perennial

Navy Blue Crested Iris

Iris cristata 'Navy Blue'

Not currently listed at our partner nurseries.

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Essentials

At a Glance

Plant Type

Perennial

Height

6 inches

Width

12 inches

Light

Full Sun, Partial Sun, Shade

Zones

4, 5, 6, 7, 8, 9

Water

Medium

Humidity

Average

Lifespan

Many years with proper division

Native To

North America

Toxicity

All parts may cause discomfort if ingested.

The Story

Plant Bio

Dwarf Crested Iris is a low-growing, rhizomatous perennial native to eastern North America. It forms a dense groundcover of sword-shaped, green leaves and produces pale blue, lilac, or lavender flowers in spring, each featuring a distinctive yellow or white crest. This cultivar is distinguished by its intense navy blue flowers, which provide a dramatic contrast to its lush green foliage and are highly attractive to pollinators.

Bloom Period:

EarlyLate

Uses & Benefits:

Adds striking blue accents to garden beds and rock gardens, providing early spring color.

Low-maintenance perennial suitable for shaded or partially shaded areas.

Provides early nectar for pollinators emerging in spring.

Marketplace

Where to Buy

We couldn't find this plant listed online right now.

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Planting

How to Grow

Tuck rhizomes 1 inch deep in well-draining soil
Water regularly until established, about 2 weeks
Place in partial to full sun for best blooms
Mulch lightly to retain moisture and suppress weeds
Divide every 3-4 years in early spring for rejuvenation
Avoid overwatering to prevent root rot

Pro Tip

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

Keep It Thriving

Care Guide

Do

Water during dry spells 🌱
Divide in early spring to maintain vigor
Apply balanced fertilizer in spring
Mulch to conserve moisture

Don't

Don't overwater or let sit in water ❌
Avoid heavy fertilization late in the season
Don't disturb roots excessively

Seasonal Care Calendar

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

Watch Out For

Pests & Diseases

Common Pests

Common Diseases

In the Garden

Landscape Uses & Companions

Landscape Uses

Grass-like borderRock garden accent

Companion Plants

Daffodils Sedum Daylilies Hostas

Multiply

Propagation Methods

Good to Know

Common Questions

Navy Blue Crested Iris questions

What zones can Navy Blue Crested Iris grow in?

Navy Blue Crested Iris is hardy in USDA Zones 4–9. Inside that range it survives winter in the ground; outside it, grow it as an annual or a container plant you protect.

Is Navy Blue Crested Iris deer resistant?

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

When does Navy Blue Crested Iris bloom?

Navy Blue Crested Iris 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 Navy Blue Crested Iris need full sun?

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