Campanula growing in thin air

I also have few of them growing in the cracks of pavement :-)

Looks happy there !

I have some that grows in my porch each spring, in fact it is in flower right now.

I have some growing along the base of one outside wall .... Help it's taking over :o))

Amy......Tesco are selling it in a pot for £3 !!

The mother plant crept in from next door under the concrete. They seem to grow anywhere odd.