Gaultheria shallon (salal)
- Summary of Invasiveness
- Taxonomic Tree
- Notes on Taxonomy and Nomenclature
- Plant Type
- Distribution Table
- History of Introduction and Spread
- Risk of Introduction
- Habitat List
- Hosts/Species Affected
- Biology and Ecology
- Latitude/Altitude Ranges
- Air Temperature
- Rainfall Regime
- Soil Tolerances
- Natural enemies
- Notes on Natural Enemies
- Means of Movement and Dispersal
- Pathway Causes
- Pathway Vectors
- Environmental Impact
- Risk and Impact Factors
- Uses List
- Detection and Inspection
- Prevention and Control
- Gaps in Knowledge/Research Needs
- Distribution Maps
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PicturesTop of page
IdentityTop of page
Preferred Scientific Name
- Gaultheria shallon Pursh
Preferred Common Name
Other Scientific Names
- Brossaea shallon (Pursh) Kuntze
- Shallonium serrulatum Raf.
International Common Names
- English: shallon
Local Common Names
- Germany: shallon-rebhuhnbeere; shallon-scheinbeere
- GAHSH (Gaultheria shallon)
Summary of InvasivenessTop of page
G. shallon is an ericaceous shrub typically found as part of the understory of coniferous forests in the west coast of North American, from California to Alaska. It can form dense to almost impenetrable thickets that dominate the site, reducing forest regeneration and shadowing native plant species. In its native range it has moderate to low invasiveness. Outside of this range it has been reported as a particular problem in the UK, where it can form dense thickets in acid soils which prevent other more valuable pasture species from establishing. Minor introductions have also been reported in France, Germany, Ireland and New Zealand.
Taxonomic TreeTop of page
- Domain: Eukaryota
- Kingdom: Plantae
- Phylum: Spermatophyta
- Subphylum: Angiospermae
- Class: Dicotyledonae
- Order: Ericales
- Family: Ericaceae
- Genus: Gaultheria
- Species: Gaultheria shallon
Notes on Taxonomy and NomenclatureTop of page
The genus Gaultheria was first created by the German American botanist Pehr Kalm in his “Guide of Canada”, in homage to the French Canadian botanist Jean Françoise Gaultier.
The names shallon and salal are of Amerindian origin, probably from the Chinook language sallal, recorded during Lewis and Clack expedition as shelwel, shellwell (Oxford Dictionary, 2014).
DescriptionTop of page
G. shallon is a perennial, evergreen shrub with a growth form from sprawling to erect. G. shallon can reach 0.2-5 m tall, growing strongly from rhizomes. Leaves are evergreen, alternate, round to ovate, pointed, glossy green, with a leathery texture. The lower side of the leaf is rough and lighter green. Each leaf has a base rounded or cordate, margins finely serrulate (with the “teeth” fimbriate apically), apex mucronate/apiculate or aristate, surfaces glabrous, reaching 5-10 cm long (Flora of North America Editorial Committee, 2015). Young shoots are red. Mature bark and twigs of G. shallon are grayish-brown and smooth. The twigs change angles between each node, giving it a zigzag appearance. The flowers are hermaphroditic (have both male and female organs) and are pollinated by insects. The inflorescence consists of a bracteate raceme, one-sided, with 5 to 15 flowers at the ends of branches. Flowers are white to pale pink, urn-shaped and they appear in late spring and early summer. Each flower is composed of a deeply five-parted, glandular-haired calyx and an urn-shaped pink to white, glandular to hairy, five-lobed corolla, 7-10 mm long. Flowers mature to fleshy, reddish to blue, rough-surfaced, hairy, nearly spherical fruit 6-10 mm in diameter (Pojar and MacKinnon, 2004).
Plant TypeTop of page
DistributionTop of page
The centre of origin of G. shallon comprises the west coast of North America; Alaska, British Columbia, Washington, Oregon and California.
A record for G. shallon in Nei Menggu, China has been reported (CPNWH, 2015) but it is likely that this record is invalid.
Distribution TableTop of page
The distribution in this summary table is based on all the information available. When several references are cited, they may give conflicting information on the status. Further details may be available for individual references in the Distribution Table Details section which can be selected by going to Generate Report.Last updated: 17 Dec 2021
|Continent/Country/Region||Distribution||Last Reported||Origin||First Reported||Invasive||Reference||Notes|
|China||Present||Recorded in Nei Menggu. Record likely to be invalid; Original citation: Consortium of Pacific Northwest Herbaria (CNPWH) (2015)|
|Ireland||Present||Introduced||1961||Invasive||Introduced in 1961 for food and to provide cover|
|Spain||Present||Introduced||Present in a botanical garden; Original citation: Discover Life (2015)|
|United Kingdom||Present, Widespread||Introduced||1828||Invasive|
|Canada||Present||Present based on regional distribution.|
|-British Columbia||Present||Native||Original citation: Consortium of Pacific Northwest Herbaria (CNPWH) (2015)|
|United States||Present||Present based on regional distribution.|
|-Alaska||Present||Native||Original citation: Consortium of Pacific Northwest Herbaria (CNPWH) (2015)|
|-California||Present||Native||Original citation: Consortium of Pacific Northwest Herbaria (CNPWH) (2015)|
|-Oregon||Present||Native||Original citation: Consortium of Pacific Northwest Herbaria (CNPWH) (2015)|
|-Texas||Present||Introduced||Original citation: Discover Life (2015)|
|-Washington||Present||Native||Original citation: Consortium of Pacific Northwest Herbaria (CNPWH) (2015)|
|Australia||Present||Present based on regional distribution.|
History of Introduction and SpreadTop of page
G. shallon was introduced to Britain from North America in 1828 by David Douglas, who intended the plant to be used as an ornamental (Pojar and Mackinnon, 2004). By 1914 it could be seen growing in the wild. After establishing in heathlands as a mild invasive species, its spread was traditionally controlled by cattle ranchers. Probably as a result of these practices and in view of its potential as forage, G. shallon was introduced into Ireland in 1961 (EPPO, 2014).
Further introductions in Europe are likely to be associated with releases from botanical gardens or collectors. In New Zealand is believed that G. shallon has been naturalized since 1946 (Webb et al., 1988). It was introduced into Tasmania, Australia in 1973 where it has also naturalized (Council of Heads of Australaisan Herbaria, 2014).
IntroductionsTop of page
|Introduced to||Introduced from||Year||Reason||Introduced by||Established in wild through||References||Notes|
|Natural reproduction||Continuous restocking|
|Ireland||UK||1961||Forage (pathway cause)||Yes||EPPO (2014)|
|New Zealand||North America||1946-1954||Yes||Webb et al. (1988)|
|UK||North America||1828||Ornamental purposes (pathway cause)||Yes||Pojar and Mackinnon (2004)|
Risk of IntroductionTop of page
The risk of G. shallon being introduced into new areas is likely related to its availability in the North American market for ornamental purposes. The risk of spread, however, is probably low east of the Rocky Mountains, as the climatic conditions in continental North America are unfavourable for this species. This species is however readily spread by birds eating the berries and translocating them into new areas.
HabitatTop of page
G. shallon forms thickets at forest edges and in recently cut coniferous to mixed stands, becoming less dense as the tree canopy is more developed. G. shallon tolerates open sun and some shading. If heavily shaded, plants become elongated and eventually die. It grows in the understory, dominant in a variety of lowland to montane, coniferous or mixed evergreen forests. It is often a component in Douglas-fir (Pseudotsuga menziesii) forests and western hemlock (Tsuga heterophylla) or western hemlock-western redcedar (Thuja plicata) forests. In full sun, it forms dense thickets whilst in shade, it is more spindly. It is ericaceous and can tolerate drought, but is not tolerant of severe frost. In the UK it thrives on lowland heath, a rare habitat, which provides acidic soil and is warmer than upland heath.
Habitat ListTop of page
|Terrestrial||Managed||Managed forests, plantations and orchards||Principal habitat||Natural|
|Terrestrial||Managed||Disturbed areas||Secondary/tolerated habitat||Natural|
|Terrestrial||Managed||Rail / roadsides||Secondary/tolerated habitat||Natural|
|Terrestrial||Natural / Semi-natural||Natural forests||Principal habitat||Natural|
|Terrestrial||Natural / Semi-natural||Riverbanks||Secondary/tolerated habitat||Natural|
|Terrestrial||Natural / Semi-natural||Wetlands||Secondary/tolerated habitat||Natural|
|Terrestrial||Natural / Semi-natural||Rocky areas / lava flows||Secondary/tolerated habitat||Natural|
|Littoral||Coastal areas||Principal habitat||Natural|
|Littoral||Coastal dunes||Secondary/tolerated habitat||Natural|
Hosts/Species AffectedTop of page
G. shallon affects many pasture species mainly by overshadowing them and forming dense thickets that do not allow other plant species to emerge and grow.
Biology and EcologyTop of page
G. shallon has a chromosome number of 22 (Chinnappa and Chmielewski, 1987).
G. shallon can reproduce both from seed and from vegetative regeneration. However, new seedling establishment is apparently insignificant where plants have already established. In these areas, the expansion of existing clones occurs through layering, sprouting of rhizomes, root suckering and sprouting from the stem base (Haeussler and Coates, 1986).
Physiology and Phenology
G. shallon has a wide native range and through local adaptation it exhibits variable annual and geographic phenological development. Plants generally flower in late spring or early summer, from May to July (Kruckeberger, 1982). Fruit ripening occurs from August through to October and fruits may persist on the stem until December (Whittaker, 1954; Dimock et al., 1974; Haeussler and Coates, 1986).
This species is an evergreen woody shrub that once established expands vigorously from rhizomes. Longevity of individual plants is unknown, but the clones remain on site many decades.
G. shallon can be found on soils derived from a wide range of parent rocks, including diorite, breccia and basalt, serpentine, granite and metamorphic rock (Whittaker, 1954; Whittaker, 1960; Sawyer et al., 1977; Halverson et al., 1986). Elevation ranges from sea level to approximately 1000 m, with the limit lowering in the northern reaches of the distribution limit. Generally, G. shallon grows better on moist sandy or peaty soils, but it can be found on a wide variety of mineral and organic soils, including shallow rocky soils, sand dunes, coarse alluvium, glacial till and peat (Hawk and Zobel, 1974; Haussler and Coates, 1986). G. shallon requires little nutrients and it can grow on poor to moderately rich soils (Klinka et al., 1989; Prescott et al., 2003). This shrub prefers soils with a neutral to slightly acid pH, but it can grow well in acid soils up until pH 4.0. The growth form of G. shallon can change depending on site conditions, with plants assuming a dwarfed or mat-like growth form on shallow, droughty soils. G. shallon commonly grows on decaying wood and stumps. It can also grow as an epiphyte on living trees in extremely humid areas (Hauessler and Coates, 1986).
Preferred habitats for G. shallon are sunny edges, dappled shade or shady edges of woodlands. G. shallon grows in cool, humid to perhumid, mesothermal climates (Klinka et al., 1985, 1989). Winters are typically mild with little snow accumulation (Haussler and Coates, 1986). G. shallon reaches its greatest size and abundance in the foggy maritime temperate forests along the Pacific Coast (van Meter, 1985). Plants can survive to temperatures as low as -15 ºC, but they are sensitive to frost (Haussler and Coates, 1986).
ClimateTop of page
|C - Temperate/Mesothermal climate||Preferred||Average temp. of coldest month > 0°C and < 18°C, mean warmest month > 10°C|
|Cf - Warm temperate climate, wet all year||Preferred||Warm average temp. > 10°C, Cold average temp. > 0°C, wet all year|
|Cs - Warm temperate climate with dry summer||Tolerated||Warm average temp. > 10°C, Cold average temp. > 0°C, dry summers|
|Cw - Warm temperate climate with dry winter||Tolerated||Warm temperate climate with dry winter (Warm average temp. > 10°C, Cold average temp. > 0°C, dry winters)|
|Df - Continental climate, wet all year||Tolerated||Continental climate, wet all year (Warm average temp. > 10°C, coldest month < 0°C, wet all year)|
Latitude/Altitude RangesTop of page
|Latitude North (°N)||Latitude South (°S)||Altitude Lower (m)||Altitude Upper (m)|
Air TemperatureTop of page
|Parameter||Lower limit||Upper limit|
|Absolute minimum temperature (ºC)||-15|
Rainfall RegimeTop of page
Soil TolerancesTop of page
- seasonally waterlogged
Special soil tolerances
Natural enemiesTop of page
Notes on Natural EnemiesTop of page
A number of fungal pathogens have been reported on G. shallon. These include, Phoma exigua [Boeremia exigua] Phyllosticta gaultheriae and Phyllostic pyrolae [Mycosphaerella pyrolae] (Shamou and Zhao, 2005; Zhao and Shamou, 2006).
Means of Movement and DispersalTop of page
G. shallon is naturally dispersed over short distances through the production of rhizomes.
The berries are attractive to birds and are consumed and excreted into new areas facilitating its spread.
G. shallon was introduced into the British Isles as forage and cattle cover in the early nineteenth century and again in mid twentieth century. It was also planted for game cover in woods and on heaths. It was also introduced into botanical gardens for ornamental purposes where it has since escaped.
Pathway CausesTop of page
Pathway VectorsTop of page
|Host and vector organisms||Seeds transported to new areas after ingestion and egestion by birds||Yes||Plant Life (2015)|
Environmental ImpactTop of page
Impact on Habitats
G. shallon is a strong competitor for nutrients. In nutrient poor sites it can outcompete trees or other shrubs by being the first species to reach and use the available nutrients (especially nitrogen), reducing other species growth (Prescott et al., 2003; Prescott and Sajedi, 2008). G. shallon can also influence the mineralization of nitrogen through the release of tannins (Prescott et al., 1996).
Impact on Biodiversity
G. shallon can form dense thickets through the development of suckers from roots and rhizomes. As a result, G. shallon can rapidly take over large areas as the thickets can shade out any vegetation underneath and provide very little growing space for other species. This can decrease plant diversity in particular that of shade intolerant species.
Risk and Impact FactorsTop of page
- Invasive in its native range
- Proved invasive outside its native range
- Has a broad native range
- Abundant in its native range
- Tolerant of shade
- Highly mobile locally
- Long lived
- Has high reproductive potential
- Has propagules that can remain viable for more than one year
- Reproduces asexually
- Damaged ecosystem services
- Ecosystem change/ habitat alteration
- Modification of nutrient regime
- Negatively impacts agriculture
- Negatively impacts forestry
- Reduced native biodiversity
- Competition - monopolizing resources
- Competition - shading
- Competition - smothering
- Highly likely to be transported internationally deliberately
UsesTop of page
In the Pacific Northwest, G. shallon is the heart of a local but important industry of cut flowers and therefore has some economic value. Wild G. shallon boughs are harvested and used as a floral green in floral arrangements (Ballard and Huntsinger, 2006).
G. shallon berries were a large component of traditional North American diets due to their abundance and ease of harvest. Several tribes have used the berries as part of feasts, mixed with salmon eggs and the leaves as hunger suppressant (Pojar and MacKinnon, 2004). G. shallon can be sustainably harvested for a large number of years before the growth of the plant is reduced, as it is frugal in nutrient needs and regenerates quickly. G. shallon berries taste similar to, the bilberries (Vaccinium myrtillus), another member of the Ericaceae family. Fruits can be eaten raw, cooked or dried for later use (Grieve, 1971; Hedrick, 1972; Simmons, 1972; Facciola, 1998; Pojar and Mackinnon, 2004). Dried fruits are used as sweeteners and in jams, preservatives, or drinks (Facciola, 1998). The leaves can be used for making tea (Turner, 1979). Several traditional and natural dyes have been created from G. shallon. From the berries it is possible to obtain a dark purple dye and green-yellow dye from the infusion of the leaves (Moerman and Eierman, 1998).
In traditional medicine, G. shallon has been used as an astringent, a poultice and a stomach tonic. The poultice consists of a mixture of the toasted, pulverized leaves. The plaster can be applied to cuts and insect bites and leaves can be chewed and applied to burns and sores. The stomach tonic is made from an infusion of the leaves and helps to reduce internal inflammation such as stomach ulcers, heart burn, treat diarrhea, period pain, coughs and tuberculosis (Moerman and Eierman, 1998).
Environmental services within forest and wetland ecosystems provided by G. shallon in its native range include supporting services such as primary production, nutrient recycling and soil formation, regulating services such as carbon sequestration, erosion control and soil stability and hydrological stabilization. Mammals which may use the berries as food include the red squirrel (Sciurus vulgaris), Townsend's chipmunk (Neotamias townsendii), Douglas' squirrel (Tamiasciurus douglasii) and the black bear (Ursus americanus). In the UK cattle will also feed on the berries. In its native range the fruit are a good food source for birds such as the blue grouse (Dendragapus species) and the band-tailed pigeon (Patagioenas fasciata). In addition to this, in both its native and introduced range many species of songbirds feed on the fruit when available. Hummingbirds may also feed on the flowers.
G. shallon is also an important plant in gardening, especially in its native range and in many parts of North America. It is often used as a ground cover plant for a shady position under trees which spreads slowly by means of suckers (Brickell, 2010). G. shallon may also be used to make green fences for which seedlings should be spaced about 90 cm apart each way (Thomas, 1970). The reason for this is that G. shallon can grow very rapidly and densely. G. shallon is often used to “deer-proof” gardens as the foliage is very dense and usuaally not favored by deer. However, other thicket forming species may better serve in this role
Uses ListTop of page
Animal feed, fodder, forage
- Invertebrate food
- Erosion control or dune stabilization
- Land reclamation
- Botanical garden/zoo
Human food and beverage
- Beverage base
- Emergency (famine) food
- Leaves (for beverage)
Detection and InspectionTop of page
G. shallon can be identified using the 'Key to Genera and Species for Ericaceous' plants provided by the Flora of North America Editorial Committee (2015).
Prevention and ControlTop of page
Due to the variable regulations around (de)registration of pesticides, your national list of registered pesticides or relevant authority should be consulted to determine which products are legally allowed for use in your country when considering chemical control. Pesticides should always be used in a lawful manner, consistent with the product's label.
Outside of its native range it is important that foresters, cattle ranchers, protected areas managers and the general public are made aware of the existence of this shrub in the regions that they work so they can try to control its spread.
Mechanical control is often ineffective with G. shallon owing to its capacity to sprout from rhizomes. In fact, if applied carelessly it may be counter effective and increase spread (USDA Forest Service, 2015).
Fire is not recommended as an eradication measure, as fire can consume the aboveground part, but the shrub can survive by regeneration from the underground structures (Yerkes, 1960; Hawkes et al., 1990).
Control of this species by biological control is currently being considered. Potential biocontrol agents include a number of fungal pathogens identified as natural enemies of G. shallon (Shamoun and Zhao, 2005; Zhao and Shamoun, 2006).
In the UK, cattle ranching can be used to break continuous thickets and reduce G. shallon to a mere component of heathland vegetation.
Fertilization in mixed forests with presence of G. shallon ensures adequate levels of nutrients for trees and other canopy vegetation, reducing the competitive effect of G. shallon (Prescott et al., 2003; Blanco, 2007). G. shallon is resistant to many herbicides including 2,4-D, 2,4,5-T, amitrole, picloram and silvex (fenoprop) (Stewart, 1974a; Bovery, 1977; Otchera-Boateng and Herming, 1990). Mode of herbicide application, season and site characteristics all have a great influence on the response of G. shallon to herbicides (Stewart, 1974b; D’anjou, 1990). Herbicides are however often impractical or prohibitively expensive to be effective, owing to the need for repeated application. G. shallon is most susceptible to foliage sprays at budbreak, although many plants recover later from damage (Stewart, 1974b).
Gaps in Knowledge/Research NeedsTop of page
Additional research on the ability to reduce the spread of G. shallon through changes in soil fertility (fertilization and other soil amendments, planting of preferred species) is recommended.
ReferencesTop of page
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22/04/15 Original text by:
Yueh-Hsin Lo, Universidad Pública de Navarra, Spain.
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