My pony had laminitis so horses are held in the paddock where is almost no grass. There are buttercups too, but they leave them alone.
My mare isn't laminitis prone and she gets some extra grass. Grass that I cut(mow) from neighbour's field and bring it to the paddock-to her. I thought she will leave buttercups as she does in the paddock, but she ate everything!
I still want to give her grass, because it helps with her weight, and I picked all the buttercups out of the grass I mowed today, but it took me forever.