Iris sibirica 'Caesar's Brother'

Caesar's Brother Siberian Iris

Iris sibirica ‘Caesar’s Brother’ — commonly called Siberian iris — is a vigorous clump-forming perennial valued for its rich deep violet-purple flowers that bloom in late spring to early summer above tall, narrow blue-green foliage. The elegant flowers are held on sturdy stems and create a bold vertical accent while the fine-textured foliage remains attractive long after flowering.

Type: Perennial

Mature Size:
Width: 24–30 in.
Height: 36–42 in.

USDA Zones: 3a–8b

Form: Upright, clumping

Light: Full sun to partial shade

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

Water: Medium; prefers consistent moisture, especially during active growth

Wildlife: Deer resistant; attracts butterflies

Features & Landscape Uses: Excellent for perennial borders, rain gardens, pond edges, and mass plantings. Its strong purple flowers provide outstanding contrast with lighter spring and early summer perennials.

Care: Water regularly during dry periods, especially in spring and early summer. Divide clumps every 4–5 years in early spring or late summer if flowering declines. Cut back old foliage in late fall or early spring.

Plant type

Perennial

Height

36-42"

Width

24-30"

Hardiness zones

3–9

Sunlight

Full Sun, Partial Shade

Growth rate

Fast

Bloom time

Early Summer, Summer

Flower color

Blue, Violet

Leaf color

Green

Fall color

Green

Attracts

Butterflies

Soil

Average, Highly Adaptable, Tolerant of Clay, Well Drained

Landscape use

Border, Container, Foundation, Mass Planting

Shape

Clumping, Upright

Fragrant

Yes

Deer resistant

Yes

Drought tolerant

No