campanular aaaaarrrrrr

a few years ago we bought a lovely little campanular with bonny purple flowers , it is a ground hugging plant with dark green round leaves
how do I kill the little b........ as it is taking over my lawn or do I kill the lawn and leave the campanular
at least I will not need a mower then
Ive tried various lawn safe weed killers but no luck
any ideas

 

Did you apply the weed killer more than once?

 

Sounds like my rogue plant Ajuga snoo! ..I apply 'Feed and Weed' every month during Summer and after two years I have almost got rid of the swine..In fact I gave the lawn a dessing this afternoon because I spotted a couple of patches!

 

Try old fashioned lawn sand. apply in the autumn and it rests on all braod leaves and should kill them.