Silver maple vs red maple: how to tell them apart

Seeds and flowers in early spring

Both maples flower on bare twigs and drop their seeds by early summer, so spring is a good time to compare them.

• Flowers. The USDA Forest Service's Silvics of North America calls silver maple among the first maples to bloom, as early as February, continuing into May, before the leaves. Its dense clusters are greenish to reddish. Red maple flowers from March to May, according to the red maple Silvics, usually several weeks before its leaves open; its small hanging clusters are usually bright red, occasionally yellow.
• Seeds. Silver maple samaras are the largest of any native maple, with wings spreading 1 1/2 to 2 1/2 inches, Virginia Tech says, and the Forest Service adds they are the largest seeds of any US maple. Red maple samaras are only 1/2 to 3/4 inch long, light brown or reddish, on long slender stalks. Both ripen from April to June and can germinate as soon as they fall, which is why both sprout in lawns and gutters.

A pile of oversized "helicopters" under a tree in May points to silver maple. The helicopter seeds guide compares them with ash, elm and other winged seeds.

Twigs, buds and bark in winter

Without leaves, start with the twigs. Virginia Tech describes silver maple twigs as thicker than red maple's and often more chestnut-brown, with reddish brown buds wearing large scales. Two marks are hard to miss:

• The smell. Crushed silver maple twigs give off an unpleasant odor. Red maple twigs don't.
• The flower buds. On silver maple they sit in conspicuous dense clusters along the twig. Red maple's buds are blunt, green or reddish, with several loose scales, and its twigs are reddish and shiny with small lenticels.

Bark starts the same on both: smooth and light gray. With age, silver maple breaks into long, thin strips loose at the ends, which the Morton Arboretum describes as curling upward at the ends. Red maple darkens and splits into long, fine, scaly plates; Virginia Tech calls silver maple's bark similar but coarser. For other trees you can name from twigs alone, see the winter tree identification guide.

Shape, site and fall color

Step back and look at the whole tree. Silver maple usually has a short trunk that splits low into several subtrunks, with long, slender branches that sweep downward and then curve back up at the tips. Red maple grown in a forest keeps a trunk clear of branches for a good distance; in the open it has a shorter trunk and a rounded crown.

Where it grows also helps. The Forest Service places silver maple on stream banks, floodplains and lake edges, where it tolerates temporary flooding better than most of its neighbors. Red maple is far less fussy: it grows from dry ridges to peat bogs and swamps, and in the far South it is almost purely a swamp tree. A big maple on a dry hilltop is more likely red than silver.

Fall color is a hint, not proof. Morton describes silver maple turning yellow-green, while the Forest Service calls red maple's brilliant fall color one of its outstanding features, reddest in the north. A blazing red tree is more likely red maple or a Freeman hybrid; a silver maple rarely turns scarlet.

Freeman maple: the hybrid in between

Red and silver maple hybridize naturally, and their flowering periods overlap, according to the Forest Service. The cross is called Freeman maple (Acer × freemanii), and nurseries sell selections of it widely; the best known is marketed as Autumn Blaze. Oregon State University's Landscape Plants describes its leaves as variable and intermediate between the parents, with seed wings longer than red maple's and shorter than silver maple's. Autumn Blaze itself has deeply cut, five-lobed leaves like silver maple and orange-red fall color like red maple.

The same page notes that leaf measurements could not reliably separate the hybrid from its parents. In practice, a young maple planted along a street or in a new subdivision, with silver-maple cuts and red-maple fall color, is quite likely a Freeman maple cultivar. A maple in a floodplain forest is more likely one of the parents, though natural hybrids occur there too.

Why the difference matters

For a yard, the difference is practical. The Morton Arboretum lists weak wood and branch structure for silver maple, with limbs that break in wind and ice, vigorous roots that can invade sewer pipes, and seedlings that come up in lawns and gardens; it adds that many authorities recommend against planting it. The Forest Service notes the same brittleness and roots that clog drain lines that aren't tightly sealed. Red maple is the steadier tree, though it seldom lives longer than 150 years; silver maple may pass 130.

For syrup, both can be tapped, but neither matches sugar maple. The Forest Service reports that silver maple had the lowest sap sugar of five maple species tested in Ontario. The red maple vs sugar maple page compares the tree most people would rather tap.

If you identify maples with Tree Identifier, a photo of a leaf turned to show its underside, or of a seed cluster, gives the app the most to work with. The result shows no confidence score or alternative species, so use the twig smell and seed size above to confirm it. Red maple is part of the app's 138-species Collection; silver maple is not.