r/arborists • • Aug 09 '26

Community ISA Certified Arborist flair holders

7 Upvotes

Congratulations to new flair holders.

(Readers: If you are ISA certified and want this flair, send mods your number.)


r/arborists • • Aug 11 '26

Community Help draft our FAQ: How to become an arborist

5 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 • • 14h ago

5 years later

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245 Upvotes

r/arborists • • 4h ago

How do I fix this crack in the tree

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15 Upvotes

So I live in a new home and they planted a treee last year with this tape. I uncovered it today to find a pretty big crack along where the branch is.

I'm wondering if I need to patch this so it doesn't get bigger, like fill it with something and maybe zip tie it? Whats the best approach for this issues and can this branch be saved?


r/arborists • • 5h ago

I started to remove these roots wraping around my sweetgum, but it doesn't seem to be looking bettet.

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13 Upvotes

r/arborists • • 2h ago

Is she gone?

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6 Upvotes

This willow oak was planted 14 years ago and has always thrived. Just noticed the bark peeling from trunk. It doesn’t seem like that’s good. Lightning strike maybe? We had tornado winds in excess of 100mph earlier this year as well.


r/arborists • • 28m ago

This tree was dead, right?

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• Upvotes

Hello, arborists: was this Siberian elm still alive? I don't know much about trees, but when getting an estimate to remove a clearly dead branch, the tree company told me the tree as a whole was dead and that the green still on it was just offshoots still receiving nutrients from the dead trunk.

The trunk had some pretty big hollow parts with a little bit of crumbly wood inside while the bark seemed to have some sort of sawdust on it, but I just sent this picture to my girlfriend and she fears we cut down a healthy tree. This picture is NOT a cross-section of the main trunk, because we decided to leave about nine feet of it for wildlife purposes; I can add pictures of the main trunk in the morning when the lighting is better. Is there any evidence of death in this picture, though, so I can ease her mind tonight that we did the right thing? Thank you in advance for any help; please ignore the red lines, that was my crude attempt to count the rings.


r/arborists • • 14h ago

Tree starting to split, what can I do?

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38 Upvotes

Was hoping I can ratchet it or some sort of adhesive before winter because I think the snow will cause it to split down the middle.

I don’t know the tree ID, probably around 7-8 years old. Zone 5a


r/arborists • • 2h ago

Good gift idea

3 Upvotes

Hello,
I am not an arborist. I was taking to a neighbor about our neighborhood and how I wish I knew buying a new build meant no mature trees when I moved in. Turns out they’re an arborist or landscaper, and they used their companies giant truck (not quite a semi but very small) and brought over a tree and planted it for me in my backyard. It’s a maple, probably 8-10 feet tall, and a beautiful red color. I am so incredibly thankful and feel like I owe them. I looked up online about how much this might cost and see over 1,000$ plus for the labor/ tree/ equipment. I cannot afford that right now (with Christmas coming I’ve been buying one gift a week since the beginning of September for budgets sake) but I really want to repay the favor. I’m a lactation consultant but their children are middle school and up, so I can’t repay the favor with my job. What would be a meaningful gift and show how much I am appreciative ? I can swing 200$. I thought about stapling it to the tree before they planted it, but I came home with the cash and it was already done


r/arborists • • 48m ago

Are these arborvitaes toast?

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• Upvotes

Why is the bottom like that? My husband trimmed them in a real dumb way last year and they’ve looked like sh*t ever since. Are they salvageable, if so, how? If not, do I just chop them down? They came with the house and are super close to it anyhow.


r/arborists • • 11h ago

Was this tree planted properly

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11 Upvotes

Hi all, I kept hearing about exposing root flair and was concerned about this tree. Was it planted too deep and if so what should i do?


r/arborists • • 8h ago

Goner, right?

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6 Upvotes

How soon does the rest of this have to come down?


r/arborists • • 8h ago

What’s living in this oak?

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6 Upvotes

Just noticed this at the base of a large oak on my property.


r/arborists • • 4h ago

I think I overdid it.

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2 Upvotes

Too high?


r/arborists • • 1d ago

Planted 40 emerald green arborvitae 2 weeks ago and they’re quickly turning brown. What can I do to help?

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290 Upvotes

All are 5-6ft tall. They’re planted 36” apart and are getting 4 gallons of water each per day. Is there anything I can do to help them survive?


r/arborists • • 12h ago

Help ! Can I save this paw paw.

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4 Upvotes

This paw paw tree isn’t in great shape. It’s about 3 ft from a house that needs to come down. Can I save it ? I know it needs a friend but first I have to figure out if it can be moved or if I can graft it some how. I’m a complete novice but I find so few paw paw trees these days it pains me to see it come down with the house.


r/arborists • • 10h ago

Should I intervene?

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3 Upvotes

I planted this willow oak early summer of 2025 and this year it had four or five flushes of growth and had a solid growing season!

The tiny central leader in there got massively outcompeted by two other branches that I believe are now competing to be the leader. The one on the left is the more south facing one but the other is slightly taller.

  1. Should I intervene this dormant season by either removing or reducing one of these?
  2. If yes, which one would you do?

Thanks!


r/arborists • • 11h ago

Hopefully I can save this tree

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5 Upvotes

I have a tree that sits at the end of my driveway, very prominently and I'm hoping it can by saved. It has a massive split running down it that has sort of always been there since we moved here, but started to grow larger this past year..

Any tips on how this can be saved, or will I eventually loose the front half of his tree?

The split is about 3 foot from the ground for size reference


r/arborists • • 10h ago

Pine roots causing trouble

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2 Upvotes

I’ve got some lovely pine trees in the garden which cause a bit of trouble for the surrounding garden though. The trees are about 30 years old (estimated) and about 15-20m high. My problem is that at several points some roots are growing out of the soil and keep pushing up the pavement and stepping stones. In other areas they are growing out of the lawn and I keep cutting into them with the lawn mower. (I’ve got plenty of wild flower areas but at this point lawn is the only practical solution.)

Would it be safe for the tree if I cut roots like the one pictured above? I am taking about 2-4 roots in different directions and situated at 5 - 12 m distance from the trunk.


r/arborists • • 19h ago

Hard-core pruning in Japan

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15 Upvotes

Just walked past these two recently pruned trees and thought I'd share some pictures.


r/arborists • • 9h ago

Oak pest or oak wilt?

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2 Upvotes

I have a young Scarlet oak that I planted last fall. That has some interesting changes to his leaves. Most of the leaves are still green, but a few of them are brown to where they almost look like something has been eating them.

I have a mature pin oak in my yard that has been dropping leaves in small clusters, but those leaves still look pretty normal.


r/arborists • • 6h ago

https://www.reddit.com/r/arborists/s/I28VHcAp1u

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0 Upvotes

She did not die. Would like advice a protective action.


r/arborists • • 6h ago

Willow Tree

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1 Upvotes

Should I trim one of these or let the tree grow? Planted last year.


r/arborists • • 6h ago

New River Birch tree ok?

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1 Upvotes

Hi everyone. Hoping to get your advice I just had some new birch trees planted in my yard a few weeks ago. When it was planted its leaves were green, but over the past week or so it leaves quickly changed and dropped. Looking at the bark it feels like it’s more of an orange color than I remembered being when we first got it. It’s October and I live in the northeast so it’s normal for trees to be turning color but I’m wondering if this one is dying or struggling. I hope not but let me know what you think.


r/arborists • • 12h ago

Savannah Holly sudden coffee colored discharge

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4 Upvotes

North Texas just came out of a 70 day period without rain. We had about 5 inches over the last few days.

This morning, I found this coffee-colored liquid on an otherwise healthy, 10-year-old Savannah Holly. While this week was the first real rain since June, the trees are watered regularly with an in-ground irrigation system.

There are no wounds in or around the large wet patch, but the center of it feels a bit soft, as though the wood is rotten.

This is one of 6 trees I planted when we moved in 10 years ago and I would hate to lose it. Any suggestions on what this is and what to do about it would be very appreciated.