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Datasheet

Dipsacus fullonum
(common teasel)

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Datasheet

Dipsacus fullonum (common teasel)

Summary

  • Last modified
  • 06 November 2018
  • Datasheet Type(s)
  • Invasive Species
  • Preferred Scientific Name
  • Dipsacus fullonum
  • Preferred Common Name
  • common teasel
  • Taxonomic Tree
  • Domain: Eukaryota
  •   Kingdom: Plantae
  •     Phylum: Spermatophyta
  •       Subphylum: Angiospermae
  •         Class: Dicotyledonae
  • Summary of Invasiveness
  • D. fullonum is a biennial plant native to North Africa, Europe and West Asia. It has been introduced to North and South America, Australia and New Zealand. Although mainly a weed of pastures and roadsides, it s...

  • Principal Source
  • Draft datasheet under review

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Pictures

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PictureTitleCaptionCopyright
Dipsacus fullonum (common or Fuller's teasel); flower head.
TitleFlower head
CaptionDipsacus fullonum (common or Fuller's teasel); flower head.
Copyright©Trevor James/Hamilton, New Zealand-2014
Dipsacus fullonum (common or Fuller's teasel); flower head.
Flower headDipsacus fullonum (common or Fuller's teasel); flower head.©Trevor James/Hamilton, New Zealand-2014
Dipsacus fullonum (common or Fuller's teasel); mature plants, bearing seed heads.
TitleMature plants
CaptionDipsacus fullonum (common or Fuller's teasel); mature plants, bearing seed heads.
Copyright©Trevor James/Hamilton, New Zealand-2014
Dipsacus fullonum (common or Fuller's teasel); mature plants, bearing seed heads.
Mature plantsDipsacus fullonum (common or Fuller's teasel); mature plants, bearing seed heads.©Trevor James/Hamilton, New Zealand-2014
Dipsacus fullonum (common or Fuller's teasel); vegetative rosette.
TitleVegetative rosette
CaptionDipsacus fullonum (common or Fuller's teasel); vegetative rosette.
Copyright©Trevor James/Hamilton, New Zealand-2014
Dipsacus fullonum (common or Fuller's teasel); vegetative rosette.
Vegetative rosetteDipsacus fullonum (common or Fuller's teasel); vegetative rosette.©Trevor James/Hamilton, New Zealand-2014

Identity

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Preferred Scientific Name

  • Dipsacus fullonum L.

Preferred Common Name

  • common teasel

Other Scientific Names

  • Dipsacus fullonum ssp. fullonum L.
  • Dipsacus fullonum ssp. sylvestris (Huds.) Clapham
  • Dipsacus sylvestris Huds.

International Common Names

  • English: Fuller's teasel; wild teasel

Local Common Names

  • : teasel; wild teasel
  • France: cabaret des oiseaux; cardaire sauvage; cardère des bois; cardère sylvestre; chardon des forês
  • Germany: wilde Karde
  • Sweden: kardvädd

Summary of Invasiveness

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D. fullonum is a biennial plant native to North Africa, Europe and West Asia. It has been introduced to North and South America, Australia and New Zealand. Although mainly a weed of pastures and roadsides, it sometimes also grows in natural communities and forms a large basal rosette of leaves in the early stages of growth. This rosette of leaves can cover a large area and shade other ground-dwelling plants nearby (Weeds of Australia, 2013). Donaldson (2002) claimed that D. fullonum ‘is spreading rapidly throughout the United States except in the northern Great Plains,’ and in the USA it has been classified as a noxious weed in Colorado, Iowa, Missouri and New Mexico (USDA-NRCS, 2013).

Taxonomic Tree

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  • Domain: Eukaryota
  •     Kingdom: Plantae
  •         Phylum: Spermatophyta
  •             Subphylum: Angiospermae
  •                 Class: Dicotyledonae
  •                     Order: Dipsacales
  •                         Family: Dipsacaceae
  •                             Genus: Dipsacus
  •                                 Species: Dipsacus fullonum

Notes on Taxonomy and Nomenclature

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Mabberley (1987) wrote that the genus Dipsacus comprises 15 species in Europe, tropical Africa and Sri Lanka. The specific name ‘fullonum’ and the common name ‘Fuller’s teasel’ both imply that this species was used in fulling, the process of shrinking and thickening the cloth after weaving (Ryder, 1993). Clapham et al. (1962) used the name D. fulllonum ssp. sativus instead of D. sativus for the plant with stiff recurved spines that was long used in the textile industry.

There has been much confusion over the specific name of this species. Cal-IPC (2013) summarised it thus: ‘In past was mistakenly called Dipsacus sylvestris Huds. in some references; binomial D. sylvestris Huds. has been used for wild teasel by majority of authors in North America and the binomial D. fullonum L. reserved for the cultivated teasel - the opposite naming convention is used in Europe.’ The situation is in fact more complicated than that, as Ferguson and Brizicky (1965) have pointed out. Here it is assumed that accounts referring to both D. fullonum and D. sylvestris refer to D. fullonum, and that D. sativus is sometimes regarded as a subspecies of D. fullonum. The Natural History Museum (2013), using the BSBI’s List of British and Irish Vascular Plants and Stoneworts, records D. sativus as a separate species to D. fullonum.

Description

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Slightly modified from Webb et al. (1988), under the name D. sylvestris:

Erect biennial; stems becoming hairless, grooved, with prickles on ridges especially up the stem, becoming hollow, up to about 2 m tall. Basal leaves becoming hairless, elliptic-oblong, crenate but not lobed, narrowed to winged petiole, up to 40 cm long; prickles mostly on veins, especially on midvein of lower surface. Stem leaves similar to basal but smaller, becoming sessile, lanceolate-triangular, the opposite pairs connate at base; uppermost leaves usually entire. Heads terminal, ovoid-cylindrical at flowering, elongating to up to 9 cm long and becoming cylindrical at fruiting; corolla pale purple to pinkish purple. Involucral bracts unequal, linear, curved upwards, the longest often longer than the head at least at flowering, armed with prickles. Receptacular scales with straight or slightly recurved, flexible spine longer than the floret. Achene brown, 4-angled and with longitudinal grooves, 4-5 × 1-1.5 mm.

Plant Type

Top of page Biennial
Broadleaved
Herbaceous

Distribution

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D. fullonum is native to North Africa, Europe and West Asia. It has been introduced to USA, Canada, Argentina, Bolivia, Ecuador, Uruguay, Australia and New Zealand.

Distribution Table

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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.

Continent/Country/RegionDistributionLast ReportedOriginFirst ReportedInvasiveReferenceNotes

Asia

LebanonPresentNativeUSDA-ARS, 2013
SyriaPresentNativeUSDA-ARS, 2013
TurkeyPresentNativeUSDA-ARS, 2013

Africa

AlgeriaPresentNativeUSDA-ARS, 2013
MoroccoPresentNativeUSDA-ARS, 2013
TunisiaPresentNativeUSDA-ARS, 2013

North America

CanadaPresentPresent based on regional distribution.
-British ColumbiaPresentIntroducedUSDA-ARS, 2013
-OntarioPresentIntroducedUSDA-ARS, 2013
-QuebecPresentIntroducedUSDA-ARS, 2013
USAPresentPresent based on regional distribution.
-AlabamaPresentIntroducedUSDA-NRCS, 2013
-ArizonaPresentIntroducedUSDA-NRCS, 2013
-ArkansasPresentIntroducedUSDA-NRCS, 2013
-CaliforniaPresentIntroducedUSDA-NRCS, 2013
-ColoradoPresentIntroducedUSDA-NRCS, 2013
-ConnecticutPresentIntroducedUSDA-NRCS, 2013
-DelawarePresentIntroducedUSDA-NRCS, 2013
-District of ColumbiaPresentIntroducedUSDA-NRCS, 2013
-IdahoPresentIntroducedUSDA-NRCS, 2013
-IllinoisPresentIntroducedUSDA-NRCS, 2013
-IndianaPresentIntroducedUSDA-NRCS, 2013
-IowaPresentIntroducedUSDA-NRCS, 2013
-KansasPresentIntroducedUSDA-NRCS, 2013
-KentuckyPresentIntroducedUSDA-NRCS, 2013
-MarylandPresentIntroducedUSDA-NRCS, 2013
-MassachusettsPresentIntroducedUSDA-NRCS, 2013
-MichiganPresentIntroducedUSDA-NRCS, 2013
-MississippiPresentIntroducedUSDA-NRCS, 2013
-MissouriPresentIntroducedUSDA-NRCS, 2013
-MontanaPresentIntroducedUSDA-NRCS, 2013
-NebraskaPresentIntroducedUSDA-NRCS, 2013
-NevadaPresentIntroducedUSDA-NRCS, 2013
-New HampshirePresentIntroducedUSDA-NRCS, 2013
-New JerseyPresentIntroducedUSDA-NRCS, 2013
-New MexicoPresentIntroducedUSDA-NRCS, 2013
-North CarolinaPresentIntroducedUSDA-NRCS, 2013
-OhioPresentIntroducedUSDA-NRCS, 2013
-OklahomaPresentIntroducedUSDA-NRCS, 2013
-OregonPresentIntroducedUSDA-NRCS, 2013
-PennsylvaniaPresentIntroducedUSDA-NRCS, 2013
-Rhode IslandPresentIntroducedUSDA-NRCS, 2013
-South DakotaPresentIntroducedUSDA-NRCS, 2013
-TennesseePresentIntroducedUSDA-NRCS, 2013
-TexasPresentIntroducedUSDA-NRCS, 2013
-UtahPresentIntroducedUSDA-NRCS, 2013
-VermontPresentIntroducedUSDA-NRCS, 2013
-VirginiaPresentIntroducedUSDA-NRCS, 2013
-WashingtonPresentIntroducedUSDA-NRCS, 2013
-West VirginiaPresentIntroducedUSDA-NRCS, 2013
-WisconsinPresentIntroducedUSDA-NRCS, 2013
-WyomingPresentIntroducedUSDA-NRCS, 2013

South America

ArgentinaPresentIntroducedUSDA-ARS, 2013
BoliviaPresentIntroducedUSDA-ARS, 2013
ColombiaPresentIntroducedGBIF, 2014
EcuadorPresentIntroducedUSDA-ARS, 2013
PeruPresentIntroducedGBIF, 2014
UruguayPresentIntroducedUSDA-ARS, 2013

Europe

AlbaniaPresentNativeUSDA-ARS, 2013
AndorraPresentGBIF, 2014
AustriaPresentNativeUSDA-ARS, 2013
BelgiumPresentNativeUSDA-ARS, 2013
BulgariaPresentNativeUSDA-ARS, 2013
Czechoslovakia (former)PresentNativeUSDA-ARS, 2013
DenmarkPresentNativeGBIF, 2014
FrancePresentNativeUSDA-ARS, 2013
GermanyPresentNativeUSDA-ARS, 2013
GreecePresentNativeUSDA-ARS, 2013
HungaryPresentNativeUSDA-ARS, 2013
IrelandPresentNativeUSDA-ARS, 2013
ItalyPresentNativeUSDA-ARS, 2013
LuxembourgPresentNativeGBIF, 2014
MoldovaPresentNativeUSDA-ARS, 2013
NetherlandsPresentNativeUSDA-ARS, 2013
NorwayPresentNativeGBIF, 2014
PolandPresentNativeUSDA-ARS, 2013
PortugalPresentNativeUSDA-ARS, 2013
RomaniaPresentNativeUSDA-ARS, 2013
SlovakiaPresentNativeGBIF, 2014
SloveniaPresentNativeGBIF, 2014
SpainPresentNativeUSDA-ARS, 2013
SwedenPresentNativeGBIF, 2014
SwitzerlandPresentNativeUSDA-ARS, 2013
UKPresentNativeUSDA-ARS, 2013
UkrainePresentNativeUSDA-ARS, 2013

Oceania

AustraliaPresentIntroducedUSDA-ARS, 2013
-New South WalesPresentIntroduced Invasive Weeds of Australia, 2013
-TasmaniaPresentIntroduced Invasive Weeds of Australia, 2013
-VictoriaPresentIntroduced Invasive Weeds of Australia, 2013
New ZealandPresentIntroduced Invasive Webb et al., 1988

History of Introduction and Spread

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D. fullonum is native to North Africa, Europe and West Asia (Weeds of Australia, 2013), and was introduced to North America reputedly as early as the 1700s (Donaldson, 2002), and reached Canada in 1877 (Werner, 1975). The first recorded collection in Australia was in 1893 (Royal Botanic Gardens Sydney, 2013), and in New Zealand its presence was first reported by Kirk (1877) as occurring in great abundance in the Porirua Valley near Wellington. Given the confusion over the nomenclature of D. fullonum and D. sativus, the species may have been introduced to both Australia and New Zealand to support their burgeoning wool industries.

In contrast, the true fullers’ teasel (D. sativus or D. fullonum ssp. sativus) is not known in the wild, has rarely become naturalized and is largely recorded as a remnant of a former crop. Only two records occur in Australia’s Virtual Herbarium (Royal Botanic Gardens Sydney, 2013), and only one fairly recent location is recorded in New Zealand, although it was formerly cultivated for the woollen trade (Thomson, 1922). Ryder (1993) reported the historical cultivation and use of teasels in the wool industry in Britain and on the small area on which teasels were grown in the 1960s. According to Topham (1968), citing Nelson (1960), crops of this species were at one stage grown in Oregon and also near the town of Skaneateles, New York.

Gucker (2009) reported that D. fullonum spread rapidly in the USA, often along roads and waterways, and suggested that right-of-way mowing operations have been important in the spread.

Introductions

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Introduced toIntroduced fromYearReasonIntroduced byEstablished in wild throughReferencesNotes
Natural reproductionContinuous restocking
Australia 1893 Crop production (pathway cause) Yes Australia’s Virtual Herbarium (2013); Royal Botanic Gardens Sydney (2004); Royal Botanic Gardens Sydney (2013) First Australian record (Southern Midlands, Tasmania
New Zealand 1877 Crop production (pathway cause) Yes THOMSON (1922) ‘in great abundance in Porirua Valley’
USA Early 1700s Yes Donaldson and Rafferty (2002) Unsubstantiated

Risk of Introduction

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The seedheads of D. fullonum are often used in dried flower arrangements and the transfer of seeds still trapped in the seedheads from country to country or within countries could be a source of new introductions. There are many sites online selling seeds and this is another possible high risk pathway for introductions. Introduction in contaminated crop seed is unlikely, because D. fullonum seed ought to be identified in phytosanitary searches.

Habitat

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Weber (2003, cited in Gucker, 2009) reported that D. fullonum is found in similar habitats in both its native and introduced ranges, including riparian areas, meadows, grasslands, savannahs, forest openings and disturbed sites. It is also found on the upper reaches of salt marshes (Badger and Ungar, 1994), its tolerance of saline conditions playing a part in its occupation of roadsides where salt is used for de-icing (Beaton and Dudley, 2004). In Canada, Werner (1975b) reported that the species grows on a variety of soils from sandy soils with abundant moisture to heavy clays in poorly drained areas. In New Zealand, Popay et al. (2010) described its habitat as roadsides, abandoned pasture, cultivated land, riverbeds and waste places.

Habitat List

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CategorySub-CategoryHabitatPresenceStatus
Terrestrial

Hosts/Species Affected

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The invasion of D. fullonum in New Mexico may adversely affect Cirsium vinaceum, an endemic thistle that is federally listed as threatened (Huenneker and Thomson, 1995). In Australia it sometimes grows in natural communities, where it forms a large basal rosette of leaves that can cover a large area and shade nearby ground-dwelling plants (Weeds of Australia, 2013).

Biology and Ecology

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Genetics

2n = 18 (Clapham et al., 1962; Werner, 1975b).

Reproductive Biology

The flowers are protandrous, the stamens ripening before the pistil. Flowers are visited by bumblebees (Bombus spp.) and other smaller bees which collect pollen and become covered in it (Werner, 1975b). The same author found that if cross-pollination was prevented, only 4% of seeds were viable, compared with 70% or more with cross-pollination.

Within a flower head, flowers first mature in a ring about half-way up the head. One ring then moves upwards and another downwards over several weeks (Werner, 1975b). Although in the related D. laciniatus the primary head completed flowering within four days after initial flowering, it took 45 days before 90% of all the heads on the plant had flowered (Bentivegna and Smeda, 2011).

Werner (1975b) observed that the number of seeds per inflorescence was governed by the length of the core of the flowering head. The average number of potential seeds per head was about 855 and the number of fertilised seeds was estimated at about 727. The same author found that the number of inflorescences per plant was usually 3-9, but sometimes as many as 35.

In the related D. laciniatus, germinable seed was observed only nine days after flowering (Bentivegna and Smeda, 2011).

Physiology and Phenology

In Canada, seeds are dispersed in autumn but few seedlings are found before the next spring (Werner, 1975b). Seeds harvested in October germinated readily, with over 70% germination, and with no apparent need for freezing or stratification. Seeds stored dry for up to six years showed only a slight decline in viability over that time, although older seeds took longer to germinate.

In the English midlands, seedlings of D. fullonum started to emerge soon after sowing in autumn and continued to emerge throughout winter and for most of the following year (Roberts, 1986). In later years flushes occurred after cultivation of the surface soil, especially in April (spring) and to a much lesser extent in September, but sporadically at other times, and seedlings continued to emerge for as long as the five years of observations. Werner (1975b) similarly found that seeds germinated mainly from early April to June, although a few germinated in early September. Bentivegna and Smeda (2011), working with the related species D. laciniatus in Missouri, USA, found that 95% of germination occurred in April and October.

D. fullonum produces a stout taproot, which can be more than 0.6 m long and 2.5 cm thick at the crown (Gucker, 2009). The plant first develops a rosette which can be 51 cm or more across (Werner, 1975c). Once the rosette is large enough (occasionally after one season, but sometimes after several years) and temperature and day length conditions are right, the tall flowering stem begins to grow out of the old rosette base (in May in Canada ) and reaches its full height of up to 2-3 m (in July in Canada) (Werner, 1975b). Flowers are continually produced from July to early September: seeds mature in the head and are dispersed from September to late November. The seeds germinate from early April to early June and the rosettes that develop continue to increase in size until late autumn (Werner, 1975b). During winter the rosette leaves often become brownish-green and some may die.

Beaton and Dudley (2004) found that populations of D. fullonum from roadsides in Ontario, where they are exposed to salt used for winter de-icing, were more tolerant of salinity than old-field populations not exposed to salt. The authors speculated that this tolerance was the result of a maternal environmental effect rather than a genetic one. The same authors (Beaton and Dudley, 2007) explored this further and deduced that D. fullonum has two distinct salt-tolerance strategies: a) osmotic stress tolerance, as a result of the parent plant modifying the chemical composition of the seeds to confer salinity tolerance during germination, and b) an inherent ability to tolerate high salinity levels. In further work, Beaton and Dudley (2013) found that families of D. fullonum from roadside populations showed greater tolerance of both high salinity and drought than families from old-field populations, but that no maternal family had tolerance to both drought and salinity, suggesting that the two traits are separate in this species.

Longevity

Seeds can survive in the soil for at least 5 years (Roberts, 1986). Plants of D. fullonum can remain as rosettes for between two and at least four years in Canada, where most seedlings emerge in autumn (Werner, 1975b). Length of survival depended on the kind of plants present in the community. In fields where cover was 65-72% of Elymus repens plants grew from seedlings to flowering in two years: in habitats where the other vegetation was taller flowering could take place after three or four years (Werner, 1975c). In one field with an understorey of herbaceous perennials and a shrub cover of over 50%, all rosettes died within five years without flowering.

Population Size and Structure

Werner (1975b) said that even in large populations of D. fullonum individual plants are usually spaced 0.5 to 1.5 m apart, although in one population in Michigan the author observed about 13 flowering stalks and 7 mature rosettes per square metre. The same author suspected that teasel numbers fluctuate greatly and that the spread of a population is relatively slow by comparison with some other weeds, as generation time is longer than one year and no vegetative reproduction occurs. The author also found that in a range of fields where seeds were sown in the winter of 1968/1968 and plants then established, the annual number of seeds produced was about the same in 1973, regardless of the number of plants (whose ground cover ranged from 2.3% to almost 40%) or the age of the plants.

Nutrition

Darwin (1877) suggested that the filamentous hairs on the leaves of D. fullonum may have the function of absorbing nitrogenous fluids ‘accumulating within the connate leaves of the plant.’ He speculated that the source of the nitrogen was ammonia in the rain and dew. The opposite leaves are connate, joined together at the base to form a cup-shaped structure in which rain or dew collect. Christy (1923) suggested that the purpose of these ‘cups’ is to serve as a mortuary for insects (and other invertebrates) and that the plant somehow benefits from the presence of these dead creatures, a supposition partly tested by Shaw and Shackleton (2011), who found that seed production and the seed mass:biomass ratio was greater in plants that were ‘fed’ maggots. As the authors suggest, the result needs duplication, and also begs other questions, such as: are insects attracted to the fluid, how are they digested, and do plant structures cause insects to fall into the fluid?

Associations

D. fullonum is found in many different places and thus associates with many other plant species. Werner (1975b) reported that it and other species of Dipsacus are found mainly (in Canada) in the later stages of succession of abandoned crop or hay fields, on roadsides, along irrigation ditches and creeks, and in other disturbed areas. The author added that both the rosette and flowering stages usually grow in open sunlight with leaf surfaces above dead plant litter or other vegetation.

Environmental Requirements

The largest plants are found when conditions are such that soil moisture is relatively high throughout the growing season (Werner, 1975b). D. fullonum does not grow in areas with prolonged cold periods.

Notes on Natural Enemies

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Sforza (2004) and Rector et al. (2006) searched for natural enemies of D. fullonum and D. laciniatum by surveying literature and conducting field searches in their native ranges. These authors found 102 species of insects, 27 fungi, three mites, one nematode and two viruses damaging these species, of which six species (three insects, one mite and two fungi) were considered worthy of further assessment. These were: Chromatomyia ramosa (Hendel) (Diptera: Agromyzidae), Longitarsus strigicollis Wollaston (Coleoptera: Chrysomelidae), Epitrimerus knautiae Liro (Acarina: Eriophyiidae), Euphydryas desfontainii (Godart) (Lepidoptera: Nymphalidae), Erysiphe knautiae Duby (Erysiphales: Erysiphaceae) and Sphaerotheca dipsacearum (Tul. and C. Tul.) (Erysiphales: Erysiphaceae).

Dugan and Rector (2007) conducted a preliminary survey of seed mycoflora of D. fullonum in Washington State in the Pacific Northwest of the USA. In symptomatic seed they found a high rate of colonisation by Cladosporium and Alternaria spp., both of which can cause damping off in seedlings, and, in asymptomatic seed, a high rate of colonisation by Aureobasidium pullulans. However, they did not succeed in infecting D. fullonum seedlings with conidial suspensions of any of these fungi.

Means of Movement and Dispersal

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Natural Dispersal (Non-Biotic)

The seeds of D. fullonum have no morphological characteristics to aid dispersal. Werner (1975a) tested the dispersal of seeds from 2 m tall plants, each with 5-9 heads. Wind speed was zero but the bases of the plants were lightly tugged to simulate movement by wind or passing animals. 95% of seeds fell within 1 m and 99.9% within 1.5 m of the parent plant. However, any seeds that fall and are washed into moving water could be dispersed much further, as seeds can float in water, unharmed, for up to 22 days (Werner 1975a). Comes et al. (1978) found that almost all seeds stored 30 cm below the surface of a canal in Washington, USA, did not survive for as long as 3 months.

Vector Transmission (Biotic)

Human transmission of seed is likely as the seed heads are often used in dried flower arrangements (Gucker, 2009). Donaldson and Rafferty (2002) pointed out that it is common around cemeteries, where dried seed heads are often left in floral arrangements. Mowing the springy stems may help spread the population: Parrish et al. (2005) measured the spread of mown and unmown areas of the related D. laciniatus and found that unmown patches increased by 4.2 m2 after two years of mowing, but that mown patches increased by 33m2.

Accidental Introduction

The most likely route of accidental introduction is through dried flower arrangements taken legally or illegally into other countries (Gucker, 2009).

Intentional Introduction

The transport of dried flower arrangements is also the most likely source of intentional introduction to new countries or locations, again either legally or illegally.

Pathway Causes

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CauseNotesLong DistanceLocalReferences
Industrial purposes Yes Yes

Impact

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D. fullonum can develop large, dense infestations under some circumstances (Weber, 2003), affect riparian habitats and occupy habitats important to threatened plant species (Gucker, 2009). On the other hand, diversity and species richness were higher in early seral fields where D. fullonum was present than in comparable fields from which it was absent (Werner, 1977).

Gucker (2009) cited publications that make the species appear to be a more serious problem, although these are mostly anecdotal. For instance, he cited Taylor (1990) describing the species as ‘truly noxious’ in moist areas in northwest North America, and Weber (2003) noting that stands can exclude other vegetation and may restrict wildlife movement. Cal-IPC (2013) tended to agree, reporting that it has impacted threatened species in states other than California, and that it can form a dense and persistent litter or thatch layer. In addition, dead stems and flower heads of D. fullonum can persist for more than a year, reducing light levels at ground level, thus shading out native or desirable plants. In Australia, it is regarded as an environmental weed in Victoria and Tasmania.

Economic Impact

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There is little information on any economic impact of D. fullonum on agricultural production. Werner (1975b) pointed out that it is not a serious agricultural weed in Canada, at least in pastures or in annual crops, and rarely becomes established where vegetation is removed every year, as in annual cropping. The same author reported that the plants are smaller where cattle graze and suggested that this due to cattle treading on the rosettes.

Environmental Impact

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Although D. fullonum is found in environmentally sensitive areas and can occasionally form large, dense infestations, there are relatively few reports of it causing serious damage to habitats or to endangered species. Gucker (2009) quotes examples of it possibly affecting American globeflower (Trollius laxus) and water speedwell (Veronica anagallis-catenata) in a limestone fen in New Jersey’s Warren County. The Sacramento Mountain thistle (Cirsium vinaceum), endemic to and possibly threatened in New Mexico by the presence of D. fullonum, was adversely affected when grown in pots with D. fullonum (Huenneker and Thomson, 1995).

In Australia, the species is regarded as an environmental weed in Victoria and Tasmania, because its rosettes can be large and can shade nearby ground-dwelling plants (Weeds of Australia, 2013).

Impact on biodiversity

Diversity and species richness were higher in early seral fields in Michigan old-fields where D. fullonum was present than in comparable fields from which it was absent (Werner, 1977). However in some places D. fullonum seems to threaten the existence of threatened species (Huenneker and Thomson. 1995).

Social Impact

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Werner (1975) reported that, in Canada, D. fullonum can sometimes be a local nuisance where it has established in fallow fields or on roadsides (or along footpaths) and hinders human access.

Risk and Impact Factors

Top of page Invasiveness
  • Proved invasive outside its native range
  • Pioneering in disturbed areas
  • Fast growing
  • Has high reproductive potential
  • Has propagules that can remain viable for more than one year
Likelihood of entry/control
  • Highly likely to be transported internationally deliberately

Uses

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Economic Value

Apart from its value in dried flower arrangements of various kinds, D. fullonum provides a rich source of pollen and nectar (Judd, 1983, quoted in Cheesman, 1998) for bees and other insects. According to Bobrov (1957), when dry, the plant can yield a blue colour similar to indigo but water soluble.

The cultivated teasel D. sativum was in earlier years grown commercially in many places for its use in raising the nap on wool cloth (Ryder, 1993).

Social Benefit

During the eighteenth century, the water collected by the leaves of teasels was thought to remove freckles. It has also been used to soothe sore eyes (Mabey, 1996, quoted in Arkive, 2013).

The following is taken from PFAF (2013):

‘Teasel is little used in modern herbalism, and its therapeutic effects are disputed (Chevallier, 2000). Traditionally it has been used to treat conditions such as warts, fistulae (abnormal passages opening through the skin) and cancerous sores (Chevallier, 2000). The root is diaphoretic, diuretic and stomachic (Chiej 1984). An infusion is said to strengthen the stomach, create an appetite, remove obstructions of the liver and treat jaundice (Grieve, 1996; Chevallier, 2000). The root is harvested in early autumn and dried for later use (Chiej 1984). An infusion of the leaves has been used as a wash to treat acne (Moerman, 1998). The plant has a folk history of use in the treatment of cancer, an ointment made from the roots is used to treat warts, wens and whitlows (Baines, 1985). Duke and Ayensu, 1985). A homeopathic remedy is made from the flowering plant and is used in the treatment of skin diseases (Chiej 1984).’

Similarities to Other Species/Conditions

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The confusion over the names D. fullonum, D. sylvestris and D. sativus is discussed in Notes on Taxonomy and Nomenclature. D. sativus has very stiff bracts ending in recurved spines, wheras D. fullonum has flexible bracts ending in straight spines (The Jepson Herbarium, 2914). 

D. laciniatus, slashed teasel, is also found in North America, but is not so widely naturalised. It has irregularly-cut pinnatifid leaves, white flowers and shorter involucral bracts which are not longer than the florets (Werner, 1975b).

Hybrids occur between D. fullonum and D. laciniatus (Gucker, 2009; Natural History Museum, 2013) and between D. fullonum and D. sativum (Natural History Museum, 2013).

Prevention and Control

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SPS Measures

Border inspections ought to prevent D. fullonum spreading to new countries, but deliberate or accidental transmission of seed heads containing viable ripe seed could occur. Seeds are also freely available on the internet and this is another possible source of newly introduced seeds.

Physical/Mechanical Control

Although cutting leaves and stems to ground level encourages the taproot to resprout, repeat cuttings before flowering effectively eradicates a population (Werner, 1975b), although new seedlings could emerge from seeds in the soil. However, Gucker (2009) cited cases where repeated mowing or cutting had little effect on populations. Cheesman (1998) found that some stems cut before flowering regrew but produced significantly fewer flowerheads than uncut plants. Stems cut during or after flowering produced no new seedheads, and seeds in flowerheads cut at or immediately after flowering failed to germinate. In small infestations flowering stalks could be cut and the cut flowerheads removed from the site (Glass, 1991). Some authors have suggested cutting the plants well below the surface and removing the seedheads (Glass, 1991; Donaldson et al., 2002) as a method of control.

A well-managed uniform pasture ought to prevent invasion of new seedlings. Litter from Agropyron (now Elymus) repens reduced the germination of D. fullonum, possibly as a result of allelopathic chemicals in the litter (Werner, 1975d).

Biological Control

The search is ongoing for biological controls for D. fullonum and D. laciniatum in the USA (Sforza, 2004; Rector et al., 2006). These authors searched for natural enemies of D. fullonum and D. laciniatum by surveying literature and conducting field searches in their native ranges, and identified 102 species of insects, 27 fungi, three mites, one nematode and two viral natural enemies for screening as candidates for biological control. Highest priority for initial study has been assigned to two insects that attack the rosette – the chrysomelid flea beetle Longitarsus strigicollis and the agromyzid fly Chromatomyia ramosa (Rector et al., 2005).

Chemical Control

Glass (1991) suggested using glyphosate or 2,4-D applied to rosettes in late autumn or early spring. Glyphosate is not selective and will kill any green plants it touches; 2,4-D kills or damages many broadleaved species but does not harm most grasses. Donaldson (2002) also suggested using 2,4-D, and also reported that 2,4-D + dicamba or triclopyr + clopyralid, chorsulfuron or metsulfuron can be effective when applied to actively growing rosettes.

Control by Utilization

Gucker (2009) indicated that mice and voles may consume seeds of D. fullonum in the USA, and also reported (citing several observers) that California quail, ring-necked pheasants, crossbills, finches and blackbirds all feed on the seeds. Livestock grazing of either rosettes or flowering plants seems unlikely because of the prickly nature of the leaves and heads.

References

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Principal Source

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Draft datasheet under review

Contributors

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22/06/13: Original text by:

Ian Popay, consultant, New Zealand, with the support of Landcare Research.

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