Sycamore vs. Maple: 7 Key Differences in Leaves, Bark, and Growth Habits

Look at how the leaves join the twig. Staggered, one at a time — alternate — and you have a plane tree, Platanus, which is what Americans call a sycamore. In matched pairs facing each other — opposite — and you have a maple, Acer. No maple has alternate leaves. That single check works in every month of the year, including on a bare twig in February.

Then comes the part the rest of the internet skips. Ask this question in Britain and the answer inverts, because the tree the British call a sycamore is a maple: Acer pseudoplatanus. A British reader who says sycamore seeds are helicopters is right. An American who says they are nothing of the kind is also right. They are describing two unrelated trees that share a name.

The two-second test, and why it still works in winter

Pick up a twig and work back from the tip. On Platanus, the leaves — or in winter the buds and leaf scars — march up the twig one at a time, each offset from the last. On any maple they sit in exact pairs, one on each side of the twig at the same height. Side branches inherit the pattern, so even a broken twig on the ground answers the question.

Two confirmations if you want them. On Platanus the base of the leaf stalk is swollen and hollow and caps the bud beneath it like a hood, so when the leaf falls the scar runs right around the bud. Platanus also has no true terminal bud, and its side buds carry a single hood-shaped scale, reddish and resinous. Maple buds sit in opposite pairs and stay green all winter with dark brown scale edges. The full winter key is in our guide to sycamore tree identification.

One limit, stated plainly: alternate-versus-opposite separates sycamore from maple and nothing else. Oak, birch and cottonwood are alternate too.

Why the question has two answers, one per side of the Atlantic

"Sycamore" started out as the name of a fig — Ficus sycomorus, the tree of Luke 19:4 and of ancient Egypt. The name was then lent out twice, both times for nothing more than a broad, shady, vaguely fig-like leaf: in the 1500s to the European maple Acer pseudoplatanus, and in the early nineteenth century to the North American Platanus occidentalis. Neither transfer has any botanical justification, and both are still in daily use.

So "sycamore vs. maple" is really two questions. In the United States it pits Platanus against Acer — trees from unrelated families. In Britain and Ireland it pits one maple against the other maples, a far finer distinction. The USDA Forest Products Laboratory says as much in its own species sheet: in England, "sycamore" designates a species in the hard maple group, and the Platanus growing there is called a plane. That is an American federal laboratory arbitrating a British naming problem.

Settle the vocabulary first. If your source is British or Irish, sycamore means the sycamore maple. If it is American, it means the plane tree. Our overview of sycamore tree types lays out all three trees that carry the name.

The seven differences at a glance

Leaf shape: broad and shallow against deep and finely toothed

Once you have the arrangement, the outline confirms it. A Platanus leaf is big — 4 to 9 inches (10–23 cm) wide, and typically wider than long — with three to five lobes cut broadly and shallowly, and a base running from squared-off to heart-shaped. The veins radiate from a single point and stand out as ridges.

A sycamore maple leaf is smaller, 7 to 16 cm, with five lobes cut more deeply and edged with finer teeth, and a strongly heart-shaped base. Its leaf stalk runs 5 to 15 cm and is often noticeably red on young trees — a fast tell at eye level. The Platanus stalk reaches about 12 cm and ends in that swollen, hollow base. Our sycamore leaf guide takes the measurements species by species.

The hairy underside is not a discriminator, whatever the search results say

Plenty of pages tell you to turn the leaf over and check for hairs. Don't bother. Platanus occidentalis and Acer pseudoplatanus both have hairy veins underneath — the Woodland Trust lists it as a "look out for" feature of the maple, and NC State Extension describes the same pubescence on the sycamore. A test that comes up positive on both trees is not a test. Leaf arrangement is the real one; the hollow leaf-stalk base is second.

Fruit: a ball of achenes against a pair of helicopters

Platanus does not make helicopters. It packs hundreds of achenes — each about 8–9 mm long, with a ring of bristles at the base — into a dense spherical head roughly an inch across, hanging from a long stalk. On the American sycamore there is normally one head per stalk, occasionally two, so check several before resting an identification on it. The heads brown in fall, hang on all winter, and crumble into wind-borne fluff in spring, which is why the mess in the yard arrives in March and April rather than October.

Maples make samaras: two seeds, each with a papery wing, joined at the base. On sycamore maple the pair sits in a closed V of about 60 degrees, wings 1 to 2 inches long; on Norway maple they spread almost horizontally. If it spins on the way down, it is a maple. Full detail on sycamore seed balls.

This one also matters in a paddock. Sycamore maple seeds and seedlings contain hypoglycin A, the cause of atypical myopathy in horses — frequently fatal, and most concentrated in seeds in fall and early winter and in seedlings in spring. Platanus carries no such toxin and is not on the ASPCA's list of plants toxic to dogs; its seed balls are a mechanical hazard, indigestible fiber, not a chemical one.

Bark: white camouflage against small gray flakes over orange

Sycamore bark is the most photographed thing about the tree and the most misread, because it is zoned from the ground up. At eye level the trunk is brown to red-brown, loose and scaly — which is why people look at the base, see nothing special and walk on. Higher up, the plates come away in a gray, tan, olive and white mosaic, and in the upper branches the bark is smooth and close to pure white. Look up, not at the base. More in our guide to sycamore bark.

Sycamore maple bark is gray and smooth when young, then flakes in much smaller, irregular plates that expose an orange to red-brown inner layer. Same idea, entirely different scale and color.

Fall color settles it in October

This is the most underused test of the lot. Platanus does not do fall color. The leaves go a dull yellow, then brown, then drop. Maples do, and loudly — yellow, orange, often red. If you are standing under a big lobed-leaf tree in mid-October and the canopy is glowing, you are not under an American sycamore.

Size, habitat, and how close you can plant them

The American sycamore is a bottomland tree of eastern North America, at home on riverbanks and floodplains. It grows 2 to 3 feet (60–90 cm) a year — and, unusually, keeps growing fast for its whole life rather than only when young — reaching 75 to 115 feet (23–35 m) with a crown of 65 to 100 feet. That crown width is the number that decides whether it fits a property.

Sycamore maple is a European tree, planted in Britain from about 1500 and now listed there as an invasive non-native. It manages 12 to 24 inches (30–60 cm) a year and settles at 40 to 60 feet (12–18 m) in cultivation, crown 8 to 15 m. It shrugs off lime soils and salt-laden coastal wind, which is why it lines Scottish and Irish shelterbelts; in the United States it has naturalized in New England, the New York area and the Pacific Northwest.

For siting, keep Platanus occidentalis at least 40 feet (12 m) from house foundations — 60 feet (18 m) on clay or over a basement — and 50 feet (15 m) from drain runs. Sycamore maple wants 8 to 12 m. These roots do not push sound foundations apart: the damage is drying of clay soil, which causes differential settlement, and root entry into pipes that already had a crack. More in our notes on sycamore trees in landscaping.

Wood: the maple is the harder of the two

Sycamore is genuinely a hardwood in the botanical sense, but it is not a hard wood. On the Janka side-hardness test the USDA Forest Products Laboratory puts American sycamore at 770 lbf — below longleaf pine, a softwood, at 870. Sycamore maple comes in at 1,050 lbf and hard (sugar) maple at 1,450. We work through that confusing category in is sycamore a hardwood.

They also do different jobs. Sycamore has interlocked grain — fibers spiraling in alternating directions — so it resists splitting from nails and screws, which is why it became the wood for butcher blocks, brush handles and food containers. Maple is the instrument wood: rippled sycamore maple, the figure called fiddleback, has been used for violin backs, ribs and necks since the mid-sixteenth century.

Two more trees that get caught in this comparison

If your tree has maple-shaped leaves and spiky balls, it is neither. It is almost certainly sweetgum (Liquidambar styraciflua), whose star-shaped leaves have five to seven sharply pointed lobes and whose seed capsules are woody and spined; a sycamore ball is smooth-surfaced and crumbles into fluff, a sweetgum ball stays hard and hollow for months. And if you are separating two maples: red maple (Acer rubrum) has smaller leaves with sharper lobes than sycamore maple, whose leaves are larger, broader and more rounded. There is no species called a "red sycamore" — the phrase gets typed into search boxes, but it does not correspond to a tree.

So which one do you have?

Leaves in pairs means maple, full stop. Leaves staggered along the twig means Platanus — then confirm with the hollow, hood-shaped leaf-stalk base and the white bark high in the crown. On a bare tree the buds keep the same pattern, and seed balls still hanging in January are a sycamore's. In October, a canopy on fire is a maple. And keep an eye on the word itself: in American English it means the plane tree, so the answer is "unrelated trees"; in British English it means a maple, so the honest answer is "the same kind of tree." Both are true, which is exactly why so many pages about this contradict each other.