This is actually introduction from South America. In Guernsey it persists on a main street growing near a public toilet and in the gutters! It is widely naturalised on the European mainland but is relatively uncommon in Britain.

St. Sampsons Main Street, Guernsey 18th June 2004

Added on 31st October 2004, updated 28th June 2008, updated Feb 26th 2010, updated Se3 23rd April 2010, updated 7th August 2018