This introduction from Asia or North America grows at the edges of slow moving or still water. It is a shy flowerer so you can often find only the leaves which are light green with one edge wrinkled. The reason it is Sweet-flag is that the leaves look a little like those of the Yellow flag but not much. When crushed they smell sickly sweet.

It is found throughout England and in east Wales but is less common in Scotland and uncommon in Ireland.

Edge of canal St Helens, 18th July 2005

Added on 20th Jul 05, updated 3rd Oct 06, updated 26th May 08, updated 20th Feb 10, updated Se3 23rd Apr 10, updated 26th Feb 12, Upadted 13 Mar 13