It MAY be Myosotis sp. Common name Forget me not. Please can you add pics of the flowers to this thread, when they open. http://images.google.co.uk/imgres?i...b:IE-ContextMenu&rlz=1I7SUNA_en-GB&tbs=isch:1
Cornflower. It's invasive and will spread by seeds and rhizomes. You can keep it in one area by not letting it go to seed and by removing the rhizomes around the main plant but it is a high maintenance plant. I put the one that came into my yard out into the alley along the fence, a good spot for this one. http://www.botanicalgarden.ubc.ca/forums/showthread.php?t=26404&highlight=b