Another plant ID please.

[beyond the blue]

Can anyone put a name to this plant please (hopefully not a weed)

2-3 feet tall
Comes up each year
Spreads like mad
White flowers ( June)
Very shallow roots
Individual stems with own roots

 

[Tigger.ufo]

Campanula? (Bell flower)

 

[beyond the blue]

Campanula? (Bell flower)

Nice one Heather! Thank you.

 

[viv1969]

Btw....any plant is only a weed if you don't want it there.