Iris sibirica 'Blue King'
Genus: Iris
Species: sibirica
Variety: 'Blue King'
Plant Type: Herbaceous Perennial
Quickly growing into a bold clump of upright leaves, it bears lots of stems of lovely clear sky blue flowers in late spring and early summer. It thrives in any good soil that's not too dry, and is also happy as a marginal plant in a pond.