Ragwort!
Its flowers are pretty but it contains, as many plants, some toxins that deter grazing.
To animals this can be a problem when consumed in hay, but fresh it tastes too bad to be consumed in quantities large enough to cause harm*.
Perhaps it is time to revisit control methods and common misconceptions…?
*https://ragwortfacts.com/ragwort-control-ecology.html https://friendsoftheearth.uk/nature/ragwort-poisonous-ragwort-mythbuster
