|Botanical Name||Iris psendacorus|
|Origin||Europe, West Asia and Canada|
DescriptionYellow flag is an evergreen semi-aquatic Iris. It produces conspicuous yellow fowers during August.
Where is it found?Favours the margins of lakes, ponds, rivers and drains.
Why is it a problem?Infestations can trap silt, encouraging flooding. Yellow flag also has the potential to adversely affect estuarine and salt marsh vegetation. Dense stands hamper fishing and hinders access to water bodies. Yellow flag is toxic to livestock which generally avoid grazing the plant.
How does it spread?Yellow flag is spead by seed or fragmentation of the root rhizomes.
How do I get rid of it?
Small infestations can be removed by hand taking care to remove all the rhizome.
300 ml Glyphosate/10 L water plus 20 ml Oganosilicone penetrant. Follow up control will be required.
This plant is prohibited from propagation, sale and distribution within New Zealand!