A close up picture of flower would help. Shot in the dark however, Impatiens sp ?

Thanks for your shot in the dark, but doubt it is an impatient. It is growing in full sun.

I also crushed a leaf, maybe for another clue. But just smells like a plant.

Thank you for identifying it Jay. Now I have got to figure out whether to keep it or kill it!

You're welcome Villain Rose.

Villain Rose...if you cook curries, I'd encourage you to keep it. A very common (even weedy) plant in India, the leaves are fried along with black mustard seeds, cumin seeds, curry leaves and fenugreek before adding the onions/garlic/ginger/chillies. I wouldn't be without it.

Also used in Ayurvedic medicine. (Although that may not interest you!)

Thank you Shaxhome for your advice about this plant, as I have never seen it before.

I have decided to keep it, but move it to somewhere else in the garden. I don't think I would cook with it though, but handy to know that it is edible. Thank you.

Well, VR, it is a real weed in India, growing along roadsides, in ditches and in crop fields. You being in a not dissimilar climate up there in Qld, I'd be wary and keep an eye on it for spreading...

Thank you Shaxhome.

I did move this plant yesterday. I will keep my eye on it, and pull it out if it spreads too much.

I'm not really sure if I like it in my garden anyway.