After all these years, I still get questions about the work we do and how we help people. Questions like, “What is an arborist?” and “Do I really need one?” If you’re unfamiliar with the difference between a tree trimmer, a landscaper, and a certified arborist, you’re not alone. That’s exactly why I want to set the record straight about what an arborist really is and why hiring one can protect your trees and property for the long haul.
What Does a Certified Arborist Do?
In simple terms, an arborist focuses on the care and keeping of trees. Our focus is on maintaining the health and longevity of trees. Our years of expertise help us nurture them rather than opting for the easier route of cutting them down.
Most people think a landscaper or any “tree guy” can take care of their trees. Arborists typically know about the health biology and science behind the trees. We also have the proper certifications to ensure the necessary knowledge and experience.
Here are two key certifications to look for:
ISA Certified Arborist
- Has at least three years of experience
- Has passed a comprehensive exam on tree care
- Demonstrates a solid understanding of tree growth and maintenance
Board Certified Master Arborist
- Typically has over eight years of experience
- Possesses an advanced and extensive knowledge of tree biology and care
- Represents the highest level of certification in the field
We’ve discussed what an arborist is and what they do, but what is an arborist not?
What Arborists Don’t Do (And Why That Matters)
Arborists Versus a Tree Removal Company
We’re often compared to tree removal experts, however, this is not a fair comparison as arborists focus on the overall health of a tree. Tree removal companies do serve an important purpose as they focus on cutting down and hauling away trees in certain situations.
There are times when the safest option is to remove a tree, but that isn’t always the case. Many people think they need to remove trees because they are big or seem too large – but in reality, if a tree has good structure and has been maintained, it can live a long and healthy life while remaining safe.
Fly-by arborists will say a tree needs to be removed because it may have some decay or they see dead branches, but a large, mature tree will likely have a few dead branches and decay to some extent. The biggest thing to look out for is to make sure that decay is not overly large or in a place that could cause significant structural issues.
Another misconception is that if a tree looks healthy and green, then it’s safe. A tree’s cambium active vascular tissue is towards the outside of the wood of the tree vs towards the middle of the tree. A tree could be green and look healthy but be completely hollow and a hazard.
Arborists Versus a Landscaping Company
I often hear people refer to us as a landscaping company, but that’s also a common misconception. Landscaping companies don’t specifically handle caring for trees. Their focus is solely on the design aspect of an outdoor space, such as garden maintenance and lawn upkeep.
A lot of times we are used as consultants before large landscape renovations or house renovations. We can help determine what trees can and should be saved vs ones that can’t. We can also consult on how the new landscape or grade changes will affect existing trees.
Arborists can often see things that most homeowners or property managers can’t see. We can also help put together a management plan to keep trees healthy and happy or put a plan together to get them to be healthier and safer.
Some tree removal and landscaping companies have certified arborists on staff that offer more comprehensive care. So an arborist can be a tree remover, but not all tree removers are arborists.
While we do consider ourselves to be tree doctors, we are not tree huggers. An arborist will make cuts to trees to help them thrive, but we don’t cut for the sake of cutting. The goal is to keep the natural shape of the tree and maintain its health. It’s about ensuring that every cut is an aesthetic and natural enhancement. Our approach combines the art and science of tree care, emphasizing the beauty in preserving nature.
When Should You Hire an Arborist?
Many homeowners wait until a storm hits or a tree starts dropping limbs before calling in a professional—but certified arborists are most valuable before problems arise. Here are some of the best times to hire an arborist:
When You Move Into a New Home
If your property has mature trees, it’s a good idea to schedule a tree health assessment. An arborist can spot structural issues, hidden disease, or risky limbs before they cause damage.
When You’re Considering Pruning or Removal
Not all overgrown or leaning trees need to be removed. A certified arborist can determine if preservation-focused pruning can restore health and reduce risk—saving the tree and saving you money.
During Home or Landscape Renovation
Major changes to your landscape—like new patios, driveways, grading, or drainage—can impact nearby trees. Arborists help protect root zones, recommend trees to preserve, and guide plant health care during construction.
When You Notice Something Off
If you see:
- Unusual leaf color or early leaf drop
- Dead limbs or hollow-sounding trunks
- Fungal growth near roots or on bark
- Sudden leaning or cracks in major branches
…it’s time to call a certified arborist for a professional evaluation.
Proactive care is always cheaper and safer than reactive cleanup. If you’d like expert eyes on your trees, reach out. Our ISA Certified Arborists specialize in preserving the value and safety of your trees for the long term.