Chicago Botanic Garden

Plant Science — Conservation

Invasive Plants in the Chicago Region

Shrubs

 

Plants with a dash under the "alternatives" column are not commonly used ornamentally. You can find more information on alternatives at Illinois' Best Plants or www.bestplants.org.

SHRUBS
Species Common Name Status Alternatives
Berberis thunbergii Japanese barberry R species
E cultivars
Physocarpus opulifolius (ninebark), Ribes odoratum (clove currant)
Berberis vulgaris European barberry R Physocarpus opulifolius (ninebark), Ribes odoratum (clove currant)
Cotoneaster multiflorus Many-flowered cotoneaster P Physocarpus opulifolius (ninebark), Ribes odoratum (clove currant)
Elaeagnus angustifolia Russian olive W Aesculus parviflora (bottlebrush buckeye), Aronia melanocarpa (black chokeberry), Corylus americana (American filbert)
Elaeagnus umbellatus Autumn olive R Aesculus parviflora (bottlebrush buckeye), Aronia melanocarpa (black chokeberry), Corylus americana (American filbert)
Euonymus alatus Winged euonymus R Euonymus americanus (American strawberry bush), Itea virginica (Virginia sweetspire), Rhus copallina var. latifolia 'Morton' (Prairie Flame shining sumac)
Euonymus europeaus European spindletree R Euonymus americanus (American strawberry bush), Itea virginica (Virginia sweetspire)
Hippophae rhamnoides Common sea buckthorn R ______
Ligustrum obtusifolium Border privet P Physocarpus opulifolius (ninebark), Ribes odoratum (clove currant)
Ligustrum vulgare Common privet P Physocarpus opulifolius (ninebark), Ribes odoratum (clove currant)
Lonicera x bella Bell's honeysuckle R Amelanchier spp. & cvs. (serviceberry), Calycanthus floridus (Carolina allspice), Diervilla spp. (bush honeysuckle)
Lonicera japonica Japanese honeysuckle R ______
Lonicera maackii Amur honeysuckle R Amelanchier spp. & cvs. (serviceberry), Calycanthus floridus (Carolina allspice), Diervilla spp. (bush honeysuckle)
Lonicera morrowii Morrow's honeysuckle R Amelanchier spp. & cvs. (serviceberry), Calycanthus floridus (Carolina allspice), Diervilla spp. (bush honeysuckle)
Lonicera tatarica Tatarian honeysuckle R Amelanchier spp. & cvs. (serviceberry), Calycanthus floridus (Carolina allspice), Diervilla spp. (bush honeysuckle)
Rhamnus cathartica Common buckthorn R Alnus rugosa (speckled alder), Carpinus caroliniana (American hornbeam), Corylus americana (American filbert), Thuja occidentalis (American arborvitae) and Thuja plicata (giant arborvitae)
Rhamnus frangula Glossy buckthorn R Alnus rugosa (speckled alder), Carpinus caroliniana (American hornbeam), Corylus americana (American filbert), Thuja occidentalis (American arborvitae) and Thuja plicata (giant arborvitae)
Rosa multiflora Japanese rose R Rosa spp. & cvs. (hardy shrub roses)
Spiraea japonica Japanese meadowsweet W Clethra spp. (summersweet), Hydrangea spp. (hydrangea), native Spiraea (spirea)
Syringa reticulata Japanese tree lilac W Clethra spp. (summersweet), Hydrangea spp. (hydrangea)
Viburnum opulus European cranberrybush viburnum R species
E cultivars
Viburnum dentatum cvs. (arrowwood viburnum), Viburnum trilobum (American cranberrybush viburnum)

Chicago Botanic Garden Conservation Science Department Status:

R = Remove as soon as possible, including all cultivars, and/or do not add to collection in future;
P = Phase out (species that pose a lesser invasive risk, form significant structural features in landscape, and will be time-consuming to replace will be phased out over a five- to ten-year period);
E = Evaluate species and cultivars, then remove invasive taxa;
W = Watch list (taxa not posing a serious invasive risk in the Chicago area currently, but may do so in the future).