Yellow iris Iris pseudacorus

Best Time to See
Habitat Woodland

Also known as 'yellow flag'.

A tall plant (it can grow up to a meter and a half in height) with branched stems and large, bright yellow flowers. Its leaves are long and sword-shaped.

The yellow iris was chosen as the County Flower of Wigtownshire and the county's marshy hollows are often flooded with its bright 'flags' . It is known locally as 'segg' or 'sword-grass', a reference to the equally remarkable blade-like leaves.


Widespread throughout the UK, except for the Scottish Highlands.


A plant of damp places, from lake and river margins to wet woodland and marshes.

Best time to see

When it flowers from May to July.

Did you know?

The yellow iris is thought by some to be the original 'fleur-de-lis' - a common symbol of heraldry.