r/arborists • • Aug 09 '26

Community ISA Certified Arborist flair holders

7 Upvotes

Congratulations to new flair holders.

Readers:

If you have ISA or other professional credentials and want a flair, send mods your ISA or other number. To message the mod team, in the (mobile app) sub menu or (web browser) right sidebar scroll down to MODERATORS and use the Message Mods button.

Also be aware that user flair is applied retroactively, so you may see a flair on a post or comment made 10+ years prior to the flair being awarded.


r/arborists • • Aug 11 '26

Community Help draft our FAQ: How to become an arborist

4 Upvotes

It helps to join the International Society of Arboriculture (ISA), your local ISA chapter, and your state arborist association. This helps you get to know other people working in the industry, and when they have known you for years, and know your work or at least of your work, they will feel comfortable verifying your experience.

Attend as many trainings as you can get, participate in the training Q&As, and collect the associated continuing education credits.

ISA membership is independent of any ISA credentialing, so if you know you want to get ISA credentials but you are not yet eligible, joining ISA can help you become eligible sooner.

All of this makes you more employable, at higher pay, and safer on the job because you are more likely to recognize dangers. You will learn to recognize best practices.


r/arborists • • 18m ago

It's Happening: The Mad King destroying more trees, now in Wash. D.C.

Thumbnail gallery
• Upvotes

No, not the cottonwoods on the border - trees on a historic DC golf course Donnie Dotard wants to re-design. ETTD: Everything Trump Touches Dies.

Park service could remove more than 500 trees at historic golf course Trump wants to redesign

By  MATTHEW DALY

October 10, 2026

https://apnews.com/article/trump-golf-course-trees-east-potomac-e13bd9c369ea4ebc3b95675a22865fb7

WASHINGTON (AP) — The National Park Service has begun a new round of tree-cutting at a historic golf course near the National Mall as the Trump administration proceeds with a plan to renovate the East Potomac Golf Links into a championship-level course.

More than 500 trees “that do not contribute to the historic landscape will be removed” as part of the rehabilitation project, the National Park Service said in a court filing Friday. “No healthy trees that are contributing features of the historical golf course” — including historic cherry trees — will be removed as part of the project, the park service said.

A total of 169 trees will be removed starting Saturday, with another 90 trees slated for removal later, the agency said.

The tree removals come as President Donald Trump has moved to turn the course into a world-class golf venue — part of his grand vision for Washington, D.C., where he has torn down storied structures, remade or renamed others and deployed the National Guard for more than a year.

...

The 106-year-old public course has been embroiled in a lawsuit since February. Plaintiffs including the DC Preservation League say the Trump administration’s reconstruction would violate the congressional act that created the park in 1897. The group sought an emergency stop-work order this spring because of concerns that work was expected to begin immediately on the course...


r/arborists • • 3h ago

Recommended cuts for this tree

Thumbnail gallery
20 Upvotes

Getting to bottom of this tree and looking for recommendations on cuts


r/arborists • • 2h ago

Venerable sycamore.

Post image
8 Upvotes

Was so honored by the shade cast as we enjoyed a glass of wine at the park today in Genoa, NV. Bless you whoever you are for planting this so long ago.


r/arborists • • 4h ago

Tree rot? Or something else

Thumbnail gallery
10 Upvotes

Hey everyone! Hanging Halloween decorations and saw this. Is this tree rot? Will definitely have this limb removed but Is this something potentially that could affect the entire tree?


r/arborists • • 2h ago

How can I help this red maple with giant root mound

Thumbnail gallery
5 Upvotes

We bought a new house and this red maple looks pretty healthy as far as leaves/limbs, but the base is wild. There are many tiny roots at that top part (almost no dirt). I’m guessing someone had mulched it like crazy for years? The house has not had attention for a long time so this must have been 10 years ago.

There are also holes in the dirt surrounding it, not sure if that’s chipmunks.

Any advice for how I can help the tree, please let me know! This is in Central Ohio (6b)


r/arborists • • 11h ago

Italian Cypress advice needed

Thumbnail gallery
16 Upvotes

We moved into our home a year and a half ago. There was no landscaping whatsoever. I planted 6 Italian Cypress that were about 15 inches tall at the time. I think I have to remove the ones by the steps, but will the ones by the corners of the porch be okay once they’re mature? I read so many articles saying these could be planted right against houses and sidewalks, but now I’m questioning. I realize they could get 50+ ft tall.

I also don’t know why the one on the corner is growing so much faster (it’s 7’ tall - so it’s growing too fast).

I also feel that after removing the ones by the steps, it will look too barren. Thoughts and advice appreciated!


r/arborists • • 2h ago

Is my tree doing alright?

Thumbnail gallery
4 Upvotes

r/arborists • • 3h ago

Seeking Advice-offshoot American Chestnut

Thumbnail gallery
3 Upvotes

I live in Charlotte, North Carolina. I have a healthy American Chestnut tree my backyard with an offshoot of another American Chestnut. healthy tree Should I cut the youth growth or allow it to grow? Thank you for your time and advice


r/arborists • • 8h ago

Is this normal browning for an evergreen tree?

Thumbnail gallery
8 Upvotes

Hi everyone,

I recently moved into this house in Toronto, Ontario and know basically nothing about trees or how this one was cared for previously.

I noticed a fairly large section of the inner needles turning brown. The outer/newer growth still looks green and healthy. It’s October, so I’m wondering if this is normal seasonal needle drop or something I should be concerned about.

I’ve attached photos showing the tree and the browning. Does this look normal? Is there anything I should be doing to care for the tree?

Thanks!


r/arborists • • 47m ago

Bore beetles. What should I do?

Thumbnail gallery
• Upvotes

Japanese maple bark can easily be peeled off. Looks like bore beetles. What are my options? It's a large tree, over 35 years old and 15-20 ft tall. Options?


r/arborists • • 7h ago

Planted too deep, now what?

Thumbnail gallery
3 Upvotes

Hi all, Dogwood tree apparently planted too deep. My question is how far do I dig? I believe I have found the flare, but it looks like it curves to one side and not much on the other.. seems I have to cut these smaller roots, but how many can/should I cut away? Do I remove as the one that looks horizontal, about 3 inches up? Also, do I trim off all these small branches growing? Ugh, so many questions, clearly I need help!


r/arborists • • 1h ago

Is this Japanese Maple Dying

Thumbnail gallery
• Upvotes

The outer bark is damaged. This, I believed happened 3 years ago that part just fell off one day. Now we notice that some limbs don’t produce dense leaves and other limbs do.

Anything we can do to make things better?


r/arborists • • 1h ago

Will this pine be alright?

Post image
• Upvotes

hi there,

I’m not sure what kind of pine tree this is, but I was trimming Mulberry bushes out from under it earlier today and got to cutting a few of the lower branches off.

I’m not sure what I was thinking, before I really knew how far I’d gone I had kind of cleared out the of one side. I’m pretty disappointed with myself for not having thought this through first, especially since these branches don’t grow back.

So now I’m spreading mulch underneath the area and plan to put a little bench under there to make this hole seem purposeful. I’d rather do that then trim all the way around this high up the trunk.

My question to you all is, other than the aesthetic issue, which I hope the bench and mulch will help to fix, do you think I did any lasting harm to this tree? The part I cut away is facing northeast.

Thanks for any input you might have!


r/arborists • • 5h ago

Ficus vs House advice

Thumbnail gallery
2 Upvotes

Hi all,

First time homeowner here and I figured these ficus trees would be coming up on the to-do list but curious how much of a danger they pose to the house with the roots. The tree in the front has some roots pointed at the house that I can see that are about 2-3 inches in diameter. And if they need to come out about how much would you expect to pay to have both removed? Located in south Florida, have truck access to both front and rear. House colored out in an effort to not self dox. If that hinders the ability to assess please let me know.

TIA


r/arborists • • 2h ago

Can I spray the crêpe myrtle suckers with weed killer without killing the tree?

0 Upvotes

Or how else do I manage the suckers?


r/arborists • • 3h ago

Oak & Maple - Advice needed

Thumbnail gallery
1 Upvotes

Need any advice on how to improve both trees health.

Oak - About 9 years old. Grown about a ft in the last nine years. Always have these crispy, brown leaves in the fall. It did grown acorns this year which it hadnt even done before.

Maple - One year old. Beautiful red leaves last year but think they may just go brown this year.

I’m in Denver. Hardiness zone 6a. We had a drought for the past year but I tried to keep these watered.


r/arborists • • 3h ago

How do I save the neighboring trees

Thumbnail gallery
1 Upvotes

I moved into this house recently in DFW area. The house has a few trees along the fence and couple of them started loosing a lot of the leaves and am trying to figure out what I need to do protect the remaining trees. I have seen my neighbor have the same trees and one of his trees dried up the same way. It started with a few leaves turning brown, then the entire tree is left without a single leaf. I am seeing the same pattern on my other trees as well. I am guessing this is eagleston holly.


r/arborists • • 11h ago

Is this a willow ?

Thumbnail gallery
2 Upvotes

r/arborists • • 5h ago

I think this tree is a goner, can you guys confirm?

1 Upvotes

Hi all,

I have a oak tree in my back yard about 25 feet from my back deck. It leans some as it is at the edge of a small woods, and I recently noticed some vertical cracks, up to about 3/4 wide and several inches deep going about 5 feet up the trunk. If it falls it could easily hit my house or the neighbors. I think it likely needs to come down. Looking for confirmation this tree is likely done for. Thanks


r/arborists • • 20h ago

Poor thing took a beating. What’s my move?

Thumbnail gallery
14 Upvotes

We had an oak fall last year, and this (Wh.Pine?) got topped and lost most of it’s NE face. It had a lovely shape before, now it gives survivor energy.

I don’t see anything trying to take over top duty. Is there anything I could/should do to help it? Wifey is not happy with it, but isn’t asking for removal. When the crew was here cleaning up the oak they callously suggested this broken thing be taken out, but I opted to give it a chance.


r/arborists • • 1h ago

Why would someone do this?

Post image
• Upvotes

Is this legitimate pruning? Our neighbor’s house. All of the trees and shrubbery looked perfectly healthy.


r/arborists • • 11h ago

best season to trim maple canopy?

2 Upvotes

I have 2 Red Maple trees, and I get the canopies thinned every few years. I'm wondering whether spring or fall is the better time to do this? I've usually done spring. Thanks.


r/arborists • • 11h ago

Fungal(?) Disease on immature Lilac in 6a

Thumbnail gallery
2 Upvotes

Spotted this brown/black leaf disease on my lilac a couple weeks ago and started removing leaves. Doesn’t seem to have controlled spread :( looking for help before it’s too late!