Wild morning glories

[QuietOne]

Invasive, but still pretty.

[Mad Aussie]

We get a very similar plant here but it's more blue than pink.

[QuietOne]

They come in a variety of colors, and there are a number of subspecies. They grow just about everywhere. I've run across references to blue ones in Australia, so it may be that what you're thinking of are also morning glories.