Invasive species reduce the biodiversity and available habitat for wildlife in the area. Invasive plants outgrow natives and take away nutrition and light. Many are garden escapes.
Some plants are listed as provincial noxious and it is mandatory they be controlled. Along the Miami River Greenway we control:

Japanese Knotweed

Himalayan Balsam

Tansy Ragwort

Scentless Chamomile

Yellow Iris

Giant Hogweed

Other plants are considered to be nuisance plants. Along the Miami we deal with:

Himalayan Blackberry

Bindweed

Periwinkle

Lamium (silver nettle plant)

Scotch Broom (regionally noxious in Okanagan)

Reed Canary Grass

English Ivy

English Holly