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Prunus americana

Common name:	American Plum	Family:	Rosaceae
Author:	Marshall.	Botanical references:	11, 43, 200
Synonyms:
Known Hazards:	Although no specific mention has been seen for this species, it belongs to a genus where most, if not all members of the genus produce hydrogen cyanide, a poison that gives almonds their characteristic flavour. This toxin is found mainly in the leaves and seed and is readily detected by its bitter taste. It is usually present in too small a quantity to do any harm but any very bitter seed or fruit should not be eaten. In small quantities, hydrogen cyanide has been shown to stimulate respiration and improve digestion, it is also claimed to be of benefit in the treatment of cancer. In excess, however, it can cause respiratory failure and even death.
Range:	N. America - New York to Florida, extending westwards as far as the Rocky Mountains.
Habitat:	Rich soils in mixed deciduous woodland, by streams, on the borders of swamps and in hedgerows[43, 62, 82].
Edibility Rating (1-5):	3	Medicinal Rating (1-5):	2

Other Common Names:	From various places around the Web, may not be correct. See below.
	American Plum [DEN2,FEIS,S,B,P], Plum, American [S], Wild Plum [L],
Epithets:	From a Dictionary of Botanical Epithets
	cana = grayed due to hairs;
Systematics:	From a USDA Plants Database
	Order: Rosales. Rose family

Physical Characteristics

A decidious tree growing to 6m at a medium rate. It is hardy to zone 3. It is in flower in April, and the seeds ripen in August. The flowers are hermaphrodite (have both male and female organs) and are pollinated by Insects. We rate it 3/5 for edibility and 2/5 for medicinal use.

The plant prefers light (sandy), medium (loamy) and heavy (clay) soils and requires well-drained 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, Sunny Edge.

Cultivar 'Wolf': Woodland, Secondary, Sunny Edge, Dappled Shade.

Edible Uses

Fruit; Seed.

Fruit - raw, cooked in pies etc or used in preserves[1, 2, 55, 62, 183]. The flesh is succulent and juicy, though it is rather acid with a tough skin[85, 159]. The best forms are pulpy and pleasant tasting[183, 227]. The fruit is best cooked[159], and it can also be dried for later use[85]. The fruit is about 25mm in diameter and contains one large seed[200].
Seed - raw or cooked[85, 183]. Do not eat the seed if it is too bitter - see the notes above on toxicity.

Medicinal Uses

Disclaimer

Antiasthmatic; Astringent; Disinfectant; Diuretic; Miscellany; Poultice.

A tea made from the scraped inner bark is used as a wash to treat various skin problems and as a mouth wash to treat sores[213]. A poultice of the inner bark is disinfectant and is used as a treatment on cuts and wounds[257].
The bark is astringent, diuretic and pectoral[257]. It has been used to make a cough syrup[257]. An infusion has been used in the treatment of diarrhoea, kidney and bladder complaints[257].
An infusion of the twigs has been used in the treatment of asthma[257].
Although no specific mention has been seen for this species, all members of the genus contain amygdalin and prunasin, substances which break down in water to form hydrocyanic acid (cyanide or prussic acid). In small amounts this exceedingly poisonous compound stimulates respiration, improves digestion and gives a sense of well-being[238].

Other Uses

Broom; Dye; Rootstock; Soil stabilization; Wood.

A green dye can be obtained from the leaves[168].
A dark grey to green dye can be obtained from the fruit[168].
A red dye can be obtained from the roots[257].
This species is widely used as a rootstock for cultivated plums in North America[160].
The tough, elastic twigs can be bound into bundles and used as brooms for sweeping the floor[257].
Trees often grow wild along streams, where their roots tend to prevent soil erosion[226].
Wood - heavy, hard, close-grained, strong[82]. It weighs 45lb per cubic foot[227]. Of no commercial value because the trunk is too small[227].

Cultivation details

Thrives in a well-drained moisture-retentive loamy soil, doing well on limestone[11, 200]. Prefers some lime in the soil but is likely to become chlorotic if too much lime is present[1]. Succeeds in sun or partial shade though it fruits better in a sunny position[11, 200].
Trees are probably hardy to as low as -50°c when fully dormant[160].
A fast-growing but short-lived tree in the wild[229], it is cultivated for its edible fruit in N. America, where there are many named varieties[1, 11, 46]. It flowers well in Britain but rarely fruits well here[11].
Most members of this genus are shallow-rooted and will produce suckers if the roots are damaged[238]. Plants often produce suckers at the roots and form thickets[227].
The branches are brittle[101].
Plants in this genus are notably susceptible to honey fungus[200].

Propagation

Seed - requires 2 - 3 months cold stratification and is best sown in a cold frame as soon as it is ripe[200]. Sow stored seed in a cold frame as early in the year as possible[200]. Protect the seed from mice etc. The seed can be rather slow, sometimes taking 18 months to germinate[113]. Prick out the seedlings into individual pots when they are large enough to handle. Grow them on in a greenhouse or cold frame for their first winter and plant them out in late spring or early summer of the following year.
Cuttings of half-ripe wood with a heel, July/August in a frame. Difficult, if not impossible.
Softwood cuttings from strongly growing plants in spring to early summer in a frame. Difficult, it not impossible.
Suckers in late winter.

Cultivars

'Wolf': A medium to large oval fruit, the skin is thick and tough, the flesh yellow of fair to good quality and completely freestone[183]. The flavour is somewhat too acid for most people to use as a dessert fruit[183]. A productive tree that bears annualy it is adapted to a wide range of climatic conditions[183].
'South Dakota': A medium-size oval fruit, the skin is yellow blushed with red, the flesh yellow, tender, meaty, very sweet and of very good quality[183]. Freestone, it ripens in September and is good for eating fresh or processing[183]. A productive, very hardy but self-sterile tree, it is an excellent pollinator for American-Japanese hybrid plums[183]. It is also an excellent parent for breeding hardy, freestone plums[183].
'Monitor': The medium to large, roundish ovate fruit has a thick skin that is dull bronze-red in colour with very conspicuous russet dots and a light bloom[183]. The flesh is yellow, tender, very juicy, firm, sweet and of good quality[183]. Clingstone, it also tends to crack in wet weather, and ripens in mid-season[183]. A vigorous, upright, spreading, very hardy, productive tree, it is probably of hybrid origin[183].

Suppliers

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

PFAF Web Pages

This plant is mentioned in the following web pages

Web References

Latin and Worldwide Common Names From Multilingual Multiscript Plant Name Database by M. H. Porcher et. al. 1995 - 2000 Landcare Systems Research Laboratory, Department of Crop Production,Institute of Land and Food Resources, The University of Melbourne, Australia.
[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.
[S] Illustration from the Southwest School of Botanical Medicine
[G] Data (Common Names, Uses, Distribution) from the USDA/ARS NPGS's GRIN taxonomic database.
[P] Data. (uses, distribution, wetland) from the USDA'a Plants database.
[HP] Links, Photos, Suppliers from Hortiplex Plant 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.

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.

[43] Fernald. M. L. Gray's Manual of Botany. American Book Co. 1950
A bit dated but good and concise flora of the eastern part of N. America.

[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.

[55] Harris. B. C. Eat the Weeds. Pivot Health 1973
Interesting reading.

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

[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.

[85] Harrington. H. D. Edible Native Plants of the Rocky Mountains. University of New Mexico Press 1967 ISBN 0-8623-0343-9
A superb book. Very readable, it gives the results of the authors experiments with native edible plants.

[101] Turner. N. J. and Szczawinski. A. Edible Wild Fruits and Nuts of Canada. National Museum of Natural Sciences 1978
A very readable guide to some wild foods of Canada.

[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.

[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.

[168] Grae. I. Nature's Colors - Dyes from Plants. MacMillan Publishing Co. New York. 1974 ISBN 0-02-544950-8
A very good and readable book on dyeing.

[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.

[213] Weiner. M. A. Earth Medicine, Earth Food. Ballantine Books 1980 ISBN 0-449-90589-6
A nice book to read though it is difficult to look up individual plants since the book is divided into separate sections dealing with the different medicinal uses plus a section on edible plants. Common names are used instead of botanical.

[226] Lauriault. J. Identification Guide to the Trees of Canada Fitzhenry and Whiteside, Ontario. 1989 ISBN 0889025649
Very good on identification for non-experts, the book also has a lot of information on plant uses.

[227] Vines. R.A. Trees of North Texas University of Texas Press. 1982 ISBN 0292780206
A readable guide to the area, it contains descriptions of the plants and their habitats with quite a bit of information on plant uses.

[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.

[238] Bown. D. Encyclopaedia of Herbs and their Uses. Dorling Kindersley, London. 1995 ISBN 0-7513-020-31
A very well presented and informative book on herbs from around the globe. Plenty in it for both the casual reader and the serious student. Just one main quibble is the silly way of having two separate entries for each plant.

[257] Moerman. D. Native American Ethnobotany Timber Press. Oregon. 1998 ISBN 0-88192-453-9
Very comprehensive but terse guide to the native uses of plants. Excellent bibliography, fully referenced to each plant, giving a pathway to further information. Not for the casual reader.

Readers Comments

Plant Passporting

Rich (michael@thewitchshaven.com) Wed Sep 26 16:58:15 2001

This information has been taken from DEFRA Guide to Plant Passporting. Which places restrictions on plants which can be traded in the UK and the EU mainly because they are carriers for pests and diseases.

Beta vulgaris (Beet), Chaenomeles (Ornamental quince, Japonica), Citrus (Orange, lemon, lime, grapefruit, etc.), Cotoneaster (Cotoneaster), Crataegus (Hawthorn), Cydonia (Quince), Eriobotrya (Includes loquat), Fortunella and hybrids (Kumquat), Humulus lupulus (Hop (including ornamentals)), Malus (Apple (including ornamentals)), Mespilus (Medlar), Poncirus and hybrids (Ornamental citrus), Prunus (other than Prunus laurocerasus and Prunus lusitanica) (Includes almond, apricot, cherry, damson, greengage, nectarine, peach, plum, sloe and ornamental/flowering varieties), Pyracantha (Firethorn), Pyrus (Pear (including ornamentals)), Solanum (stolon or tuber forming types) (Potato), Sorbus (other than Sorbus intermedia) (Includes rowan and whitebeam), Stranvaesia (Stranvaesia), Vitis (Grape, includes grape vine and ornamental grape).

Many other plants require pasporting for commercial growers, these include Abies, Allium ascalonicum, Allium cepa, Allium porrum, Allium schoenoprasum, Apium graveolens, Plants of the family Araceae, Argyranthemum, Aster, Brassica, Castanea, Capsicum annuum, Cucumis, Dendranthema, Dianthus and hybrids, Euphorbia, Exacum, Fragaria, Gerbera, Gypsophila, Helianthus annuus, Impatiens (all varieties of New Guinea hybrids), Lactuca, Larix, Leucanthemum, Lupinus, Lycopersicon lycopersicum, Plants of the family Marantaceae, Medicago sativa, Plants of the family Musaceae, Nicotiana, Pelargonium, Persea, Phaseolus, Picea, Pinus, Platanus, Populus, Prunus laurocerasus and Prunus lusitanica, Pseudotsuga, Quercus, Rubus, Plants of the family Solanaceae (other than plants of stolon or tuber forming species of Solanum and their hybrids), Solanum melongena, Spinacia, Plants of the family Strelitziaceae, Tanacetum, Tsuga, Verbena.

Cross references: Plants: Beta vulgaris, Humulus lupulus. Genera: Chaenomeles, Citrus, Cotoneaster, Crataegus, Cydonia, Eriobotrya, Fortunella, Malus, Mespilus, Poncirus, Prunus, Pyracantha, Pyrus, Solanum, Sorbus, Stranvaesia, Vitis.

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Bibliography

Plant information taken from the Plants For A Future - Species Database. Copyright (c) 1997-2003.
WEB search engine by Rich Morris - Home Page- Contact Info
Blagdon Cross, Ashwater, Beaworthy, Devon, EX21 5DF, UK.
Website: www.pfaf.org Phone: 0845 458 4719/_44(0) 1208 872963

This page (UK) http://www.comp.leeds.ac.uk/cgi-bin/pfaf/arr_html?Prunus+americana
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