These dangerously invasive species contain furocoumarins which are harmful to other beings.
Also known as silk tree, this aggressive grower contains neurotoxin that is harmful to dogs.
This is a beautiful flowering plant but takes over an area and killes native species.
This spreads rapidly through rhizomes and takes over native ground cover.
Introduced from Europe spreads rapidly and is considered invasive in some areas outcompeting sugar maple.
Sometimes called ditch Lily, is considered invasive because its tubers spread aggressively.
These rounded bushes have small oval leaves that may be red, green, or burgundy with sharp spines.
Introduced as an ornamental is an invasive species that produces sap that acts as respiratory irritant.
This ground cover has lobed or spade-shaped leaves. It will also climb rapidly up trees or walls
Introduced as an ornamental, grows everywhere and is spread easily by birds who eat the seeds.