Yeah, the plot is infested with the bloody stuff... never found anything that can kill it.
At this point pulling it early to weaken it seems the only viable control.. 😡
Discussion
Yeah it's not an easy one to get rid of ammonium sulphamate would kill it but it will kill everything else too. Seems to like wet ground most though I wonder if you improved the water holding capacity with biochar it might go away? No guarantee though!
Rich in silica though so it makes a good spray for plant health.
It gets added rotted down for that purpose, currently experimenting with biochar. Going to work on one bed at a time. I'll post results and we'll see if there's a difference 😉