Yellow Flag

Yellow Flag Iris pseudacorus, which is also known as Flag or more prosaically as Yellow Iris, decorates the borders of ponds, rivers and lakes from May to August throughout the UK, and is only absent from the Scottish Highlands. The name Flag may have originally come about when the iris was used as a symbol on the battle flag of Clovis, a 5th century King of the Franks, although this may be apocryphal. Yellow Flag seems to have had an amazing number uses to man over the centuries. Dye can be obtained from the the flowers and leaves and the roots produce a black dye used in ink called rather ominously Sabbath Black and roasted seeds can be used as a coffee substitute. The rhizomes were used to treat a variety of ailments including coughs, bruising, toothaches and ulcers and the powdered roots were used to be clear head colds. Irises were also hung over doors to ward of evil spirits in the Middle Ages.

The leaves of Yellow Flag provide food for some moth caterpillars including Water Ermine and Belted Beauty, as well as dragonfly larvae and large stands in Western Scotland form an important habitat for Corncrakes.

This photo taken in June last year at College Lake looks slightly like a studio shot, but the dark background which sets off the flower so well is actually shadowy water and vegetation.

Yellow Flag Iris pseudacorus