Erigeron canadensis L.

Code

ERICA

Growth form

broadleaf

Biological cycle

annual

Habitat

terrestrial

Algeria: Erigeron canadensis can germinate throughout the year; flowering takes place from February to November.
China: Erigeron canadensis flowers and fruits from May to September.
Morocco: Erigeron canadensis flowers from June to November.
West Indies: Erigeron canadensis flowers almost all year round.

Erigeron canadensis is an annual species, it multiplies by its silky seeds easily carried by the wind.

Erigeron canadensis is an anemochorus species.

Erigeron canadensis can be confused with Erigeron sumatrensis; the latter is distinguished by its larger size reaching 2 m in height and the size and color of the leaves and flower heads: long lanceolate leaves of 3 to 14 cm irregularly lobed or toothed, grayish; ovoid flower heads of 5 to 8 mm by 4 mm, densely pubescent and cream-colored.

Erigeron canadensis is a C3 species.

Algeria: Erigeron canadensis is a fairly common species in annual (especially vegetables) and perennial (especially citrus) crops in the north of the country. The species is also found along the banks of wadis and irrigation canals, in gardens and ruderal habitats, developing on all types of soils provided that they are rich enough in nitrogen.
China: Erigeron canadensis is a common weed in open areas, along field margins, roadsides and dry riverbeds, at altitudes of 0 to 3000 m.
Comoros: Absent
Madagascar: E. canadensis grows on any type of unflooded, moderately fertile soil on sunny land in semi-intensive croping systems and pastures. It is a cosmopolitan weed that is increasingly frequent, especially in the city and in the suburbs, on the edges of roads and railways, in the regions of Madagascar with sub humid and humid climate.
Mauritius: Weed of crops or ruderal on the roadside, in wasteland. It has been found in all the agro-climatic zones of Mauritius.
Morocco: Erigeron canadensis is a common, naturalized exotic species. It is a ruderal of pastures, rubble and damp wasteland in anthropized environments, on sandy soil and degraded wadi beds, up to 1500 m altitude.
Reunion: A species native to temperate regions, present above 400 m altitude (upper part of Trois Bassin, Cilaos, River of ramparts) as a ruderal species and in crops.
West Indies: Erigeron canadensis is a ruderal species. It is sometimes abundant at the back of sandy beaches. Present from 0 to 700 m altitude.

Local harmfulness

Algeria: Erigeron canadensis is a minor weed. It is infrequent and not very abundant, and is generally not a hindrance to cultivation. The impact of this species on natural environments is almost nil because it only colonizes naturally disturbed habitats such as the banks of wadis.
Comoros: Absent.
Madagascar: Erigeron canadensis is a low-frequency weed in crops with an equally low abundance. This weed mainly infests wasteland, roadsides, fallows and pastures in periurban areas and in densely populated parts of the Central Highlands. The fight against this weed does not present any particular difficulties; from a certain density it can lead to the degradation of pastures.
Mauritius: It can have medium to high harmfulness in young sugar canes and other crops when it is abundant.
Reunion: Common but infrequent weed of sugar cane in the Western Highlands. It is also found in vegtable crops in Cilaos.

Medicinal: Erigeron canadensis has balsamic, antirheumatismal, diuretic properties. The flowery aerial part has diuretic and anti-inflammatory properties. It is also used in the treatment of hemorrhoids.

Local control

Madagascar: Erigeron canadensis is controlled by manual weeding with manual tools such as angady to clean fields, pastures and green spaces.
Mauritius: Can be manually removed or effectively controlled by herbicide mixtures recommended for sugar cane.

Herbarium pictures ReCOLNAT: https://explore.recolnat.org/search/botanique/simplequery=Erigeron%2520canadensis