Another real shocker that everyone should learn to identify is Hemlock Water Dropwort (Oenanthe crocata). This wild member of the carrot family is potentially deadly to both humans and livestock. It is abundant on Islay where it grows in ditches and in all sorts of shallow wet places. It is quite easy to identify however, and the roots are the really deadly parts, although the whole plant is very toxic. Occasionally, cattle have been known to succumb when they have eaten roots that have become exposed by ditch clearance.
So, the message is to be careful, and gradually build your experience and confidence levels when identifying plants.
Lots more excellent information from Mark Williams at Galloway Wild Foods
Useful guidance from the Royal Horticultural Society overall, their advice is: “Serious poisoning by plants is very uncommon in the UK. Some garden plants present a hazard, but the risk of severe poisoning, skin reaction or allergy is generally low.” (The Royal Horticultural Society)