I found a patch of Giant Hogweed.
I thought it was cow parsnip, until I realized how big it was getting.
It is another plant to add to the list of hazards to be aware of. It is in Northern Ontario now too.
The sap makes your skin burn when exposed to the sun or other UV light sources. Apparently it can cause such deep blisters that they leave holes. It can also cause permanent dark colored scars.
http://www.kingcounty.gov/environment/an...nt-hogweed.aspx

This makes me wonder what you guys would list as the ten most dangerous plants.