I was lucky enough to have this lovely scented flower volunteer in my garden. Who knows where it came from as there is no other plant in my area I have seen. Faithful, spreads slowly for me allowing me to share with fellow gardeners, scented with double pink flowers. What is not to like.
I love the soapwort that I have. I had been told when I planted it several years ago it may be invasive. I've never had any problem with that and wish it would spread more. It has just started to bloom here and it's one of my most favorite plants in my garden.
I have not found this particularly invasive in Ontario. I do however regret ever planting wild purple violets. I may never get rid of all of them. I don't mind when they invade the lawn but they insist on trying to oust my precious garden plants.