# What old growth actually looks like

> Well under one percent of eastern forest is old growth. The six outward signs of an old tree, where old stands hide, and how to steer a woodlot back toward it.

Published 2026-09-15, updated 2026-10-24. Tags: Forests & habitat, Growth & age, Decay & damage. By Blue Whale Trees, a native tree nursery in the United States. Web version: https://bluewhaletrees.com/articles/what-old-growth-looks-like/

Ask most people to picture old growth and they describe a cathedral: huge straight trunks, an open floor, quiet and tidy. Real eastern old growth is close to the opposite: cluttered with dead wood, uneven in every direction, full of holes in the canopy and lumps in the ground. Many of its oldest trees are not its biggest. Old growth is a structure, not an age, and once you know the structure you can recognize it in a ten-acre woodlot as readily as in a national park.

![Massive old-growth eastern hemlock trunks rising through a dim forest in Cook Forest State Park](https://bluewhaletrees.com/img/articles/what-old-growth-looks-like-1-1000.jpg?v=5ea735dd "Old-growth hemlocks in Cook Forest, Pennsylvania: big trunks, but also gaps, snags, fallen logs and a canopy of many ages.")
*Photo: Nicholas T, [CC BY 2.0](https://creativecommons.org/licenses/by/2.0) ([source](https://commons.wikimedia.org/wiki/File%3AHeight_'n'_Width.jpg))*

## Old growth is a structure, not an age

A forest that [grew back on an abandoned pasture](https://bluewhaletrees.com/articles/old-field-succession/index.html.md) a century and a half ago is old, but it is usually not old growth. Its trees are all about the same age and size, and they have not yet begun to die in numbers. Old growth is what a forest becomes once the first generation starts to fall apart and the trees underneath start to take its place. The signs of an old stand are consistent from Maine to the Gulf coast:

- **Trees of many ages and sizes** mixed together, from seedlings to giants.
- **Big old trees with broken tops and huge limbs**, often with only part of the crown still living.
- **Standing dead snags**, often the largest trunks in the stand.
- **Large fallen logs in every stage of decay**, from fresh to moss-covered mounds you can push a stick through.
- **Pit-and-mound topography**: the hollows and humps left where windthrown [root plates](https://bluewhaletrees.com/articles/glossary/index.html.md#root-plate) tore out of the ground and rotted back into it. A floor that rolls like a rumpled blanket is old ground.
- **A broken canopy** with light gaps where trees have fallen, and dense young growth filling them.
- **A rich understory and deep litter and duff**, with [lichens and mosses on bark](https://bluewhaletrees.com/articles/lichen-and-moss-on-bark/index.html.md) and rock.

An untouched forest has all of this; a forest cut once long ago and left alone can have most of it. The structure is what counts, and it takes centuries of trees living, dying and falling in place.

![Moss-covered fallen trunk lying across the floor of an old-growth hemlock and pine woods](https://bluewhaletrees.com/img/articles/what-old-growth-looks-like-2-1000.jpg?v=52ab6db0 "A fallen trunk gone to moss in the Jakey Hollow Natural Area of Weiser State Forest, Pennsylvania, 59 acres of old white pine, hemlock, oak and hardwoods.")
*Photo: Nicholas_T, [CC0](https://creativecommons.org/publicdomain/zero/1.0/deed.en) ([source](https://commons.wikimedia.org/wiki/File%3AJakey_Hollow_Natural_Area_%28Summer_Revisit%29_%282%29.jpg))*

## How to spot an old tree

Old trees carry their age on the outside, and researchers who core them have written down what to look for. The best-known list, drawn from eastern hardwoods over 250 years old, names six signs on a single tree:

- **Balding bark.** Old oaks, hickories and gums lose their sharp bark ridges and turn smooth, plated or flaky, especially near the base and high up.
- **Low taper and twist.** An old trunk stays nearly the same thickness a long way up, and often spirals or curves rather than running straight.
- **Buttressed, hollow or lumpy bases**, with cavities where old limbs tore out.
- **Reiterated crowns**: small new crowns sprouting from big broken limbs, so the tree looks like a candelabra.
- **Stag-headed tops**: dead limbs poking above the living crown like antlers.
- **Very slow growth.** On a stump or a core, the rings are packed so tightly that a decade can fit under a fingernail.

![Lower trunk of a large old white oak with plated, flaking bark, autumn woods behind it](https://bluewhaletrees.com/img/articles/what-old-growth-looks-like-3-1000.jpg?v=bc250306 "The plated, flaking bark at the base of an old white oak in Matson's Woods, Northampton County, Pennsylvania, a seven-acre stand of oaks hundreds of years old.")
*Photo: Nicholas A. Tonelli, [CC BY 2.0](https://creativecommons.org/licenses/by/2.0) ([source](https://commons.wikimedia.org/wiki/File%3AMatson's_Woods_%28Revisited%29_%284%29_%2810636083235%29.jpg))*

The list tells you which trees are worth coring. It does not date anything by itself, and the researcher who assembled it says so:

> "While these characteristics and settings generally signal the potential for old trees, there is no guarantee that they represent old ages." (Neil Pederson, *External Characteristics of Old Trees in the Eastern Deciduous Forest*, 2010)

Size is a poor guide. Our [tree age calculator](https://bluewhaletrees.com/tools/tree-age/index.html.md?species=white-oak&grew=open) gives a range of ages for a trunk you have measured, from a good site to a poor one. Most of the oldest trees ever dated in the East are [smaller than you would expect](https://bluewhaletrees.com/articles/how-old-is-that-tree/index.html.md). Slow growth on a harsh site is what lets a tree [live so long](https://bluewhaletrees.com/articles/how-long-native-trees-live/index.html.md). Hollow trunks and shelf fungi [are not the end of the story](https://bluewhaletrees.com/articles/fungus-is-not-a-death-sentence/index.html.md). A stunted, twisted [black gum](https://bluewhaletrees.com/plants/black-gum/index.html.md) in a swamp or a [post oak](https://bluewhaletrees.com/plants/post-oak/index.html.md) on a ledge is a likelier ancient than the fat oak on the lawn.

![Old oak with a dense green lower crown and bare, dead, antler-like limbs rising above it, in a grassy cemetery](https://bluewhaletrees.com/img/articles/what-old-growth-looks-like-4-1000.jpg?v=d5d1d1e1 "A stag-headed oak in Plumstead Cemetery, London, on October 5, 2021: dead upper limbs stand above the living crown like antlers, one of the six signs of an old tree.")
*Photo: Marathon, [CC BY-SA 2.0](https://creativecommons.org/licenses/by-sa/2.0) ([source](https://commons.wikimedia.org/wiki/File%3AStag-headed_oak_in_Plumstead_Cemetery_-_geograph.org.uk_-_6987359.jpg))*

## How little is left, and where it hides

Surveys of eastern old growth put what remains at a fraction of one percent of the region's original forest, much of it in small, scattered pieces. What survives was hard to reach or not worth cutting: steep slopes and ravines, boulder fields and ridge tops, swamps and river islands, mountain coves the railroads never reached. A few groves were saved on purpose, among them Joyce Kilmer in North Carolina, Cook Forest in Pennsylvania, Congaree in South Carolina, and large tracts in the Adirondacks and the Great Smoky Mountains.

> "Yet today, less than 5% of Western and only a fraction of 1% of Eastern original forests, on average, remain standing." (Old-Growth Forest Network, *Why Old-Growth Forests?*)

Much of the rest is unknown and unmarked: town watersheds, the back corners of farms, cemeteries and church lots. It also survives along property lines nobody wanted to argue over and on ridges where the trees were too crooked to bother with. If you own woods on rough ground, walk them with the list above in mind, and if you want it to stay woods, there are [tools that outlive you](https://bluewhaletrees.com/articles/protecting-forestland-for-good/index.html.md).

## Why it matters

- **Carbon.** Old forests keep storing carbon for centuries, in the biggest trees and in soil that has been building under undisturbed litter the whole time. Cutting resets both.
- **Habitat.** Hollow trees and snags house owls, wood ducks, flying squirrels, bats and the woodpeckers that dig the holes everyone else uses. Big rotting logs feed fungi, beetles and salamanders that cannot live on twigs.
- **Genetics.** An old tree has survived every drought, ice storm and hard winter of the last few centuries on that ground. Its seed is [the proven local strain](https://bluewhaletrees.com/articles/seed-source-and-provenance/index.html.md), which is why we collect from known parent trees at Blue Whale Trees rather than wherever seed is cheapest.
- **Water.** Deep duff and pit-and-mound ground soak up rain and release it slowly, which is why [streams out of old forests run clear](https://bluewhaletrees.com/articles/why-reservoirs-are-surrounded-by-forest/index.html.md) when others run brown.

![Tall dead snag stripped of its bark, the pale wood splintered near the base, standing among bare trees on fallen leaves](https://bluewhaletrees.com/img/articles/what-old-growth-looks-like-5-1000.jpg?v=82b2299a "A dead snag shedding its bark on November 24, 2023. Hollow trees and snags house owls, wood ducks, bats and the woodpeckers that dig the holes others use.")
*Photo: Blue Whale Trees*

## Growing old growth back

No one can make old growth in a lifetime, but any second-growth woodland can be pushed that way, and the first steps are mostly about stopping things.

- **Leave the dead wood.** Snags, fallen tops and logs are the structure you are trying to build. Do not tidy them up or burn them.
- **Stop cutting the biggest trees.** Taking the largest and best-formed trees, the way most private woodlots have been logged for two centuries, removes exactly the ones that would have become giants. If you must cut, cut the small and the poor and leave the best.
- **Remove invasives.** Vines and shrubs from elsewhere [choke regeneration](https://bluewhaletrees.com/articles/invasive-vines-and-shrubs/index.html.md) and keep the understory from ever forming.
- **Protect regeneration from deer.** Where deer are dense, nothing reaches head height without [a fence or a cage](https://bluewhaletrees.com/articles/protecting-trees-from-animals/index.html.md), and a forest with no young trees has no future.
- **Let the gaps work.** When a tree falls, the light it lets in is the point. If nothing native comes up, plant local seedlings there; the [tree finder](https://bluewhaletrees.com/tools/tree-finder/index.html.md) narrows the list to species that suit the light and the soil of the gap.
- **Be patient.** The first hollow trees, the first big snags, the first shade-grown seedlings under the canopy arrive in decades; the rest takes generations. The woods you leave alone today are the old growth of a century from now.

![Rows of banded red-brown bracket fungi with pale edges crowding a dark, rotting log among fallen leaves](https://bluewhaletrees.com/img/articles/what-old-growth-looks-like-6-1000.jpg?v=8e5942cc "Bracket fungi on a rotting log on January 28, 2024. Snags, fallen tops and logs are the structure an old forest is built from, so leave the dead wood.")
*Photo: Blue Whale Trees*

## Common questions

### What makes a forest old growth?

Structure rather than age: trees of many sizes together, standing snags, big fallen logs at every stage of decay, pit-and-mound ground, and a canopy with holes in it.

### Is the biggest tree in the woods the oldest?

Usually not, because slow growth on a harsh site is what lets a tree live a long time. That is why a stunted black gum in a swamp is often older than the fat oak on the lawn.

### Is there any old growth forest left on the East Coast?

Yes, but well under one percent of the eastern forest, in small scattered pieces on ground too steep, too wet or too poor to be worth cutting.

### How can you tell if a tree is old?

Look for bark worn smooth or plated, a trunk that barely tapers, a stag-headed crown of dead limbs above the living ones, and growth rings packed tight on a stump. None of them dates a tree, but together they mark one worth coring.

## Sources

- [Why Old-Growth Forests?](https://www.oldgrowthforest.net/why-oldgrowth-forests): Old-Growth Forest Network: a fraction of one percent of the East's original forest remains, under five percent of the West's, and what the old-growth stage does that younger stands cannot.
- [Matson's Woods](https://www.oldgrowthforest.net/pa-matson-woods): Old-Growth Forest Network: the seven-acre stand of oaks hundreds of years old in Northampton County, Pennsylvania, in the third photograph.
- [Weiser State Forest wild and natural areas](https://www.pa.gov/agencies/dcnr/recreation/where-to-go/state-forests/find-a-forest/weiser/wild-and-natural-areas): Pennsylvania DCNR: the Jakey Hollow Natural Area, 59 acres of old white pine, hemlock, oak and hardwoods, in the second photograph.
- [External Characteristics of Old Trees in the Eastern Deciduous Forest](https://doi.org/10.3375/043.030.0405): Neil Pederson, Natural Areas Journal 30(4) (2010): the six outward signs of an old eastern hardwood, and their limits.
- [OLDLIST, a database of old trees](https://www.rmtrr.org/oldlist.htm): Rocky Mountain Tree-Ring Research: how old the oldest individuals really are.
- [People in the Floodplain](https://www.nps.gov/cong/learn/historyculture/history-culture.htm): National Park Service, Congaree National Park: the old-growth floodplain forest saved from renewed logging when Congress established Congaree Swamp National Monument in 1976.

## Related

- Next step: [Open the tree finder](https://bluewhaletrees.com/tools/tree-finder/index.html.md)
- [How old is that tree, really?](https://bluewhaletrees.com/articles/how-old-is-that-tree/index.html.md)
- [What grows back when a field is left alone](https://bluewhaletrees.com/articles/old-field-succession/index.html.md)
- [Fungus on a tree is not a death sentence](https://bluewhaletrees.com/articles/fungus-is-not-a-death-sentence/index.html.md)
- [Protecting forestland for good: conservation easements and the other tools](https://bluewhaletrees.com/articles/protecting-forestland-for-good/index.html.md)