Iris Sibirica 'Butter And Sugar'

Siberian Iris

Iris sibirica ‘Butter and Sugar’ — commonly called Siberian iris — is a classic clump-forming perennial known for its elegant bicolor flowers, with creamy white upright petals and soft buttery-yellow falls that bloom in late spring to early summer. Slender blue-green foliage forms a graceful upright clump that remains attractive through the season, adding vertical texture to borders and moist garden areas.

Type: Perennial

Mature Size:
Width: 18–24 in.
Height: 28–32 in.

USDA Zones: 3a–8b

Form: Upright, clumping

Light: Full sun to partial shade

Soil: Average to moist, well-drained soil; adaptable to loam and clay

Water: Medium; prefers evenly moist soil, especially during bloom

Wildlife: Deer resistant; attracts butterflies

Features & Landscape Uses: Excellent for perennial borders, rain gardens, pond margins, and naturalized plantings. Its soft yellow-and-white flowers pair well with blue, purple, and pastel spring companions.

Care: Water regularly during dry periods, especially in spring. Divide clumps every 4–5 years in early spring or late summer to maintain vigor. Remove old foliage in late fall or early spring.

Plant type

Perennial

Height

24"-30"

Width

18-24''

Hardiness zones

3–8

Sunlight

Full Sun, Partial Shade

Growth rate

Fast

Bloom time

Early Summer, Summer

Flower color

White

Leaf color

Green

Fall color

Dark Green, Green

Attracts

Butterflies

Soil

Clay, Highly Adaptable, Moist well-drained

Landscape use

Foundation

Shape

Clumping, Upright

Fragrant

Yes

Deer resistant

Yes

Drought tolerant

No