Acer saccharum, the sugar maple or rock maple, is a species of maple native to the hardwood forests of eastern Canada, from Nova Scotia west through Quebec and southern Ontario to southeastern Manitoba around Lake of the Woods, and the northern parts of the Central and Eastern United States, from Minnesota eastward to the highlands of the eastern states. Sugar maple is best known for its bright fall foliage and for being the primary source of maple syrup.

Bark Seasonal leaf color change A pair of samaras

Acer saccharum is a deciduous tree normally reaching heights of 25–35 m (80–115 ft), and exceptionally up to 45 m (148 ft). A 10-year-old tree is typically about 5 m (16 ft) tall. When healthy, the sugar maple can live for over 400 years. The leaves are deciduous, up to 20 cm (7.9 in) long and equally wide,[4] with five palmate lobes. The basal lobes are relatively small, while the upper lobes are larger and deeply notched. In contrast with the angular notching of the silver maple, however, the notches tend to be rounded at their interior. The fall color is often spectacular, ranging from bright yellow on some trees through orange to fluorescent red-orange on others. Sugar maples also have a tendency to color unevenly in fall. In some trees, all colors above can be seen at the same time. They also share a tendency with red maples for certain parts of a mature tree to change color weeks ahead of or behind the remainder of the tree. The leaf buds are pointy and brown-colored. The recent year's growth twigs are green, and turn dark brown. The flowers are in panicles of five to 10 together, yellow-green and without petals; flowering occurs in early spring after 30–55 growing degree days.

Sugar maple Sugar maple foliage Acer saccharum Marshall Native range of Acer saccharum Flowers in spring

The sugar maple will generally begin flowering when it is between 10 and 15 years old. The fruit is a pair of samaras (winged seeds). The seeds are globose, 7–10 mm (9/32–13/32 in) in diameter, the wing 2–3 cm (3/4–1 1/4 in) long. The seeds fall from the tree in autumn, where they must be exposed to 90 days of temperatures below -18 °C (0 °F) to break their coating down. Germination of A. saccharum is slow, not taking place until the following spring when the soil has warmed and all frost danger is past.[7][need quotation to verify] It is closely related to the black maple, which is sometimes included in this species, but sometimes separated as Acer nigrum. The western American bigtooth maple (Acer grandidentatum) is also treated as a variety or subspecies of sugar maple by some botanists.

The sugar maple can be confused with the Norway maple, which is not native to America but is commonly planted in cities and suburbs, and they are not closely related within the genus. The sugar maple is most easily identified by clear sap in the leaf petiole (the Norway maple has white sap), brown, sharp-tipped buds (the Norway maple has blunt, green or reddish-purple buds), and shaggy bark on older trees (the Norway maple bark has small grooves). Also, the leaf lobes of the sugar maple have a more triangular shape, in contrast to the squarish lobes of the Norway maple.[citation needed]. The bark of the two trees is not similar at all.

Although many people think a red sugar maple leaf is featured on the flag of Canada, the official maple leaf does not belong to any particular maple species; although it perhaps most closely resembles a sugar maple leaf of all the maple species in Canada, the leaf on the flag was specially designed to be as identifiable as possible on a flag waving in the wind without regard to whether it resembled a particular species' foliage.

Sugar maple-yellow birch forest, Jacques-Cartier National Park, Quebec, Canada

The sugar maple is an extremely important species to the ecology of many forests in the northern United States and Canada. Pure stands are common, and it is a major component of the northern and Midwestern U.S. hardwood forests.

Sugar maple is native to areas with cooler climates. In northern parts of its range, January temperatures average about -18 °C (0 °F) and July temperatures about 16 °C (61 °F); in southern parts, January temperatures average about 10 °C (50 °F) and July temperatures average almost 27 °C (81 °F).

Acer saccharum is among the most shade tolerant of large deciduous trees. Its shade tolerance is exceeded only by the striped maple, a smaller tree. Like other maples, its shade tolerance is manifested in its ability to germinate and persist under a closed canopy as an understory plant, and respond with rapid growth to the increased light formed by a gap in the canopy. The sugar maple can grow comfortably in any type of soil except sand.

Sugar maples engage in hydraulic lift, drawing water from lower soil layers and exuding that water into upper, drier soil layers. This not only benefits the tree itself, but also many other plants growing around it.

Human influences have contributed to the decline of the sugar maple in many regions. Its role as a species of mature forests has led it to be replaced by more opportunistic species in areas where forests are cut over. The sugar maple also exhibits a greater susceptibility to pollution than other species of maple. Acid rain and soil acidification are some of the primary contributing factors to maple decline. Also, the increased use of salt over the last several decades on streets and roads for deicing purposes has decimated the sugar maple's role as a street tree.

In some parts of New England, particularly near urbanized areas, the sugar maple is being displaced by the Norway maple. The Norway maple is also highly shade tolerant, but is considerably more tolerant of urban conditions, resulting in the sugar maple's replacement in those areas. In addition, Norway maple produces much larger crops of seeds, allowing it to out-compete native species.

Cultivation and uses

Maple syrup

Collecting sap from sugar maples

The sugar maple is one of the most important Canadian trees, being, with the black maple, the major source of sap for making maple syrup Other maple species can be used as a sap source for maple syrup, but some have lower sugar contents and/or produce more cloudy syrup than these two. Some other trees (birch, ash, etc.) can yield a useful syrup as well, though with different flavors. In maple syrup production from Acer saccharum, the sap is extracted from the trees using a tap placed into a hole drilled through the phloem, just inside the bark. The collected sap is then boiled. As the sap boils, the water is evaporated off and the syrup left behind. 40 litres of maple sap are required to be boiled to produce only 1 litre of pure syrup. This is the reason for the high cost of pure maple syrup.

Timber

Ultra-thin sugar maple sections from Romeyn Beck Hough's American Woods. From top to bottom, the image displays transverse, radial and tangential sections. The image on the right shows light passing through the specimens.

The sapwood can be white, and smaller logs may have a higher proportion of this desirable wood. Bowling alleys and bowling pins are both commonly manufactured from sugar maple. Trees with wavy woodgrain, which can occur in curly, quilted, and "birdseye maple" forms, are especially valued. Maple is also the wood used for basketball courts, including the floors used by the NBA, and it is a popular wood for baseball bats, along with white ash. It is also widely used in the manufacture of musical instruments, such as the members of the violin family (sides and back), guitars (neck), and drum shells. It is also often used in the manufacture of sporting goods.

Canadian maple, often referred to as "Canadian hardrock maple", is prized for pool cues, especially the shafts. Some production-line cues will use lower-quality maple wood with cosmetic issues, such as "sugar marks", which are most often light brown discolorations caused by sap in the wood. The best shaft wood has a very consistent grain, with no marks or discoloration. Sugar marks usually do not affect how the cue plays, but are not as high quality as those without it. The wood is also used in gunstocks and flooring for its strength.

Urban planting

Sugar maple in a suburban landscape

The sugar maple was a favorite street and park tree during the 19th century because it was easy to propagate and transplant, is fairly fast-growing, and has beautiful fall color.[contradictory] As noted above, however, it proved too delicate to continue in that role after the rise of automobile-induced pollution and was replaced by Platanus occidentalis and other hardier species. The shade and the shallow, fibrous roots may interfere with grass growing under the trees. Deep, well-drained loam is the best rooting medium, although sugar maples can grow well on sandy soil which has a good buildup of humus. Light (or loose) clay soils are also well known to support sugar maple growth. Poorly drained areas are unsuitable, and the species is especially short-lived on flood-prone clay flats. Its salt tolerance is low and it is very sensitive to boron.[citation needed] The species is also subject to defoliation when there are dense populations of larvae of Lepidoptera species like the rosy maple moth (Dryocampa rubicunda).

Cultivars

• 'Apollo' – columnar
• 'Arrowhead' – pyramidal crown
• 'Astis' ('Steeple') – heat-tolerant, good in southeastern USA, oval crown
• 'Bonfire' – fast growing
• 'Caddo' – naturally occurring southern ecotype or subspecies, from Southwestern Oklahoma, great drought and heat tolerance, good choice for the Great Plains region[18]

• Closeup of autumn foliage

  'Columnare' ('Newton Sentry') – very narrow
• 'Fall Fiesta' – tough-leaved, colorful in season, above-average hardiness
• 'Goldspire' – columnar with yellow-orange fall color

• 'Green Mountain' (PNI 0285) – durable foliage resists heat and drought, oval crown, above-average hardiness

• 'Inferno' – possibly the hardiest cultivar, with more red fall color than 'Lord Selkirk' or 'Unity'

• 'Legacy' – tough, vigorous and popular

• 'Lord Selkirk' – very hardy, more upright than other northern cultivars

• 'Monumentale' – columnar
• 'September Flare' - very hardy, early orange-red fall color
• 'Sweet Shadow' – lacy foliage
• 'Temple's Upright' – almost as narrow as 'Columnare'
• 'Unity' – very hardy, from Manitoba, slow steady growth

Use by Native Americans

The Mohegan use the inner bark as a cough remedy, and the sap as a sweetening agent and to make maple syrup.[19]

Big Tree
One current national champion of sugar maple is located in Charlemont, Massachusetts. In 2007, it had a circumference of 19.42 ft (5.92 m), or an average diameter at breast height of about 6.18 ft (1.88 m). The maple tree had been 112 ft (34.1 m) tall with a crown spread of 91 ft (27.7 m), counting for a total number of 368 points at the National Register of Big Trees.[20] Another national co-champion in Lyme, Connecticut, measured in 2012, had a circumference of 18.25 feet (5.56 m), or an average diameter at breast height of about 5.8 feet (1.77 m). This tree had been 123 ft (37.5 m) tall with a crown spread of 86 ft (26.2 m), counting for a total number of 364 points.[21]

Leafless sugar maples in Vermont state quarter

The sugar maple is the state tree of the US states of New York, Vermont, West Virginia, and Wisconsin.

It is depicted on the statequarter of Vermont, issued in 2001.