Giant Hogweed has white flowers with distinctive purple splotches on the stem. If you think you’ve found Giant Hogweed, do not attempt to remove or touch it. Depending on which section of the trailway you are on, either contact the GRCA or CVC to let them know . You can alway email us at email@example.com for assistance.
Here is a LINK to Ontario Goverment resource on Giant Hogweed.
It can also be mistaken for similar looking plants