Blue/purple Plant In Garden

[diamond1409]

i have a blue/purple plant that is spreading in my garden, the flowers are bell shaped and the plant grows about 12/18 inches tall, this plant dies in autumn but grows back again in the spring, could it be borage?

[Prudie]

Borage flowers are open not bell shaped though. Bluebells is obviously too obvious?

[gen2]

Possibly Campanula

[boxtops]

harebells? http://www.google.co.uk/search?q=harebell&tbm=isch&tbo=u&source=univ&;sa=X&ei=tAGrUaWVKoWi0QX_34HoDg&sqi=2&;ved=0CDgQsAQ&biw=1045&bih=692

[Robinia]

If it's none of the above can you describe the leaves please? Oval, long, hairy, smooth? And how big are the flowers?

[hammerman]

Cerinthe ?