r/arborists 21d ago

ISA Find an Arborist legacy directory is retired

11 Upvotes

ISA Certified Arborists need to read this!

ISA’s legacy Find an Arborist directory search tool on TreesAreGood.org was permanently retired yesterday, 30 June 2026. Directory information did not migrate to the new tool. Arborists certified or re-certified in recent months have a skeleton profile created by ISA. Everyone else has nothing. Of the 50 arborists nearest me only 5 (1 in 10) are in the new directory.

https://certificates.directory.isa-arbor.com/

Get in there, peeps. Claim your profile and add your contact details.


r/arborists 24d ago

Help draft our FAQ: how to find an arborist

3 Upvotes

This sub sees many of the same types of questions, prompting the same answers, again and again. So it begs for a FAQ. Dear reader, you can help.

How to find an arborist? Well, let's not harvest the tree before we plant the seed. So, what kind of arborist do you need? Your question really is How do I find the right kind of arborist for the work I need done?

  • Licensed. In most of the world arborists are not licensed. In the US only the states of Connecticut, Maryland, and New Jersey license arborists and arborists working in those states must be licensed. Many states license pesticide applicators and those states may also license anyone who offers advice about pesticides. Some counties and cities license arborists. Your county agricultural extension office can tell you about licensing requirements in your area.
  • Credentialed. The International Society of Arboriculture (ISA) bestows credentials based on a combination of years of verified experience, prior education, successful completion of knowledge and performance tests, and continuing education. These credentials are Certified Arborist (CA), Certified Arborist Utility Specialist, Certified Urban Forest Professional, Certified Tree Climber, Certified Tree Worker Aerial Lift Specialist, Board Certified Master Arborist (BCMA), and Tree Risk Assessment Qualification (TRAQ). The Tree Care Industry Association (TCIA) lists Accredited Companies and Accredited Utility Contractors (but many members have no accreditation). The American Society of Consulting Arborists (ASCA) recognizes Registered Consulting Arborists (RCA); to even join ASCA requires 5 years of verified experience.
  • Contractor. This word has multiple meanings. A state licensed contractor is an elevated class of business person, someone authorized to select and supply the materials to be used on your property, buy the materials at a wholesale rate, and charge you cost plus overhead on the materials in addition to their labor. Every state licensed contractor has a number that can be verified. Get the number and verify it. A contractor is anyone who does paid work and is not an employee. Therefore, the claim "licensed contractor" may indicate mere possession of a city or county business license. If there should be a business license, get that number and verify it too.
  • Bonded. Bonding is common among licensed contractors but not arborists. Bonds are a kind of insurance policy in the past was far more valuable than today. How they work is a service provider purchases a bond guaranteeing that if the provider causes damage the bondsman will pay the claim up to a certain limit. Today, business insurance is more important.
  • Insured. What kind of insurance, and how much, should an arborist have? That depends on the work the arborist does. Tree climbers and other aerial tree workers, or their employers, should have workers' compensation insurance (WCI). This is very important: in the event of an on-the-job injury or death WCI stands between the tree owner and the state. Tree worker is the single most dangerous occupation in the United States and each state employs expensive attorneys who specialize in recovering costs of injuries from those with legal liability. All arborists and arboricultural business should have general liability insurance, possibly also owned or leased business vehicle and business equipment insurance. Consulting arborists should have professional liability insurance also known as errors and omissions insurance. Clients should require a certificate of insurance (COI); in the US a COI comes on a standard form, the ACORD 25. The COI should list as an additional insured your name and the address where the work is to be done, the estimated date when the work is to be performed, and a brief but specific description of the work: not "services" or even "tree work" but "drop one (1) standing dead oak, 3 ft diameter, in front of house; remove all debris; repair damage to lawn." Better is a written estimate or contract, and the COI refers to that specific document.

Questions? Comments? What is missing?


r/arborists 9h ago

Help me understand

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230 Upvotes

Layman here. This stump looks to me like the bark grew up over the cut after the tree was cut (or over the wound after the tree fell). Is that possible? Wouldn't the tree just die after being cut/falling?


r/arborists 3h ago

Help my dad - is this a proper pruning cut?

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36 Upvotes

r/arborists 6h ago

Advice needed

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26 Upvotes

Bought a house 6 years ago with some woods behind. Previous owner had a zip line between two trees that we never used or really thought about. Noticed the cable around the trees digging in to the bark, I tried removing it but the bark has grown over the cable in spots.

Would I be doing more harm by removing some of the bark to get the cable out? Should I just leave it be? The tree appears to still be healthy

Edit: Thank you. I will try to cut it into pieces and remove as much as possible without damaging the bark


r/arborists 2h ago

Just mulched our cherry tree, anything to worry about long term?

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12 Upvotes

r/arborists 2h ago

RIP Ma and Pas mulberry tree

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7 Upvotes

Looks rotten on the inside?

Tons of free firewood, no mo pies tho.

Had some big storms up here last night, split her right in half. Power co is here now dealing with that wire, when theyre done, hope Pas ol chainsaw starts.


r/arborists 47m ago

The root flair has been relegated to hell

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Upvotes

r/arborists 1d ago

Volcanos everywhere

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219 Upvotes

Should I try to call the company that owns this plaza? Group of fresh mulch volcanos spotted the other day....


r/arborists 4h ago

Do I need to prune this root?

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3 Upvotes

Just planted the tree a month ago. It looks like it’s just part of the root flare, but the way it wraps down makes me worry about girdling. Also are the roots too exposed?


r/arborists 17h ago

Coastal redwood in Knoxville, TN

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42 Upvotes

An Interesting find on a random TikTok video haha. I’m surprised one was able to get that big. I thought Tennessee winters might be too unpredictable and cold for the coastal redwood, especially in East TN. However, this one seems to be surviving somewhat

I’m curious maybe the winters in East Tennessee are more stable compared to middle and west regions in Tennessee? Middle and West Tennessee might have more unpredictability in fluctuating temperatures during winter that can affect the survivability.


r/arborists 1h ago

Trim a spiny crepe myrtle tree without killing it?

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Upvotes

Is there a way to trim back this crepe myrtle without killing it? It's been here for nearly 30 years and the trees around it shade it. There are four in the back yard in similar states and I'd love not to have to remove them since they've been here for so long. They don't get 6 hours of full sun but they green up every year. Any thoughts would be helpful.


r/arborists 6h ago

Dying Ash Tree

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5 Upvotes

I think I know the answer… but this thing needs to be cut down, ya?


r/arborists 21h ago

Are the roots too exposed?

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79 Upvotes

I was told it was planted too deep so I removed some soil and exposed some of the roots. Does this look ok? Also wondering if these are girdling roots ☹️


r/arborists 2h ago

Did this Ash die from EAB?

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2 Upvotes

r/arborists 4h ago

River Birch placement

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3 Upvotes

Question about these river birches. New construction, these were all planted during building. The trees themselves seem healthy, they are heritage river birches. I like the trees themselves, but have done some reading about them messing up sidewalks and such. Wondering if these trees are going to be problematic, and it would be better to replace them with something before they get big? They're far enough from the house and the house is quite tall so not worried about foundation/gutter issues. But worried they might destroy this sidewalk, or even worse the concrete retaining wall to the left. That wall supports a fair amount of soil and my houses yard is about 6ft down from it so would be a big problem if it got damaged.


r/arborists 3h ago

Pretty sure I need to trim these

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2 Upvotes

We recently moved into a house and this is one of the trees in the back yard. The area around the trunk was originally heavily covered in soil and plants which we removed.

I’m pretty sure I need to trim these down/remove them. I’m just wondering two things: 1. Best time of year to do it and 2. Best method.

Moving into a 100+ year old house is expensive so we don’t have the $$ to hire a professional on this one - the “professional money” is going to fix things that would burn down the house if we tried to DIY it.


r/arborists 3h ago

how do i save this tree ??

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2 Upvotes

poison oak… and ivy … and probably many other things have completely overtaken this tree.
how do i fix this ??


r/arborists 1m ago

What’s happening to this Photinia?

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Upvotes

Middle of three photinias (I think?) suddenly started looking like this. I did some pruning to all three just after the spring bloom to let some light in the canopy, with the end goal of reducing the amount of overhang over the yard in a few seasons.

I noticed the middle photinia started looking odd last week. For context, I sprayed some 2-4d on the yard about a month ago to prep for over seeding in the fall, but was very cautious about over spray. No other plant has had a similar change.


r/arborists 11m ago

Will this bald cypress ever straighten itself out?

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Upvotes

It's at least 15 years old already and started leaning within the last five or so years.


r/arborists 21m ago

Peach borer prognosis

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Upvotes

My chokecherry tree looks to have peach borer damage. I found several empty pupas at the base, and the leaves suddenly became curled and crispy in the last couple of weeks. I’ve sprayed the base with permethrin, but I’m worried it is a lost cause. Any advice?


r/arborists 21m ago

Peach borer prognosis

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Upvotes

My chokecherry tree looks to have peach borer damage. I found several empty pupas at the base, and the leaves suddenly became curled and crispy in the last couple of weeks. I’ve sprayed the base with permethrin, but I’m worried it is a lost cause. Any advice?


r/arborists 50m ago

What do I do with my Ginkgo?

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Upvotes

Location: Tooele, UT. Planted it about a year ago. A late frost was making it look really sad this spring so we fertilized it, it grew way too many leaves and became really top heavy and ended up snapping in half. This basal stem popped up. Is it going to survive? Anything we should be doing to help it?


r/arborists 1h ago

Believe it or not, the rest of the tree looks healthy

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Upvotes

r/arborists 4h ago

In Sao Paulo, why?

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2 Upvotes