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Key characteristics

Family: Iridaceae
Height: 2 to 3 feet
Width: 1 to 3 feet
Flower color: Cobalt and pale blue
Foliage color: Dark green, slender, sword-like leaves
Bloom time: Late spring to early summer
Light: Full sun to partial shade
Water: Moist to wet soil; tolerates standing water
Maintenance: Low; remove faded flowers to encourage continuous blooming
Growing zone: USDA zones 3 to 9
Wildlife: Attracts butterflies and hummingbirds

Perennials

Iris sibirica 'Bennerup Blue'

Bennerup Blue Siberian Iris

Iris sibirica 'Bennerup Blue' is a cultivar known for its soft blue flowers that bloom from late spring to early summer. The delicate, ruffled petals create a charming contrast against its narrow, upright foliage, which remains attractive even after the flowering period. This Siberian iris thrives in well-drained, moist soils and makes an excellent choice for perennial borders, water gardens, and naturalized areas.

Bred for its resilience and graceful appearance, 'Bennerup Blue' tolerates both wet and dry conditions once established.

Light

Full sun to partial shade

Water

Moist to wet soil; tolerates standing water

Bloom time

Late spring to early summer

Find this plant

Works well in

Borders
Cottage Gardens
Pollinator Gardens
Hummingbird Gardens
Rain Gardens

Companion plants

Bergenias · Sedums · Columbines · Lungworts · Daylilies · Japanese anemones

Design tip

Summer flowers carry the middle of the season, so place it where the bed needs color once spring bulbs fade. Because it is easy about light, use it to carry a planting from a sunny end of the bed into the shadier side.

Printable plant sheet (PDF)