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Acer saccharum grandidentatum

Common name:	Big-Tooth Maple	Family:	Aceraceae
Author:	(Torr.& A.Gray.)Desmarais.	Botanical references:	11, 82, 200
Synonyms:	Acer grandidentatum (Nutt.)
Known Hazards:	None known
Range:	Western N. America - Rocky Mountains.
Habitat:	Found in moist sites such as wet canyons, valleys and the banks of mountain streams at elevations of 1200 - 2100 metres[229].
Edibility Rating (1-5):	4	Medicinal Rating (1-5):	0

Other Possible Synonyms:	From various places across the web, may not be correct. See below.
	A. grandidentatum var. grandidentatum[B,P] A. saccharum ssp. grandidentatum[B,P] A. saccharum subsp. grandidentatum[G] A. saccharum var. grandidentatum[B,P] Saccharodendron grandidentatum[B,P]
Other Common Names:	From various places around the Web, may not be correct. See below.
	Bigtooth Maple [P,DEN1,FEIS,L], Canyon Maple [B],
Epithets:	From a Dictionary of Botanical Epithets
	acer = sharp, pungent dentatum = with teeth grandidentatum = large teeth saccharum = sugar
Systematics:	From a USDA Plants Database
	Order: Sapindales. Maple family

Physical Characteristics

A decidious tree growing to 12m by 8m . It is hardy to zone 3. It is in flower from April to May, and the seeds ripen in September. We rate it 4/5 for edibility and 0/5 for medicinal use.

The plant prefers light (sandy), medium (loamy) and heavy (clay) soils, requires well-drained soil and can grow in heavy clay soil. The plant prefers acid, neutral and basic (alkaline) soils. It can grow in semi-shade (light woodland) or no shade. It requires moist soil.

Habitats and Possible Locations

Woodland, Canopy.

Edible Uses

Inner bark Sap Seed Sweetener.

The sap is relatively rich in sugar and can be made into a drink or concentrated into a syrup by boiling off the water[1, 2, 11, 34, 57]. The syrup is used as a sweetener on many foods. It can be harvested in late winter or early spring[[142], the flow is best on a warm sunny day after a frost. Trees on southern slopes in sandy soils give the best yields. It is best to make a hole about 7cm deep and about 1.3 metres above the ground[171]. Yields of 40 - 100 litres per tree can be obtained[142]. The best sap production comes from cold-winter areas with continental climates.
Seed - boiled then roasted[62, 105, 159]. The seed is about 6mm long and is produced in small clusters[82].
Inner bark cooked. It is dried, ground into a powder and then used as a thickening in soups etc or mixed with cereals when making bread[105, 161].

Medicinal Uses

Disclaimer

None known

Other Uses

Fuel Preservative Wood.

The leaves are packed around apples, rootcrops etc to help preserve them[18, 20].
Wood - close grained, tough, hard, heavy. Used for furniture, ship building, etc[46, 61, 82, 171]. It is a good fuel.

Cultivation details

Of easy cultivation, it prefers a good moist well-drained soil but succeeds on most soils[11, 98]. Chlorosis can often develop as a result of iron deficiency when the plants are grown in alkaline soils. Grows well in heavy clay soils. Trees need full light and a lot of space if they are to grow well[98].
Plants are hardy to about -45° c when fully dormant[160].
This species is not a great success in Britain[1], though it does better than once thought[11]. It grows well in &ndndndnd[59]. Slow growing when young[11]. Plants produce prodigious root growth but very little top growth in first year from seed[133].
A very ornamental tree[1] but a bad companion plant, inhibiting the growth of nearby plants[18, 20].
This species is commercially exploited in America for its sap[1, 11]. Along with A. saccharum and the sub-species A. s. nigrum it is the major source of maple syrup[11]. There are some named varieties[183]. The sap can be tapped within 10 - 15 years from seed but it does not flow so well in areas with mild winters[160].

Propagation

Seed - best sown as soon as it is ripe in a cold frame, it usually germinates in the following spring. A lot of the seed is non-viable, it is best to cut a few open to see if there is an embryo[113]. An average of 95% germination can be achieved from viable seed[98]. Pre-soak stored seed for 24 hours and then stratify for 2 - 4 months at 1 - 8° c. It can be slow to germinate, sometimes taking two years[125]. The seed can be harvested 'green' (when it has fully developed but before it has dried and produced any germination inhibitors) and sown immediately. It should germinate in late winter. If the seed is harvested too soon it will produce very weak plants or no plants at all[80, 113]. When large enough to handle, prick the seedlings out into individual pots and grow them on until they are 20cm or more tall before planting them out in their permanent positions.
Layering, which takes about 12 months, is successful with most species in this genus.
Cuttings of young shoots in June or July. The cuttings should have 2 - 3 pairs of leaves, plus one pair of buds at the base. Remove a very thin slice of bark at the base of the cutting, rooting is improved if a rooting hormone is used. The rooted cuttings must show new growth during the summer before being potted up otherwise they are unlikely to survive the winter.

Suppliers

For more details of plant suppliers please see our Suppliers Page which lists many more places to look.

Web References

[HP] Links, Photos, Suppliers from Hortiplex Plant Database

References for Acer grandidentatum (a possible synonym).

[V] Images from the Vascular Plant Image Gallery of the Texas A& M Bioinformatics Working Group.
[B] Data (Latin & Common names, other references) from the BONAP's Synonymized Checklist of the Vascular Flora of the United States, Puerto Rico, and the Virgin Islands.
[P] Data. (uses, distribution, wetland) from the USDA'a Plants database.
[DEN] Data _ Photos (Good Identification info) from the Virginia Tech's Dendrology Deptarments' Tree Fact Sheets.
[FEIS] Data (Uses, Ecology, Fire Effects) from the USDA Forestry Service Fire Effects Information System.
[FEIS] Data (Uses, Ecology, Fire Effects) from the USDA Forestry Service Fire Effects Information System.

References for Acer grandidentatum var. grandidentatum (a possible synonym).

[B] Data (Latin & Common names, other references) from the BONAP's Synonymized Checklist of the Vascular Flora of the United States, Puerto Rico, and the Virgin Islands.
[P] Data. (uses, distribution, wetland) from the USDA'a Plants database.

References for Acer saccharum subsp. grandidentatum (a possible synonym).

[G] Data (Common Names, Uses, Distribution) from the USDA/ARS NPGS's GRIN taxonomic database.

References for the family Aceraceae.

[CHINA] Draft Data Very detailed botanical/identification info. from the Flora of China.

See the PFAF Links Pages for other sources.

Also try Photos and info from the The Plants Database which has 14,000 images.

References

[1] F. Chittendon. RHS Dictionary of Plants plus Supplement. 1956 Oxford University Press 1951
Comprehensive listing of species and how to grow them. Somewhat outdated, it has been replaces in 1992 by a new dictionary (see [200]).

[2] Hedrick. U. P. Sturtevant's Edible Plants of the World. Dover Publications 1972 ISBN 0-486-20459-6
Lots of entries, quite a lot of information in most entries and references.

[11] Bean. W. Trees and Shrubs Hardy in Great Britain. Vol 1 - 4 and Supplement. Murray 1981
A classic with a wealth of information on the plants, but poor on pictures.

[18] Philbrick H. and Gregg R. B. Companion Plants. Watkins 1979
Details of beneficial and antagonistic relationships between neighbouring plants.

[20] Riotte. L. Companion Planting for Successful Gardening. Garden Way, Vermont, USA. 1978 ISBN 0-88266-064-0
Fairly good.

[34] Harrison. S. Wallis. M. Masefield. G. The Oxford Book of Food Plants. Oxford University Press 1975
Good drawings of some of the more common food plants from around the world. Not much information though.

[46] Uphof. J. C. Th. Dictionary of Economic Plants. Weinheim 1959
An excellent and very comprehensive guide but it only gives very short descriptions of the uses without any details of how to utilize the plants. Not for the casual reader.

[57] Schery. R. W. Plants for Man.
Fairly readable but not very comprehensive. Deals with plants from around the world.

[59] Thurston. Trees and Shrubs in &ndndndnd.
Trees and shrubs that succeed in &ndndndnd based on the authors own observations. Good but rather dated.

[61] Usher. G. A Dictionary of Plants Used by Man. Constable 1974 ISBN 0094579202
Forget the sexist title, this is one of the best books on the subject. Lists a very extensive range of useful plants from around the world with very brief details of the uses. Not for the casual reader.

[62] Elias. T. and Dykeman. P. A Field Guide to N. American Edible Wild Plants. Van Nostrand Reinhold 1982 ISBN 0442222009
Very readable.

[80] McMillan-Browse. P. Hardy Woody Plants from Seed. Grower Books 1985 ISBN 0-901361-21-6
Does not deal with many species but it is very comprehensive on those that it does cover. Not for casual reading.

[82] Sargent. C. S. Manual of the Trees of N. America. Dover Publications Inc. New York. 1965 ISBN 0-486-20278-X
Two volumes, a comprehensive listing of N. American trees though a bit out of date now. Good details on habitats, some details on plant uses. Not really for the casual reader.

[98] Gordon. A. G. and Rowe. D. C. f. Seed Manual for Ornamental Trees and Shrubs.
Very comprehensive guide to growing trees and shrubs from seed. Not for the casual reader.

[105] Tanaka. T. Tanaka's Cyclopaedia of Edible Plants of the World. Keigaku Publishing 1976
The most comprehensive guide to edible plants I've come across. Only the briefest entry for each species, though, and some of the entries are more than a little dubious. Not for the casual reader.

[113] Dirr. M. A. and Heuser. M. W. The Reference Manual of Woody Plant Propagation. Athens Ga. Varsity Press 1987 ISBN 0942375009
A very detailed book on propagating trees. Not for the casual reader.

[125] ? The Plantsman. Vol. 5. 1983 - 1984. Royal Horticultural Society 1983
Excerpts from the periodical giving cultivation details and other notes on some of the useful plants..

[133] Rice. G. (Editor) Growing from Seed. Volume 1. Thompson and Morgan. 1987
Very readable magazine with lots of information on propagation.

[142] Brouk. B. Plants Consumed by Man. Academic Press 1975 ISBN 0-12-136450-x
Readable but not very comprehensive.

[159] McPherson. A. and S. Wild Food Plants of Indiana. Indiana University Press 1977 ISBN 0-253-28925-4
A nice pocket guide to this region of America.

[160] Natural Food Institute, Wonder Crops. 1987.
Fascinating reading, this is an annual publication. Some reports do seem somewhat exaggerated though.

[161] Yanovsky. E. Food Plants of the N. American Indians. Publication no. 237. U.S. Depf of Agriculture.
A comprehensive but very terse guide. Not for the casual reader.

[171] Hill. A. F. Economic Botany. The Maple Press 1952
Not very comprehensive, but it is quite readable and goes into some a bit of detail about the plants it does cover.

[183] Facciola. S. Cornucopia - A Source Book of Edible Plants. Kampong Publications 1990 ISBN 0-9628087-0-9
Excellent. Contains a very wide range of conventional and unconventional food plants (including tropical) and where they can be obtained (mainly N. American nurseries but also research institutes and a lot of other nurseries from around the world.

[200] Huxley. A. The New RHS Dictionary of Gardening. 1992. MacMillan Press 1992 ISBN 0-333-47494-5
Excellent and very comprehensive, though it contains a number of silly mistakes. Readable yet also very detailed.

[229] Elias. T. The Complete Trees of N. America. Field Guide and Natural History. Van Nostrand Reinhold Co. 1980 ISBN 0442238622
A very good concise guide. Gives habitats, good descriptions, maps showing distribution and a few of the uses. It also includes the many shrubs that occasionally reach tree proportions.

Readers Comments

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