https://pfaf.org/USER/Plant.aspx?LatinName=Iris+germanica
Iris germanica is a PERENNIAL growing to 1 m (3ft 3in) by 1.5 m (5ft) at a medium rate. See above for USDA hardiness. It is hardy to UK zone 5 and is not frost...
iris germanicapurple flagorris roottall bearded