No matter how many times I have tried to kill them they still thrived.
Admitting defeat I’ve left them as is and went around them with my pebbles and stones.
What can one do ?

Don’t underestimate their pathetic sight . They actually flowered one year and gave me beautiful purple flowers.

As for this bush it’s gotten bigger.
As for me as soon as I accepted the situation my outlook was different.
Moral of the story:
If unhappy make changes. If can’t make changes then learn to accept 😂