WALLACE W HANSEN

Native Plants of the Northwest

Native Plant Nursery & Gardens

 

2158 Bower Ct S.E., Salem, Oregon 97317-9216

E-Mail: Wallace W Hansen
Phone: 503-581-2638; Fax: 408-586-1306

Click here for Home Page: www.nwplants.com

For information about Wallace W Hansen Northwest Native Plant Nursery & Gardens: Business Information (Ordering, etc.)

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Updated August 18, 2007

Big Leaf Maple, Oregon Maple, Broadleaf Maple (Acer macrophyllum)

Family: Aceraceae


A Note from Wally: I grow Acer macrophyllum (Big Leaf Maple, Oregon Maple, Broadleaf Maple) and many other Northwest Native Plants here in my Nursery and Gardens in the Willamette Valley in Western Oregon. I specialize in Northwest Native Plants and sell both Wholesale and Retail, depending on quantity. I usually have plants available year-round in one gallon containers and often in various other container sizes and as Bare Root plants in the Winter months. This site is intended as a reference for all who are interested in Northwest Native Plants: amateur, professional – everyone. For more information, go to my Home Page at www.nwplants.com and then click on Plant Catalog for current prices and availability. Be sure and then click on Plant Sales for any bargains. If you buy in large quantities, check the Wholesale Information Sites on my Home Page.

If you have any information about this species – stories, climates, uses, propagation, etc. please contact me at plants@nwplants.com. If I publish your tips and information, I will credit you on the web and send you a credit memo.

The “big daddy” of the Pacific Northwest maples, big leaf maples tower above their native relatives generally reaching a height between 40 and 80 feet. The burgeoning canopy may extend out to 50 feet and its massive leaves are larger than any other maple. With a name that translates into “large leaf” (macro=large, phylum=leaf), you cannot mistake the tree’s distinctive five-fingered leaves that broaden to over a foot in both length and width. As the second most abundant tree in the Pacific Northwest, the species proves its versatility and hardiness. If you have enough space and are interested in introducing this native into your own landscape, this grand shade tree is available for purchase. See my Bare Root Sales Site for current pricing.
Habit: The distinctive big leaf maple skeleton arises from a trunk that diverges into numerous long, thick vertical limbs. Within its dramatic canopy, the spreading and sometimes drooping branches create the perfect challenge for those who love to climb into treetops. Not to mention, the tree branches are hosts to a perfect “canopy community” of epiphytic plants, such as mosses and licorice ferns, which tend to form thick mats covering the entire tree in a carpet of green. The trunk averages a diameter of 2 to 4 feet, but the immense mature trees may reach an astounding height of 100 feet and have a trunk stretching 5 feet across.

If you don’t have the leaves to aid identification, the big leaf maple can be distinguished from other tree silhouettes in winter by looking for the tree with grayish-brown to reddish-brown bark and a distinctive pattern of interlacing grooves and 4-sided raised ridges. Then follow one of its stout green twigs to the end and make sure it tapers to a sizeable ¼-inch terminal bud accompanied by 2 smaller buds on each side. The broad-crowned maple bears leaves averaging 1 foot across that are divided into 5 deep lobes or points. Leaf margins are blunted with irregular, coarse teeth. Distinctive deep green leaves have shiny upper sides but become paler beneath. The foliage turns pale yellow in the fall, and may sometimes exhibit a more dramatic show of warm orange and yellow tones. Big leaf maple is the only North American maple species to exude a milky sap from its long leaf stalks. These long leaf petioles can attain a length equivalent to that of the leaf.

Big leaf maple’s greenish-yellow flowers usually appear before the leaves. In spring the tree gives rise to fragrant bouquets of flowers that dangle together in leggy loose clusters. Each sweet-scented flower (there can be 10 to 50 flowers in each clustered inflorescence) measures about ¼-inch across. By autumn the golden brown double samara develops, with wings measuring 1 to 2 inches long. Wonderfully fuzzy golden hairs cover its many samaras. As a prolific seed producer, the long-lived maple may produce up to one million seeds a year. Imagine the numbers of forest fauna that are sustained by its seeds over the some 250 years of its life.

Habitat and Range: Like most native maples, you’ll find the big leaf dominating the landscape of many the riparian communities near streams and in river floodplains. The gregarious species can be found growing together in exclusive groups or scattered amid evergreen woods. The maple is common in foothills and valleys within southern British Columbia all the way through the Cascades down to the southern Sierra Nevada mountain range. This versatile tree prefers the moist well-drained soils of riparian habitats but withstands both seasonal flooding and dry upland environments. The tolerant nature of this maple means the tree can reside in deep loamy soils as well as poorer rocky soils.

The maple may establish in the full sun but also takes advantage of partially shaded sites. The quickly decomposing leaves are very high in nutrients and generate thick, rich soils beneath its canopy. If you lift up a mass of maple leaf litter, you can be pleasantly surprised by finding a rare Megomphix snail or jumping slug! Many mollusk species prefer the maple’s protective layers of thick litter and nutritious humus. The calcium-rich bark supports a veritable blanket of epiphytic plants that easily make a home within the interlaced furrows. In the moist canyons of mountain streams, mosses, lichens, liverworts and licorice fern (Polypodium glycyrrhiza (vulgare) anchor into every niche and begin a mutually beneficial relationship with their host tree. While the maple provides the epiphytes with nutrients and habitat, the tree produces a network of aerial roots in its crown to tap into the abounding mats of nutrients and moisture created by the epiphytes.

Ornamental Values: Be sure you have enough space for this dramatically spreading tree. It has a reputation for dropping large limbs so be aware of plantings near buildings. Big leaf maple roots also have a tendency to attack and invade water or sewer lines. The long-lived shade tree grows rapidly when young but slows down as it matures. For best success, plant the seedlings in an open, sunny or partially shaded area. Big leaf maples thrive in well-drained soils, but do excellently in almost any soil type. The tree is hardy from zones 4 to 7.

Native Plant Gardening/Wildlife Habitat: The big leaf maple is a favorite of creatures great and small. The numerous seeds that often remain on the tree into winter are eaten by songbirds such as evening grosbeaks, and small mammals. The early blooming spring flowers are a great nectar source for bees and other insects. Birds love to perch and nest within the broad network of branches. Its long–lasting downed woody debris creates important habitat for cavity nesting birds. The decaying wood attracts a host of insects that in turn feed a multitude of insectivorous birds. The woody debris decomposes slowly in streams and rivers, creating perfect fish habitat. Tender twigs, shoots and leaves are consumed by black-tailed and mule deer as well as elk. For a successful garden, plant the trees along with its native companions sword fern (Polystichum munitum), Oregon grape (Mahonia [Berberis] nervosa), and salal (Gautheria shalon). Its natural communities also include Douglas fir (Psuedotsuga menziesii), western hemlock (Tsuga heterophylla), vine maple (Acer circinatum), and willows (Salix species).

Restoration and Mitigation Values: This majestic maple is great for revegetation of stream banks and steep slopes. Like its relatives, the massive root system of the big leaf maple exhibits excellent soil binding properties. With its tendency to produce copious amounts of seed, planting just a few maples will ensure that many new generations of maples will carry on.

NOTE: See commercial availability on our Wholesale websites for Bareroot and Containerized plants.

Historical and Cultural Uses: Big leaf maple is the only western maple considered to have any real commercial significance. The large dense burls that form at the base of the tree are esteemed for their attractive knotted grain patterns. The finely grained wood is fairly solid and can be fashioned into fine furniture, interior finishing, musical instruments, and cabinets as well as innumerable craft projects.

Traditionally, Native Americans and aboriginal groups gathered the wood for burning or carving into canoe oars; it was called the “paddle tree” by many tribes. The wonderfully large leaves made good temporary containers and could be used to cover food cooking in the fire pits. It was said that if you rubbed the leaves on a prepubescent male it would prevent the boy from growing thick whiskers. The fibrous inner bark of the maple was also gathered and worked into ropes and baskets.

Edible and Medicinal Uses:* Of all the native Northwest maples, the big leaf has the sweetest sap. However, the sugar content is still quite less than the famous sugar maple and you’ll need to gather a lot more sap to produce the same amount of sweet syrup. The maple’s fragrant flowers are sweet tasting and make beautiful garnishes for salads and cakes. The raw shoots can be eaten fresh or dried and then boiled, but it is usually only consumed in extreme situations.

Traditional decoctions of big leaf maple leaves were prepared by Native Americans to treat sore throats. The bark has also been described as a remedy for tuberculosis, which can be boiled to make a tea.

* Please use caution when preparing or eating any parts of a plant. Identification of the species and knowledge of a plant’s toxicity are both essential before using any plant species medicinally or otherwise. Please consult with a heath professional before attempting to treat any ailment.

Propagation Techniques:

Seeds -- Big leaf species are early and heavy seed producers, seeds may be produced by age 10 or earlier if in an open setting. Collect the fuzzy golden seeds in fall, gather them as late in the season as possible but before the rains begin. They are quite easy to propagate. You can sow the seeds directly into a cold frame, but you should do so as soon as possible. Many seeds don’t survive storage. For short storage place the seeds in airtight containers and store at close to freezing temperatures. Cold stratify the seeds for 1 to 3 months before sowing. Try to aim for seed sowing in February or March. Allow the seedlings to remain in their mulched beds for at least two years before attempting to transplant.

Vegetative -- The numerous seedlings produced around a parent plant can be salvaged, but only remove ones under 3 feet in height.

For more information on native plant gardening or to receive notices of special sales or other events and  seasonal gardening tips, please visit my home page. Any current plant sales are displayed on the home page too! My on-line catalog gives further details about the retail and wholesale availability of the native species I have for sale. If you’re in the Salem, Oregon area, stop by and visit my nursery and its wonderful native garden displays.

Thanks, and happy gardening!

Wally


Bibliography:

Thank you to the following references for their invaluable information:

Plants of the Pacific Northwest Coast by Pojar and Mackinnon (1994)

Western Forests, A National Audubon Society Nature Guide by Stephen Whitney (1985)

Flora of the Pacific Northwest by C.L. Hitchcock & A. Cronquist, University of Washington Press (1973)

Trees, Shrubs, & Flowers to know in British Columbia & Washington by C.P. Lyons, Lone Pine Publishing (1995)

Collecting, Processing and Germinating Seeds of Wildland Plants by J.A. Young and C.G. Young, Timberland Press (1986)

Trees to know in Oregon by Oregon State University Extension Service & Oregon Department of Forestry, Extension Circular 1450 (1995)

The Reference Manual of Woody Plant Propagation from seed to tissue culture by M.A. Dirr and C.W. Heuser, Jr., Varsity Press, Inc. (1987)

Landscaping for Wildlife in the Pacific Northwest by Russell Link, University of Washington Press & Washington Department of Fish & Wildlife (1999)

Naturescaping, A Landscaping Partnership with Nature by Oregon Department of Fish & Wildlife (2001)

US Department of Agriculture, Forest Service, Rocky Mountain Research Station, Fire Sciences Laboratory (2002, February) http://www.fs.fed.us/database/feis/

BCAdventure.com http://www.bcadventure.com/adventure/wilderness/forest/

Backcountry Rangers, Edible Sierra Nevada Plants Guide http://www.backcountryrangers.com/

British Columbia Ministry of Forests http://www.for.gov.bc.ca/pab/publictns/treebook/bigleafmaple.html

Green Screens November 1998 newsletter http://www.olywa.net/speech/November98/Guttman.html


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