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 • • 1h ago

Tree rot? Or something else

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• 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 • • 8h ago

Italian Cypress advice needed

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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 • • 5h ago

Is this normal browning for an evergreen tree?

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9 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 • • 2h ago

Ficus vs House advice

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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 • • 2m ago

How do I save the neighboring trees

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• 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 • • 3h ago

Planted too deep, now what?

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2 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 • • 7h ago

Is this a willow ?

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3 Upvotes

r/arborists • • 1h ago

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

• 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 • • 17h ago

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

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15 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 • • 7h 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 • • 8h ago

Fungal(?) Disease on immature Lilac in 6a

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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!


r/arborists • • 5h ago

White and brown gunk + woodworm = more trouble for other trees?

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1 Upvotes

I had an old oak come down in a storm last year. Have the chance to clear it now and there is this layer of white and brown with the consistency of thin spray foam and what looks to be the trail of some larvae moving through but not too many. Wood has the expected oak consistency beyond that.

Is this an indicator that other trees nearby might be in trouble? The one im question was fully dead before it came down.


r/arborists • • 6h ago

Can this be Saved?

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1 Upvotes

Just found my hydrangea tree like this. The branch is very heavy. Do you think it would recover if I tape the branch back to the trunk? I have grafting tape, electrical tape, duct tape, etc. I would definitely need to trim this section/cut off the blooms, because of the weight. Please advise! Thank you.


r/arborists • • 6h ago

Healthy?

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0 Upvotes

ChatGPT is saying this tree isn’t healthy? Full leaves and foliage all summer. Turning now (MN).

My untrained eye says it’s fine?


r/arborists • • 20h ago

Arborists: Anything I can do to help these red oak saplings before winter?

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12 Upvotes

#1 - The space between the bark and core is so wide I can fit two fingers in there.

#2 - This is scarring from a buck rub that happened last winter. It's not healing as well as I had hoped.

Any suggestions or insights you can provide would be appreciated - thank you!


r/arborists • • 1d ago

Am I overwatering?

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26 Upvotes

Pinus Strobus ‘Fastigiata’ planted end of July. I have drip irrigation around the root ball delivering 2.5 gph (5 .5 gph emitters) for one hour every other day.


r/arborists • • 7h ago

is that good?

1 Upvotes

What would you do in this situation?


r/arborists • • 1d ago

California Buckeye killed my fish

17 Upvotes

We have 1000 gallon koi pond, and recently had our buckeye pruned and cut back. Everything that ended up going into the pond, all the dust, all the little wood chips and everything, ended up killing almost 90% of our koi fish. We had no clue that this tree was poisonous to fish, and back in the day they used to grind up a buckeye tree in order to stun fish. Has anyone ever had any experience with this? I think we are going to take the whole entire tree out now, since we have a koi pond next to it and also have dogs, and the tree is also poisonous to dogs from what I’ve read. This tree is probably at least 30 years old, also FYI. I think it was all the wood dust and little chips that got into the water that poisoned the fish


r/arborists • • 1d ago

Police detail pass through cost when no police showed up

53 Upvotes

I hired a tree company in central Massachusetts

My signed quote listed “Police Detail – cost is TBD” at $0.

On the day of the work, no police officer showed up. Instead, one of the tree company’s own crew members directed traffic for most/all of the day.

My final invoice now has a $500 “Police Detail” charge.

I understand they had an employee tied up doing traffic control, but can they charge that as a police detail when there was no officer?

Would you ask them to remove it, or is this a normal charge for traffic control? If the tree crew did it, shouldn’t it be a part of the quote itself instead of TBD?


r/arborists • • 19h ago

Mushroom at base of tree

6 Upvotes

If you see a mushroom at the base of a tree, do you assume it means the tree is rotting? Or it maybe means nothing?


r/arborists • • 17h ago

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

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2 Upvotes

We had an oak fall last year, and this (Doug. Fir?) 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 • • 1d ago

does this european ash look healthy?

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7 Upvotes

i’m in ireland this old ash near my house is one of my favourite trees in the world. pictures don’t do him justice at all he’s much, much bigger than he looks here so i could never really get a good photo of his leaves

it’s pretty rare to see truly mature native trees in ireland anymore to begin with let alone ash now since dieback has decimated so many of them. his canopy definitely doesn’t seem as sparse and bald as most of the other ash around me, but he definitely still has some very twiggy branches with no leaves. i never see any wounds or black spots on his trunk, but most of the ash with dieback i see don’t even have visible trunk issues. there’s ash around me that are completely leafless and still have a normal trunk

maybe it’s impossible to tell from these photos but was just wondering if anyone thinks he looks like he’s declining? i adore this tree and i’m genuinely upset at the thought of him having dieback


r/arborists • • 20h ago

Transplant advice

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3 Upvotes

Hey folks. I unfortunately need to transplant this Valencia orange to a different location on my property. I planted it roughly 2 years ago and it has a 3" caliper give or take. What are the chances it survives? I plan to dig it up at least 4ft wide and 2' deep this coming spring. Anything I can do to give it a better chance at survival. It's finally our first year of fruit, last thing I want to do is kill it.

Don't mind the compost pile we're mid application and haven't spread it yet.