Posted: 21/06/2016 at 22:41
You can rescue them and plant them in pots and then pull out every bit of mare's tail that comes up over the next few months. Probably safest to leave them an entire year and maybe wash the root balls in autumn - when the plants are dormant - to remove any last bits of mare's tail before putting them back in pots.
Meanwhile, you can do a few treatments with Kurtail on the infested bed, fork it over when it's done its stuff and repeat as necessary. It may take a year or two........
I'm doing a similar process with bindweed in another bed - lifting plants into quarantine while I sort out the nasties.