Posted: 09/02/2017 at 00:37
Digging is by far the best solution. There will be weak growth from the roots left behind. Easy to deal with.
Nettles are very satisfactory to pull up. They like really fertile soil so they may be on an old muck-heap. Suitable weedkiller will deal with re-growth or what you fail to remove.
Exclude the horses from any weed-killer areas.