#root flare

Tree care #2

These are some very satisfying examples of Root Flare on trees; they look great, they are healthy, and this is exactly how all trees flares should look like. If you see a big tree coming straight up from the ground, with no root flare showing, like this:

then know that this tree is planted too deep, it’s root flare is not getting the air exposure and oxygen it needs; this tree will get very sick and won’t be able to live as long. 

Root flares are supposed to be above the ground level, these are not roots, they need to be kept dry, not covered in soil or mulch, or they’re susceptible to rot. Once the tree starts rotting, she can still stay alive, but unhealthy. However, these trees can be saved! There are teams going on missions to dig out the root flare, and this will help the tree to gain back health. Not enough people do that tho, so if you see a big tree without any root flare showing, consider getting your hands dirty and digging around to see if there’s any flare you can free up. Your tree will love you and look beautiful and healthy. Healthy trees can live forever.

Source (click to watch a video of more examples and explanations, male narration tho)

Look at those trees. I was staring at them today and I honestly can't tell what their deal is. They might even be just one tree, that at some point fell down, and then decided, eh this works too, and just kept growing. Because what tree would intentionally grow like this? But then the one in the background is just the same, half-horizontal, half-tree.

I feel like it might be related to the area they're growing on; this place gets heavily flooded, and it's all mud and clay, so I assume the roots and trunks got unstabilized due to waterflow, then figured out a way to keep still when the flood comes – by simply having the tree lie down.

Look at that trunk flare tho! All the tips of roots are visible above the soil, they look so cool, and this is actually a great thing. All trees should have the root flare visible, because this part of the tree is supposed to be above the soil level, and it needs exposure to oxygen, it could easily rot if trapped underground. When you see a tree that just starts vertically with no roots visible, that is a tree that will get sick if not helped.

I can't tell how these will do but I love them very much, they are coping, and other people love them too. Those pieces of wood you see in the front—that's a table, the flood water took away the top plank. People like to come and have a picnic there! Here's a bonus pic of how this place looks in the summer.

1: Correct planting trees:

2. Correct pruning:

3. Trunk Flare exposure (trunk flare is the part between the bark and the roots!)

I'd heard the term root flare a handful of times over the years without ever really stopping to think about it. It came up again this spring when a neighbor mentioned her landscaper had "found the flare" on an old maple like it was some kind of buried treasure. That stuck with me enough that I finally spent a Saturday afternoon this summer checking my own trees.

I have three mature trees in my yard that matter to me: a maple near the driveway that's probably older than the house, a big oak in the back corner, and a dogwood closer to the patio that my kids used to climb on as toddlers. None of them looked sick exactly, but none of them looked amazing either, and I wanted to rule out something basic before I started worrying about anything more serious.

What Root Flare Even Means, in Plain Terms

The root flare is the spot where the trunk widens out and turns into roots at the base of the tree. On a healthy tree it should be visible, like the base of a bell or the bottom of a wine glass, not a straight pole disappearing into the ground. When soil or mulch piles up over that spot for years, the bark down there stays wet and the roots underneath can't breathe the way they're supposed to.

I read through some material from Rutgers' NJAES before I started, mostly because I wanted to know what I was actually looking for instead of just guessing. Their planting and tree care guidance walks through why a buried flare matters and what a normal one should look like, which gave me enough confidence to go outside and actually start digging.

The Three Trees I Checked This Summer

The Maple by the Driveway

This is the tree I was most worried about, since it's the oldest one on the property and the trunk has always looked a little strange right at ground level. I knelt down, brushed away the top layer of mulch and leaf litter with my hands, and right away could tell the trunk just kept going straight down with no visible widening.

I used a small garden trowel to dig a shallow ring around the base, maybe four or five inches out from the trunk in every direction. About three inches down, I finally hit the spot where the wood started to flare outward into what were clearly structural roots. Three inches doesn't sound like much, but apparently that's enough to trap moisture against bark that was never meant to stay wet.

Photo by Gustavo Fring on Pexels

The Oak in the Backyard

The oak surprised me in a good way. When I pulled back the mulch there, the flare was sitting right at the surface, clearly visible, no digging required. I think whoever mulched it years ago actually knew what they were doing, or maybe the tree just never got the thick mulch treatment the maple did.

I still probed around it a little with a thin wooden stake just to double check nothing was hiding under a layer of compacted soil instead of mulch, since those aren't always the same problem. Nothing came up. That tree gets a pass for now.

The Dogwood Near the Patio

The dogwood was the trickiest because it's smaller and younger, so I wasn't sure how much taper to expect in the first place. I ended up comparing it loosely to photos and descriptions from Trees Are Good, which has some accessible explanations of what a normal young flare looks like versus an older established one.

Turned out the dogwood had about an inch of soil sitting over the flare, likely from a landscaping bed that got built up around it a few summers back. Not dramatic, but worth fixing while it's still an easy fix rather than waiting.

What Actually Surprised Me

The biggest surprise wasn't finding a problem, it was how differently my three trees had ended up despite getting roughly the same yard care for years. I'd assumed if one tree had a buried flare they probably all would, since the same mulch and the same landscaper touched all three. That wasn't the case at all.

The other surprise was how little digging it actually took to find the answer. I went in expecting I might need to dig down six or eight inches on some ancient buried mystery. In reality, most of what I found was within the top few inches, which apparently is pretty typical since re-burial tends to happen gradually through years of mulch top-ups rather than one dramatic mistake.

The Simple Steps I Used, Anyone Can Do This

I'm not an arborist and I didn't need any special tools for this. Here's the actual process, in order, if you want to check your own trees.

Step 1: Clear the Area Around the Trunk

Start by pulling back mulch, leaves, and loose soil in a ring a few inches out from the trunk on all sides. Use your hands or a small trowel, and go slow so you don't nick the bark.

Step 2: Look for the Natural Widening

With the surface cleared, look at where the trunk meets the ground. You want to see a gradual flare or taper, not a straight pole going into the dirt with no transition at all.

Step 3: Probe If You Don't See It Right Away

If the flare isn't visible, take a thin stick or a garden trowel and gently probe downward right against the trunk. You're feeling for the point where solid trunk wood gives way to the softer texture of roots.

Step 4: Note the Depth and Move On to the Next Tree

Once you find it, note roughly how many inches down it was. An inch or two buried is a simple fix. Four or more inches, especially on an older tree, is worth getting a second opinion on before you start digging around structural roots yourself.

Step 5: Photograph What You Found

I took a quick photo of each trunk base before and after clearing it, mostly so I'd remember what I actually saw a few weeks later. It also turned out to be useful when I wanted to describe the maple situation to someone else without them having to come look at it in person first.

Photo by Tatsiana Sa on Pexels

When I Decided to Call in a Professional

I felt fine handling the dogwood myself since it was only an inch of soil and a young tree with a small root system. The maple was a different story. Three inches of buried flare on a mature tree with structural roots I couldn't fully see felt like something worth getting actual eyes on before I started pulling soil away from roots I didn't fully understand yet.

I looked around locally and ended up talking to Hufnagel Tree about the maple specifically, since I wanted someone who actually works on trees in this area to weigh in before I did anything more than the initial check. That conversation was useful mainly for confirming I wasn't overreacting, and for getting a sense of how careful the excavation around an older tree's roots really needs to be.

For anyone dealing with something similar, the ISA's arborist directory and educational material is a decent starting point if you want to understand what a certified arborist actually checks for beyond just the flare itself. It helped me go into that conversation with better questions instead of just describing "a weird bump in my yard."

What I'd Tell a Neighbor Doing This

Do the easy trees first. Checking three trees only took about ninety minutes total, and two of the three either had nothing wrong or had a fix simple enough to handle with a trowel and twenty minutes of careful digging.

Don't assume uniform yard care means uniform tree health. My three trees told three different stories despite years of the same mulch and the same landscaping routine. Also, don't skip the research step. Reading through material from sources like the USDA Forest Service on urban tree care before I started gave me a much better sense of what "normal" was supposed to look like, so I wasn't just guessing at every trunk I dug around.

Quick Checklist for Your Own Trees

Clear mulch and soil in a ring around the trunk base

Look for a visible widening where trunk meets roots

Probe gently with a stick or trowel if the flare isn't obvious

Note how many inches deep you had to go

Handle an inch or two yourself if you're comfortable

Get a second opinion locally before excavating deeper or older buried flares

Recheck every year or two since mulch and soil build back up over time

A few of us on the street got to talking last month after one neighbor had a landscaper out to look at a maple that had been dropping branches for two summers straight. What started as a conversation about that one tree turned into all of us walking up and down the block comparing trunks. It was a little unsettling how many of our trees looked the same way once we knew what to look for.

What We Noticed Walking the Block

None of us are arborists. We're just people who have lived here long enough to remember when some of these trees were staked saplings. What we noticed, once someone pointed it out, is that almost none of the mature trees on our street had a visible base anymore. The trunks just went straight down into the lawn or the mulch bed like a fence post, with no flare, no visible roots, nothing.

That's not how a tree trunk is supposed to look. A healthy trunk should widen out where it meets the ground, almost like the base of a wine glass, before the roots spread outward under the soil. On our street, most of them looked like poles.

Photo by Stephen McDaniel on Pexels

What a Root Flare Actually Is

The root flare, sometimes called the root collar, is the transition zone where trunk tissue becomes root tissue. It's built to handle open air and sunlight, not constant moisture and darkness. When that zone stays buried under soil, mulch, or turf for years, the bark there behaves very differently than it would above ground.

Groups like the International Society of Arboriculture describe this zone as one of the most important indicators of a tree's long-term health, precisely because it's so often overlooked during routine yard maintenance. It's not flashy. Nobody notices a buried root flare the way they'd notice a cracked branch or a dead patch of leaves.

Why It Disappears Underground

On our street, it wasn't one dramatic event that buried these trunks. It was small, ordinary yard habits repeated for twenty or thirty years. A little topsoil added here to fix a low spot. A fresh layer of mulch every spring that never quite got raked back before the new layer went down. A regrading job when someone put in a patio or a new lawn that quietly raised the soil level around an existing tree by a few inches.

Add that up over two or three decades and a tree that started life with its flare fully exposed can end up with six or eight inches of buried trunk. Nobody did it on purpose. Most of it happened during projects meant to make the yard look better, which is part of why it's so easy to miss.

Decades of Small Decisions Add Up

One of the neighbors on our street pulled out old photos from when the house was built in the early 1990s, and the young trees in the background clearly showed a visible base and surface roots. Compare that to today, and the same trees now look like they're standing in a bowl of soil. That side-by-side was the moment it clicked for a lot of us.

It's a strange thing to realize that lawn care, the very thing meant to keep a yard looking cared for, can be part of what slowly damages a tree. Nobody grading a yard or topping off a mulch ring is thinking about what's happening at the trunk six inches below the new soil line.

Why This Matters for a Tree's Health

A buried root flare doesn't kill a tree overnight, which is exactly why it's so easy to ignore for so long. Bark that isn't meant to sit in damp soil starts to break down. That creates an entry point for decay fungi and gives insects an easier way in. Roots that should be spreading outward and downward sometimes start growing up and around instead, because the buried trunk essentially confuses the tree about where the surface actually is.

The U.S. Forest Service has published research on urban tree stress factors, and root and trunk issues tied to poor planting or grading depth show up again and again as contributing causes of premature tree decline in yards and along streets. It's rarely the single cause of a tree dying. It's more like a slow tax on the tree's health that eventually adds up alongside drought stress, storm damage, or old age.

Girdling Roots and the Slow Squeeze

A related problem some of us found once we started digging a little near our own trees is girdling roots, roots that circle around the base instead of growing outward. Over years, a girdling root can literally strangle the trunk as both grow in diameter. It's easier to spot and correct early, before the tissues fuse together, which is part of why catching a buried flare sooner rather than later actually matters.

Rutgers Cooperative Extension has useful material on woody plant root problems for New Jersey soils specifically, which are heavier clay in a lot of Monmouth County yards and don't drain the way sandier soils do further south. That clay tendency is part of why buried flares seem to be such a common issue around here in particular.

What We Did With What We Learned

A couple of neighbors decided to carefully pull back mulch and soil from around their trees' bases themselves, using a soft brush and their hands rather than a shovel, to avoid nicking bark or roots. For anyone with a tree that looks seriously buried, several inches down or more, one of us reached out to a local arborist to get an actual opinion before doing any digging, since removing soil incorrectly around an already stressed tree can do more harm than good.

That felt like the right call. A few inches of loose mulch is a weekend project. A tree that's been buried for two decades with visible decay starting at the base is a different situation, and it's worth having someone who does this professionally take a look before anyone starts digging around root tissue that might already be compromised.

What Homeowners Can Check This Weekend

Anyone curious about their own yard doesn't need special tools to do a first pass. Walk up to the base of a mature tree and look for where the trunk widens before it goes straight down. If you can't see any widening and the trunk looks like a post stuck in the ground, that's worth a closer look.

Pulling back a couple inches of mulch by hand near the trunk, without digging, is a reasonable first step. If the flare shows up once the top layer is gone, it's likely just a mulch buildup issue. If you pull back mulch and still see straight trunk going into soil with no widening, that points toward an actual grading or burial problem that mulch alone didn't cause.

The Arbor Day Foundation has straightforward homeowner guidance on proper planting depth and mulching that's worth a read even for trees that have been in the ground for decades, since a lot of the same principles apply to correcting an existing problem as apply to planting a new tree correctly.

Where to Learn More

None of us are claiming to be experts after one afternoon of comparing trunks up and down the block. What changed is that we now actually look at the base of a tree instead of just glancing at the canopy and assuming everything underneath is fine. Trees are patient about showing damage, which is exactly what makes something like this easy to live with for years before it becomes obvious.