Species

Iris sibiricaSiberian Iris

26 other cultivars

perennial

Siberian Iris 'Blue Sapphire'

Iris sibirica 'Blue Sapphire'

The Story

Plant Bio

Iris siberica 'Blue Sapphire' is a hardy perennial that features stunning blue flowers and is known for its vigorous growth and adaptability to wet conditions.

This cultivar produces intense blue flowers with a distinctive yellow signal on the falls, making it particularly eye-catching in borders and water garden settings.

Uses & Benefits:

Vibrant blue blooms add striking color early in the season, ideal for borders and rock gardens.

Low-maintenance perennial that requires minimal care once established.

Provides early nectar for pollinators such as bees and butterflies.

SpeciesIris sibiricaSiberian Iris

Essentials

At a Glance

Plant Type

Perennial

Height

32"

Width

24"

Light

Full Sun, Partial Sun

Zones

4, 5, 6, 7, 8

Water

Moderate to high

Humidity

Average

Lifespan

Long-lived perennial

Native To

Hybrid origin (species from Europe/Asia)

Toxicity

Slightly toxic if ingested, can cause skin irritation

Bloom period

Late spring – Early summer

In flower about 2 months of the year

Planting

How to Grow

Tuck rhizomes into well-draining soil in early spring.
Water thoroughly after planting to settle soil.
Mist foliage during dry spells to maintain humidity.
Divide clumps every 3-4 years in late summer for rejuvenation.
Mulch lightly to conserve moisture and suppress weeds.
Remove spent flowers to encourage reblooming.

Pro Tip

Plant rhizomes just below soil surface for optimal flowering and stability.

Keep It Thriving

Care Guide

Do

Provide full sun for vibrant blooms 🌞
Ensure well-draining soil to prevent root rot 🌱
Water regularly during active growth periods

Don't

Avoid overly wet soil in winter ❌
Don't plant too deep; keep rhizomes near the surface ❌
Refrain from fertilizing late in the season

Seasonal Care Calendar

Task	Jan	Feb	Mar	Apr	May	Jun	Jul	Aug	Sep	Oct	Nov	Dec
Deadhead
Divide
Fertilize
Plant
Spring Cleanup

Watch Out For

Pests & Diseases

Common Pests

Common Diseases

In the Garden

Landscape Uses & Companions

Landscape Uses

Perennial border with vibrant blue flowersRock garden accent with silvery foliageWildflower meadow for early spring color

Companion Plants

AlliumDaylilies Lavender SedumPeonies

Multiply

Propagation Methods

Good to Know

Common Questions

Siberian Iris 'Blue Sapphire' questions

What zones can Siberian Iris 'Blue Sapphire' grow in?

Siberian Iris 'Blue Sapphire' is hardy in USDA Zones 4–8. Inside that range it survives winter in the ground; outside it, grow it as an annual or a container plant you protect.

Is Siberian Iris 'Blue Sapphire' deer resistant?

Yes — Siberian Iris 'Blue Sapphire' is rated deer-resistant. Deer typically pass it over, though extreme hunger can override any plant's defenses.

When does Siberian Iris 'Blue Sapphire' bloom?

Siberian Iris 'Blue Sapphire' typically blooms in late spring through early summer. Exact timing shifts a week or two with your zone — Sow's bloom calendar maps it to your garden.

Does Siberian Iris 'Blue Sapphire' need full sun?

Siberian Iris 'Blue Sapphire' does best in full sun to part shade. In hot climates, afternoon shade keeps blooms fresher longer.