Print Email Comment share on Facebook Share on twitter
Print this page
Email link to this page
Send comments about this page
Share on facebook
Share on twitter

Solidago nemoralis (Asteraceae)

Gray goldenrod

 

The EPPO Panel on Invasive Alien Plants made a first categorization of alien invasive plants. As Solidago nemoralis is advertised for landscaping purposes in Europe without any thorough analysis of its potential invasiveness, the Panel considered in 2004 that it should be added to the EPPO Alert List. In 2012, as no immediate risk was perceived, it was transferred to the Observation List.

 

Description
S. nemoralis is a perennial, slender plant (0.3-0.5 m tall). Leaves are alternate. Basal and rosette leaves are long, oval, and tapered at base with serrations on the distal half. Stalk leaves are oval and tapered at both ends. All leaves have distinct midrib and web-like venation. The inflorescence is a cluster of yellow flowers all growing on one side of the stalk. In North America, it flowers in August-September. Achenes then develop with tufts of hair and are dispersed by the wind.
Pictures can be viewed :
http://www.indiana.edu/~preserve/nature/floral_inventory/pages/sol_nem.htm
http://www.shout.net/~jhilty/plantx/fld_goldenrodx.htm

Where
North America: Canada, USA (Alabama, Arkansas, Connecticut, Delaware, Illinois, Indiana, Iowa, Kansas, Maine, Maryland, Massachusetts, Michigan, Missouri, New Hampshire, New Jersey, New York, Ohio, Oklahoma, Pennsylvania, Rhode Island, Texas, Vermont, Virginia, West Virginia).

Habitat
Prairies (growing on black soil, gravel, sand), dry and sandy fields, sandy roadsides, railroads, dunes, Quercus velutina savannas, eroded clay banks, abandoned fields.

Damage
In some Western states in USA, it is considered as a troublesome weed. Chemical treatments are mentioned in the literature in apple orchards, pastures, and soybean fields. In the USA, no environmental or social impact is mentioned. In its native range S. nemoralis is not considered as a noxious weed or invasive species. Data is lacking on possible hybridization with other Solidago species. However, S. nemoralis shares some similiarities with other Solidago species which are invasive in Europe (e.g. S. canadensis, S. gigantea). It is reported that, at suitable locations, S. nemoralis has a tendency to form colonies. It survives in difficult locations (slopes, poor soil) where little else will grow. It produces large number of highly viable seeds and vegetative spread is considered as rapid. It can stand low temperatures (-30C°).

Dispersal
Local dispersal is mainly ensured by seeds. Plants can also be spread by rhizomes when soil or plants are disposed of. Over long distances, trade of plants and seeds can disseminate S. nemoralis.

Pathway
Plants for planting, seeds of S. nemoralis (soil with viable rhizomes or seeds?).

Possible risks
It shares characteristics with other Solidago species which are invasive in Europe and in other parts of the world. Control methods are available (herbicides, mowing) but may be difficult to apply in natural or semi-natural environments. This plant is planned to be planted in Europe in public spaces, motorway verges, embankments for landscaping purposes. Considering its high seed production, rapid seed spread and vegetative spread, it could present a risk to the EPPO region as it could outcompete native species including endangered species (e.g. in natural grasslands competing with orchids). However, more data is needed on possible habitats at risk in Europe, and plant biology. Introduction of this species for landscaping purpose should be avoided, native species or alien plants with no history of invasiveness in Europe should be substituted for it.

Sources
Kapusta, G.; Krausz, R.F. (1993) Weed control and yields are equal in conventional, reduced-, and no-tillage soybean (Glycine max) after 11 years. Weed-Technology, 7(2), 443-451.
Peters, E.J. (1983) Effectiveness and safety of translocated herbicides applied to pasture weeds with a rope-wick applicator. Proceedings of the XIV International Grassland Congress, held at Lexington, Kentucky, U.S.A., June 15-24, 1981 [Smith, J.A.; Hays, V.W. (Editors)], 553-555.
Peters, E.J.; Lowance, S.A. (1978) Effects of multiple mowing on western ironweed (Vernonia baldwinii) and gray goldenrod (Solidago nemoralis). Weed-Science, 26(2), 190-192.
Schrader, G., Baker, R. (2003) Draft Report of a pest risk assessment of Solidago nemoralis. Unpublished document.
Weller, S.C. (1984) Post-emergence weed control in orchards. Proceedings, North Central Weed Control Conference, Vol.39, p 145.
INTERNET
Prairie Wildflowers of Illinois. Field Goldenrod – Solidago nemoralis. http://www.shout.net/~jhilty/plantx/fld_goldenrodx.htm
USDA Natural Resources Conservation Service. Plant Profile. Solidago nemoralis. http://plants.usda.gov/cgi_bin/plant_profile.cgi?symbol=SONEN
Solidago nemoralis. http://plants.usda.gov/cgi_bin/plant_attribute.cgi?symbol=SONE

EPPO RS 2004/042
Entry date 2004-04 / 2012-05

 

Back