Morning glory is officially classified as a weed here. You can't buy it, and I suspect that if they catch you planting it around here, then you'll get slapped with a fine.

It loves the Sydney environment and it grows rampant, and once it's in, you won't get it out. It's a zombie plant. I have a local friend who has to go around and yank out all the tendrils of morning glory growing through her deck regularly through spring and summer.