There are quite a few varieties of wild asters in Ontario and, truth be told I'm not sure which one this is. Next time I take photos I MUST take good photos of the leaves and stems as well as the blossoms.
Jewelweed or touch-me-not (Impatiens capensis)
Great Blue Lobelia (Lobelia siphilitica)
This plant likes moist soil and some shade. I've tried to grow this showy wildflower in my gardens but alas my soil is too dry.
I am linking to Wildflower Wednesday HERE
and because S is for SEPTEMBER
I am linking to Jenny Matlock at Alphabe-Thursday HERE