Species

Iris irisIris

14 other cultivars

perennial

Supreme Sultan Iris

Iris iris 'Supreme Sultan'

The Story

Plant Bio

Iris 'Supreme Sultan' features striking, tall spikes of deep, vibrant red flowers.

This cultivar is noted for its unusual red hue, which is less common among Iris varieties, making it a standout in any garden.

Uses & Benefits:

Provides stunning, fragrant purple flowers that add elegance to borders and beds.

Low-maintenance perennial that naturalizes over time.

Supports pollinators like bees and butterflies, enhancing garden biodiversity.

SpeciesIris irisIris

Essentials

At a Glance

Plant Type

Perennial

Height

36 inches

Width

24 inches

Light

Full Sun, Partial Sun

Zones

4, 5, 6, 7, 8, 9

Water

Moderate

Humidity

Average

Lifespan

Perennial

Native To

Europe and Asia

Toxicity

Toxic to humans and pets if ingested

Bloom period

Late spring – Early summer

In flower about 2 months of the year

Planting

How to Grow

Tuck rhizomes 2 inches deep into well-draining soil.
Water regularly but avoid waterlogging during establishment.
Fertilize with a balanced fertilizer in early spring.
Divide clumps every 3-4 years in late summer or early fall.
Mulch around plants to retain moisture and suppress weeds.
Remove dead foliage in late fall to prepare for winter.

Pro Tip

Plant in full sun for the best bloom and ensure good drainage to prevent rhizome rot.

Keep It Thriving

Care Guide

Do

Water deeply during dry periods 🌱
Apply fertilizer in early spring
Remove spent blooms to encourage more flowers
Divide clumps every few years

Don't

Avoid waterlogging the roots ❌
Don’t plant in heavy clay soil without amendments ❌
Refrain from over-fertilizing to prevent lush foliage with fewer flowers ❌
Don’t neglect to mulch for winter protection ❌

Seasonal Care Calendar

Task	Jan	Feb	Mar	Apr	May	Jun	Jul	Aug	Sep	Oct	Nov	Dec
Divide
Fertilize
Pest Check
Plant
Prune
Spring Cleanup
Winter Prep

Watch Out For

Pests & Diseases

Common Pests

Common Diseases

In the Garden

Landscape Uses & Companions

Landscape Uses

Elegant flower borderBright focal point in perennial bedsVanilla-scented garden accent

Companion Plants

Daylilies Peonies SalviaLavender Catmint

Multiply

Propagation Methods

Good to Know

Common Questions

Supreme Sultan Iris questions

What zones can Supreme Sultan Iris grow in?

Supreme Sultan 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 Supreme Sultan Iris deer resistant?

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

When does Supreme Sultan Iris bloom?

Supreme Sultan 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 Supreme Sultan Iris need full sun?

Supreme Sultan Iris does best in full sun to part shade. In hot climates, afternoon shade keeps blooms fresher longer.

Is Supreme Sultan Iris drought tolerant?

Yes — once established (usually after the first full season), Supreme Sultan Iris handles dry spells with minimal watering. Water deeply its first year to build the root system that makes that possible.