Help appreciated please - purple flowers on stone wall

Hi,
I have these creeping purple flowers growing on a few walls in my garden.
They seem to spread easily and grow even in the smallest hole in the stones.

I've done a bit of searching and the only thing I could find that was close was a type of Phlox.

Any ideas?

Thanks,
Paul

 

Hello Paul and welcome to GC.

I believe you have Campanula poscharskyana (Serbian Bellflower) which is a lovely lovely plant.

 

Thanks Victoria. That was really quick and helpful.
I've double checked on Google images and other pictures there look exactly the same.
Much appreciated.

 

The chap who introduced it to Britain. one William Ingwerson, said that it was the one plant he really regretted bringing in. It can be a terrible thug.

 

I think I'd rather have it Palustris than Oenothera speciosa 'Rosea' which I brought from the UK to here as it has taken over and I can't eradicate it as the roots seem to go to Australia. It and the Oxalis pes-caprae, both of which I sent to Pete and they have probably populated Kent by now ... :flag: