I have found what I *think* is Common Hogweed in one of my new fields (no horses have been in it yet). Am I correct in thinking this is poisonous to horses and needs removing? Is this different to Hemlock? Some of it has flowered and some is large clumps of leaves low to ground. Haven't got a photo but can get one tomorrow... if it does need removing what is the best way? It is well spread out over quite a large field so fencing it off isn't really an option. Any advice much appreciated!