OMG!!
I found out about cow parsley only last year, after having had a horse for over 8 years... friends were giving it to their horses as a snack at one particular stables, where they picked it from the same spot.
I took some from the same spot yesterday to see if CW liked it and he LOVED it, so I picked some more from a different spot today and gave it to him in his pm hay.
I was going to start a thread about cow parsley, but then found this one.. and it has made me seriously seriously worried. I have looked on many websites and have found that hemlock and cow parsley look very similar to the point that I am finding it difficult to see the difference from piccies

Then I saw this post... is this right??? would hemlock typically come out a little later???? PLEASE someone tell me that I haven't inadvertently given him hemlock!
Usually Cow Parlsey is out before Hemlock appears.
It seemed that hemlock comes out in summer but the weather has been very very dry....
Wally wrote a note on another cow parsley post about a year ago, that horses don't find hemlock as palliative but CW thrust himself into eating it with gusto. Does this mean it's cow parsley???
How could I have been so stupid and not investigated beforehand. Should have realised that the other ladies were taking their cow parsley from the same spot...

stupid stupid