Species

Iris sibiricaSiberian Iris

26 other cultivars

perennial

On Mulberry Street Siberian Iris

Iris sibirica 'On Mulberry Street'

The Story

Plant Bio

Iris siberica 'On Mulberry Street' is a perennial iris known for its tall, slender foliage and intricate blue flowers.

This cultivar stands out due to its vibrant blue color and blooming earlier in the season compared to other Siberian irises.

Uses & Benefits:

Iris siberica On Mulberry Street offers stunning blue blooms in late spring, enhancing garden borders and rock gardens.

Provides natural ground cover and prevents soil erosion in garden beds.

Supports pollinators like bees and butterflies, contributing to local biodiversity.

SpeciesIris sibiricaSiberian Iris

Essentials

At a Glance

Plant Type

Perennial

Height

34 inches

Width

24 inches

Light

Full Sun, Partial Sun

Zones

4, 5, 6, 7, 8

Water

Moderate

Humidity

Average

Lifespan

10+ years

Native To

Siberia

Toxicity

Toxic to pets if ingested

Bloom period

Late spring – Early summer

In flower about 2 months of the year

Planting

How to Grow

Tuck seeds into moist, well-drained soil in early fall for natural stratification.
Mist cuttings regularly to maintain humidity and promote root development.
Plant rhizomes in spring, spacing them 12 inches apart for optimal growth.
Water deeply after planting and keep soil consistently moist during active growth.
Fertilize with a balanced fertilizer in early spring to encourage blooming.
Mulch around plants to retain soil moisture and suppress weeds.

Pro Tip

Use well-draining soil and avoid overwatering to prevent root rot.

Keep It Thriving

Care Guide

Do

Water regularly during dry spells 💧
Deadhead spent blooms to encourage reblooming 🌸
Divide clumps every 3-4 years to maintain vigor
Apply a balanced fertilizer in early spring
Mulch to retain soil moisture

Don't

Avoid overwatering, which can cause root rot ❌
Do not plant in heavy, waterlogged soil
Refrain from removing all foliage at once in fall
Avoid fertilizing late in the season
Never ignore signs of pests or diseases

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

Sherbet-colored borderPerennial garden accentRock garden focal point

Companion Plants

Daylilies Peonies SalviaAlliums Sedum

Multiply

Propagation Methods

Good to Know

Common Questions

On Mulberry Street Siberian Iris questions

What zones can On Mulberry Street Siberian Iris grow in?

On Mulberry Street Siberian Iris 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 On Mulberry Street Siberian Iris deer resistant?

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

When does On Mulberry Street Siberian Iris bloom?

On Mulberry Street Siberian Iris 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 On Mulberry Street Siberian Iris need full sun?

On Mulberry Street Siberian Iris does best in full sun to part shade. In hot climates, afternoon shade keeps blooms fresher longer.