Posted: 06/08/2014 at 23:11
I have a similar problem at my new allotment. I put down weed control fabric where my brassicas are and it lifted it up 15"!!
After lots of research on professional landscape/horticulture forums the general consensus for eradication is a product called Kurtail,, but at £30+ a pop it bloody should be!!
There are a few videos on youtube showing the results and I will be clearing my plot early this year to let the offender run wild before applying.
So watch this place for the results and I may even post some pictures of before and after.