Eating invasive species has been suggested by people such as ecologist Joe Roman as a way of reducing their numbers. This is a list of cases where this has been suggested, tried and/or is now established.
Plants
Autumn olive (Elaeagnus umbellata), invasive to central and northeastern United States, and Europe.
Jackfruit (Artocarpus heterophyllus), invasive to Brazil.
Water hyacinth (Eichhornia crassipes), introduced in North America, Europe, Asia, Australia, Africa, and New Zealand; invasive in many of these areas.
Garlic mustard (Alliaria petiolata), invasive in North America
Palmer's amaranth (Amaranthus palmeri)
Kudzu (Pueraria spp.)
Armenian blackberry (Rubus armeniacus)
Dandelion (Taraxacum spp.)
Water caltrop (Trapa spp.)
Burdock (Arctium spp.) - was introduced to Europe, leaves, flowers and roots are edible
Japanese knotweed (Reynoutria japonica spp.) - was introduced to the United States from East Asia, shoots are edible and the roots are used for medicinal purposes
Wintercress (Barbarea vulgaris spp.) - invasive, leaves are edible