A word of precaution when picking watercress, avoid picking from any streams, which are close to fields of cattle and sheep. Liver fluke can contaminate watercress, which is common in cattle but more especially sheep. Watercress from these parts can still be picked but needs washing and cooking to kill the bacteria whilst watercress found growing away from herds of cattle or sheep flocks can be eaten raw in perfect safety.
My simple advice would be to never pick and eat any wild watercress.
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