Identifying Ontario's dangerous plants

Cow parsnip, wild parsnip and giant hogweed can cause injury to humans ranging from mild rashes to severe blistering, if touched by the juices in their stem.

I set out with invasive species technician Jeff Dickie to learn how to identify these 'poisonous' plants. While taking extreme caution, Dickie shows me the key identification features of each plant.

Header image, featuring giant hogweed: Appaloosa/Wikipedia Creative Commons CC BY-SA 3.0