Ottawa NF Invasive Plants
Several non-native invasive plants are known to occur on the Ottawa National Forest. Some, such as garlic mustard and Eurasian water-milfoil, are uncommon and work is underway to treat all known infestations. Others, such as Japanese barberry and glossy buckthorn, are unfortunately quite abundant. Work is underway to contain these infestations and develop long-term treatment options. There are currently no known federally-listed noxious weeds on the Ottawa National Forest. To help prevent the introduction and spread of invasive plants, the Ottawa National Forest also has an active invasive plant prevention and education program.
Non-native invasive plants of the Ottawa National Forest
New Invader/High Priority
Wild chervil - Anthriscus sylvestris
Autumn olive - Eleagnus umbellatus
Leafy spurge - Euphorbia esula
Giant hogweed - Heracleum mantegazzianum**
Dame's rocket - Hesperis matronalis
Japanese knotweed - Polygonum cuspidatum
Giant knotweed - Polygonum sachalinense
Curlyleaf pondweed - Potamogeton crispus
Stinking willie - Senecio jacobea
Japanese hedgeparsley - Torilis japonica
Garden valerian - Valeriana officinalis
Goutweed - Aegopodium podagraria
Spotted knapweed - Centaurea maculosa
Canada thistle - Cirsium arvense
Crown vetch - Coronilla varia
Orange hawkweed - Hieracium aurantiacum
White sweet-clover - Meliotus alba
Yellow sweet-clover - Melilotus officinalis
Reed canary grass - Phalaris arundinacea
Crack willow - Salix fragilis
Low priority: The following species were also ranked and were assigned a low priority: Artcium minus, Berteroa incana*, Brassica juncea*, B. kaber*, B. napus*, B. rapa*, Bromus inermis, Centaurea diffusa, Chrysanthemum leucanthemum, Cirsium vulgare, Convolvulus arvensis, Dactylis glomerata, Daucus carota*, Hieracium piloselloides, Hypericum perforatum, Lapsana communis, Linaria vulgaris, Lotus corniculata, Lupinus polyphyllus, Myosotis scorpioides, Pastinaca sativa, Phragmites australis, Ranunculus acris, Rosa multiflora, Sonchus arvensis*, Tanacetum vulgare, and Vinca minor.
* = Michigan Noxious Weed,
** = Federal Noxious Weed
High priority: Record and map all sites, treat most sites.
New invaders/High: Record, map and treat all new invaders.
Medium priority: Record and map all sites in natural areas (i.e. not on roadsides); map larger sites anywhere. Treat under selected circumstances.
Low priority: Map only large infestations in natural areas. Treat only under special circumstances (e.g. wilderness).
The ONF invasive plant priority list was developed using the Alien Plants Ranking System (version 7.1), a computer program developed by the National Park Service, Northern Arizona Univerisity, Ripon College, University of Minnesota, and the U.S. Geological Survey. See links for more information. The list was approved by the Ottawa National Forest Management Team on April 13, 2005. Comments and questions on the list are welcome. The ranking and list may be revised as new information is gathered.
Invasive Plant Priority List (1 page PDF)
Map of invasive plants on the Ottawa National Forest
Ottawa NF Invasive Plant Report Form
Invasive Plants of the Upper Peninsula Slide Show (Powerpoint, 28 MB)
Buckthorn, barberry and honeysuckle (slide show with notes)
Invasive plant educational materials
Don't judge species on their origins (Nature 2011)
Tenderfoot Creek exotic honeysuckle photos.
Ottawa National Forest knapweed biocontrol.
Ottawa National Forest Non-Native Invasive Plant Control Project