Posted: 07/06/2012 at 09:48
Your first two pictures look as if the plant is a violet. Your third plant has me foxed, I am afraid. Are you sure this is the same plant?
Violets spread easily. I have been battling with them the last two years, and am now getting close to having got rid of them. You just need to put some hard work into continually taking them out before they smother everything.