A group of girl guides in the UK accidentally planted flowers 'deadly enough to kill humans' in a national park.

The well meaning youngsters were participating in the Countryfile 'Grow Wild Scheme' which aims to turn 'unloved spaces into wildlife-friendly wild flower havens.'

The toxic plants were laid down by the group in Jubilee Park, Royal Wootton Bassett, and were only noticed when a curious photographer snapped a picture of them.

SWNS

"I had absolutely no idea what they were at first. I just saw them there and they looked a bit different," photographer Mike McKee told the Metro.

"I looked in my flower book and it said these were scant and very rare, so I did a bit more research on them. When I Googled them I found out they could be deadly."

Despite the seeds of the flower apparently being toxic enough to kill a human, there have been no casualties reported since the planting of the flowers.

As well as death, symptoms of the toxic flower also include stomach pain, vomiting, diarrhoea, dizziness, weakness and slow breathing.