Sycamore Tree: Three Unrelated Trees, One Name — and How to Tell Them Apart

“Sycamore” is not one tree. It is three, and they are not related to each other. In North America the word means Platanus occidentalis, a plane tree. In Britain and Ireland it means Acer pseudoplatanus — which is a maple. In the Bible and in ancient Egypt it means Ficus sycomorus, a fig. Three plant families, three continents, one shared name.

Almost every disagreement about sycamores comes down to two people describing different trees. This page settles which one you are looking at, and then sends you to the part of the site that answers your actual question.

The three sycamores at a glance

The London plane is not a footnote. In New York City there are more than 80,000 of them on the streets, about 13% of the entire street-tree population, and they are routinely sold and labeled as sycamores.

This is not a distinction invented here. The USDA Forest Products Laboratory, in its own technical sheet for Platanus occidentalis, has to stop and explain the clash before it can describe the timber: the common name “Sycamore” is used in England to designate a species in the Hard Maple Group (Acer pseudoplatanus), whereas Plane or Planetree is used to name the Platanus that grows there. When a United States federal wood-science laboratory needs a disclaimer about which tree it is talking about, the confusion is real. Arbitrating it is why this site exists.

Thirty seconds in the field: three checks that settle it

1. Look at how the leaves are attached to the twig. Opposite — two leaves facing each other at the same point — means a maple, and in Britain that is the sycamore, Acer pseudoplatanus. Alternate, staggered along the twig, means a Platanus or a fig. This is the one leaf character that reliably separates them.
2. Look at the fruit. Paired winged helicopters are maple samaras: Acer, never Platanus. Hard round balls dangling on a stalk are Platanus. Figs growing directly from the trunk and the heavy branches are Ficus sycomorus.
3. If it is a Platanus, count the balls per stalk — on several stalks. American sycamore normally carries one, occasionally two. London plane carries two, sometimes three. California sycamore (P. racemosa) carries two to seven in a chain. A single odd stalk proves nothing; the pattern across the whole tree does.

One test you will see everywhere that does not work: hairy leaf undersides. Both Platanus occidentalis and Acer pseudoplatanus are pubescent along the veins beneath the leaf, so it separates neither. The detail is in the guide to the sycamore leaf, with the same treatment given to sycamore tree bark and to sycamore seeds and seed balls.

Start here: pick the reason you came

I want to identify the tree in front of me

Begin at the sycamore tree identification hub, which walks the whole key in order. If you are trying to place a whole tree rather than a single part — the silhouette, and the way the bark runs brown and scaly at the base but near-white up in the crown — start with what a sycamore tree looks like. Then go to whichever part of the tree you can actually reach: the leaf, the bark, or the seed balls. The two comparisons that trip up most people have pages of their own: sycamore vs. maple and sycamore vs. London plane.

I already have one and it is causing me trouble

The care hub is the entry point. Blotched, curled leaves dropping in late spring are almost always anthracnose, which turns severe when the mean temperature in the two weeks after budbreak stays below roughly 55 °F (13 °C) — see sycamore tree diseases. For stippled, bronzed leaves in August, go to sycamore tree pests. For lifted paving, a blocked drain or a nervous conversation about the foundations, read managing sycamore roots near structures. And if the tree makes your eyes and throat feel gritty every spring, sycamore tree allergies explains why part of that is not an allergy at all.

I want to plant one

Read the distance table further down this page before you buy anything. Then compare the options in the sycamore species hub: the American sycamore for room and moisture, the Mexican sycamore for alkaline soil and heat, the London plane for a street or a hard urban site. If the yard is small, sycamores in small gardens makes the case against, honestly. When you are ready, there is where to buy a sycamore and how to grow one from seed.

I came because of the Sycamore Gap tree

The tree that stood in the dip on Hadrian’s Wall was an Acer pseudoplatanus — the British sycamore, a maple — not an American sycamore. It was felled on the night of 27–28 September 2023. The Sycamore Gap hub collects the whole story; who cut it down covers the investigation, the trial and the sentence; how old it actually was works through the ring count on the felled stem, which is far more interesting than the round numbers the press used. The species itself is covered in sycamore maple.

I came because of the Bible, or because of Egypt

That tree is Ficus sycomorus, and it is neither of the other two. It is the tree Zacchaeus climbed in Luke 19:4 — a fig with a short trunk and heavy, low, spreading limbs, which is exactly why a short man could get up it in a hurry. Start at the sycamore fig, then Zacchaeus and the sycamore tree. One correction worth carrying with you: in the Old Testament the sycamore is the cheap tree, the yardstick for what is ordinary and abundant (1 Kings 10:27, Isaiah 9:10), not a symbol of prosperity. The symbolism hub and the tree through history take it from there.

I have sycamore lumber, or a stack of it for the fire

The sycamore wood hub covers both species, because their timber behaves differently. American sycamore is a hardwood that measures 770 lbf on the Janka scale — softer than longleaf pine at 870 lbf, and both of those figures come from the same USDA laboratory, which is the cleanest way to show that “hardwood” is a botanical label and not a hardness rating. That argument is laid out in is sycamore a hardwood. Its interlocked grain is why it resists splitting, why it holds nails, and why quartersawing both stabilizes it and brings out the lacewood figure.

The American sycamore in numbers

These are the figures this site uses everywhere. Where the published sources disagree, the range is given rather than the flattering extreme.

How far from the house? The number this site is willing to commit to

This is the most consulted figure on the site and the one the wider web contradicts most freely. The same question gets answered with 10, 20, 50 and 65 feet on different pages, sometimes on the same page. Here is one set of numbers, used consistently:

And the honest version of why. Sycamore roots do not shoulder their way through sound foundations. The damage is indirect and it comes two ways: a large tree dries out clay soil, the clay shrinks, and the building settles unevenly; and roots find their way into drains and sewers that already had a crack or a loose joint. That distinction matters, because it tells you that soil type and the age of your pipework decide your real risk, not the tree alone. Managing sycamore roots near structures works through both cases.

Three things you will read elsewhere that this site will not tell you

• American sycamores do not make helicopter seeds. Platanus produces achenes packed into a hanging spherical head. The winged samaras that spin as they fall belong to maples. If your tree drops helicopters, it is not a Platanus, and half the identification advice you are reading does not apply to it.
• There is no female sycamore that skips the seed balls. Platanus is monoecious: male and female flowers on the same tree. Nurseries and articles that recommend a “female cultivar” to avoid the mess are recommending something that does not exist. The contrast worth knowing: eastern cottonwood is dioecious, which is exactly why cottonless male clones are sold. Sycamore has no equivalent.
• ‘Bloodgood’, ‘Liberty’ and ‘Columbia’ are London plane cultivars, not American sycamores. They are selected for partial anthracnose resistance — partial, and dependent on climate, never immunity. Buying one thinking you have bought a hardier American sycamore means you have bought a different tree.

Why the numbers here are the same on every page

This site is not written by a certified arborist and does not pretend otherwise. What it does is narrower and checkable: every measurement on it comes from one master data table, and every entry in that table is checked against the institutions that publish the primary work — the USDA Forest Service and its Forest Products Laboratory, university extension services including NC State, Clemson, UF/IFAS, Penn State, Oregon State and Utah State, the Morton Arboretum, Kew, the RHS, Forest Research and Historic England. Where two of them disagree, both figures are given and the disagreement is named.

That process has meant correcting things that circulate widely, including things this site itself once said:

• A visitor figure of “300,000 a year” for the Sycamore Gap tree is repeated across the web. There is no institutional source for it anywhere. It appears to have started on this site, and it has been removed. What is documented is the England Tree of the Year vote in 2016 and a grant spent partly on protecting roots exposed by foot traffic — a measure of pressure, not a headcount.
• Ancient Celtic folklore about the sycamore cannot be ancient. Acer pseudoplatanus reached the British Isles around 1500, and it has no old native name in any language of those islands.
• The London plane does not absorb pollution into its bark. Particles stick to the surface and are shed with the flaking plates. It is self-cleaning, not filtering.
• Hairy leaf undersides do not tell a Platanus from a sycamore maple, though a great deal of published identification advice says they do.

None of that makes this site an authority. It makes it a site that shows its work, on a subject where the name was borrowed twice over — lent to a European maple in the 1500s and again to a North American plane in the early 1800s, in both cases for nothing more than a broad, shady leaf — and where almost nobody stops to say which tree they mean.

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