Species

Iris sibiricaSiberian Iris

20 other cultivars

perennial

Siberian Iris Blue King

Iris sibirica 'Blue King'

Same species

Species

Iris sibiricaSiberian Iris

20 other cultivars

Essentials

At a Glance

Plant Type

Perennial

Height

24 inches

Width

12 inches

Light

Full Sun

Zones

4, 5, 6, 7, 8

Water

Moderate

Humidity

Average

Lifespan

Perennial

Native To

Siberia and East Asia

Toxicity

Non-toxic

The Story

Plant Bio

Iris sibirica 'Blue King' is a clump-forming perennial with slender, arching leaves and tall flower stems bearing striking, deep blue, iris-like flowers with delicate falls and standards. This cultivar is renowned for its vivid blue blooms and vigorous growth habit, making it a standout addition to perennial borders and wildlife gardens.

Bloom Period:

EarlyLate

Uses & Benefits:

The Siberian Iris Blue King provides vibrant spring color and attracts pollinators, enhancing garden beauty.

Its drought tolerance makes it suitable for low-water landscapes and easy maintenance.

Supports pollinator activity and provides habitat for beneficial insects.

Planting

How to Grow

Tuck rhizomes 2 inches deep in well-drained soil.
Water regularly during first growing season.
Plant in full sun for best blooms.
Fertilize with a balanced fertilizer in early spring.
Mulch to retain moisture and suppress weeds.
Divide every 3-4 years in early spring or late summer.

Pro Tip

Ensure good drainage to prevent rhizome rot and promote healthy growth.

Keep It Thriving

Care Guide

Do

Water during dry spells 🌱
Remove dead foliage in early spring
Divide every 3-4 years to maintain vigor
Plant in full sun for optimal flowering

Don't

Overwater to avoid root rot ❌
Plant in heavy clay soil without amendment ❌
Neglect dividing which can cause overcrowding
Use fertilizer late in the season ❌

Seasonal Care Calendar

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

Watch Out For

Pests & Diseases

Common Pests

Common Diseases

In the Garden

Landscape Uses & Companions

Landscape Uses

Silver-foliaged borderBlue-flowered perennial accent

Companion Plants

Daylilies Hostas Peony Sedum Echinacea

Multiply

Propagation Methods

Good to Know

Common Questions

Siberian Iris Blue King questions

What zones can Siberian Iris Blue King grow in?

Siberian Iris Blue King 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 King deer resistant?

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

When does Siberian Iris Blue King bloom?

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

Does Siberian Iris Blue King need full sun?

Siberian Iris Blue King does best in full sun (6+ hours).