Posted: 20/07/2013 at 10:02
Cut all the flowers off and remove.
Get a knapsack sprayer fill with glyphosate/Roundup and spend an evening or two walking over every inch of your meadow spraying every individual hogweed plant - then leave well alone. They'll be well and truly dead by the time you mow the meadow in September.
You might have to do this every year for the next few years but it'll be worth it and it's the only way to do it. If I did this over three grazing meadows a few years ago and it worked.
I was also digging out ragwort at the same time
We had orchids, fritillaries and other precious things growing there - they weren't harmed.