agree with this, each year we clear a field of the ragwort that keeps popping up before we cut it for sheep hay. It had been reducing in amount each year...until now! This year it is back to square 1, very dispiriting! However some other fields have none! (We have a battle with it as there is 40 acres of land which hadnt been cultivated for 30-40 years, and the cattle farmer next door wasnt very good at clearing it on his land. So will take a while to get clear completely)