On Wed, 26 Sep 2007 08:30:05 -0700, Denny wrote:

Hi, this past spring I saw this plant growing right against the fence
between my neighbour's yard and mine. I was going to cut it down, but
I was curious as to what it is. It is just now starting to flower, and
the blooms sure are pretty. Can anyone ID this plant? Area is southern
Ontario Canada, Thank you very much in advance.

Denny

http://home.ca.inter.net/~deniswb/nice_flower.jpg

It's most likely a hibiscus or a close relative - in other words a plant
classified in the family Malvaceae. I can't see the sexual parts clearly enough
to tell if it is a hibiscus or something else. If you Google Images for hibiscus
you can see what the sexual parts look like and compare to your plant.