Hi Rogi.
I'm adding this question to GoYpedia Campanulas, as it may be useful to other members in the future :o)

I can't say for sure, but will tell you that, whenever I've had one from, say, a supermarket or garden centre (not sold from outside, but under shelter or inside) they've never made it through a winter outside.

Same here Bamboo. I thought it was just me. I've had them die off during the summer too. That's the Cornish summer for you. :-( I didn't know there were indoor Campanulas - that might explain a lot.

Rogi, yours looks like Campanula portenschlagiana. Last Summer I've saved one from the supermarket and planted outside. It felt well. :) Don't know how it is now, but this variety is hardy (Z 4-8). Looking forward to the Spring to see it's OK (I'm sure! :)) Good luck with it!

Hallo all. Thanks for the answers. Uma wrote "this variety is hardy (Z4-8)"...now on the plant label it has also got a number PLU 826 but searching in google didn´t help me so maybe the number in this case is just from the supermarket or wherever it came fom inthe first place. Never mind I will keep it indoors until the warmer weather comes...or until my green house it put up and see what happens.

There are some tender varieties of Campanula, and I suspect this is one of them, meant to be used as a temporary houseplant. I'd still plant it outside in late spring anyway, rather than bin it, you never know your luck...