Whenever we get things growing like that it is either Carex pendula which is a terrible seed thug or it is Iris foetidissima which is also a seed thug.

Okay, thanks folks I’ll get rid of it.

Yes! Dig it up quickly.

I have one and the seeds pop up all over the place Grrrr! I have a large one in the front garden but its too big to dig up ;o( so has anyone any ideas how I can kill it? x