Add timeless elegance to your garden with Iris sibirica 'Caesar's Brother', an award-winning Siberian Iris prized for its rich royal purple flowers and graceful, grass-like foliage. Blooming in late spring to early summer, this hardy perennial produces stunning deep violet blooms that attract butterflies and other pollinators while bringing bold color to borders, rain gardens, pond edges, and cottage landscapes.

Unlike Bearded Irises, Siberian Iris thrives in consistently moist, well-drained soil and requires very little maintenance once established. Its upright clumping habit, excellent cold hardiness, and long lifespan make it a dependable favorite for gardeners seeking season-long structure and reliable spring blooms.

Fall 2026 Pre-Order — Reserve your healthy live bareroot or potted plant for fall shipping.

Key Features

• Award-winning Siberian Iris
• Rich royal purple blooms
• Elegant grass-like foliage
• Excellent for rain gardens and pond edges
• Attracts butterflies and pollinators
• Deer resistant
• Cold hardy perennial
• Long-lived clumping habit
• Excellent cut flower
• Easy-care landscape perennial

Plant Details

Botanical Name: Iris sibirica 'Caesar's Brother'

Common Name: Siberian Iris

Plant Type: Herbaceous Perennial

Flower Color: Deep Royal Purple

Foliage: Narrow, Upright Green Leaves

Bloom Season: Late Spring to Early Summer

Mature Height: 30–36 Inches

Spread: 18–24 Inches

Growth Habit: Upright Clumping

Light Requirements: Full Sun to Partial Shade

Water Needs: Moderate to High

Soil Requirements: Moist, Well-Drained Soil

Hardiness Zones: USDA 3–9

Characteristics: Deer Resistant, Pollinator Friendly, Moisture Loving, Easy Care, Long Lived

Garden Uses

Perfect for:

• Cottage gardens
• Rain gardens
• Pond edges
• Water features
• Mixed perennial borders
• Meadow gardens
• Pollinator gardens
• Woodland edges
• Naturalized landscapes
• Cut flower gardens
• Moist garden beds

Planting Partners

Pairs beautifully with:

• Astilbe
• Lobelia cardinalis
• Filipendula
• Aquilegia (Columbine)
• Veronicastrum
• Hosta
• Ferns
• Ligularia
• Rodgersia
• Carex (Sedge)

Care Tips

• Plant in full sun for the best flowering.
• Prefers consistently moist, fertile, well-drained soil.
• Water regularly during establishment.
• Remove spent flower stalks after blooming.
• Divide every 3–4 years in early fall to maintain vigor.
• Mulch to conserve moisture and reduce weeds.
• Performs well near ponds, streams, and rain gardens.