Species

Iris x germanicaGerman Iris

129 other cultivars

perennial

Blackwater German Iris

Iris x germanica 'Blackwater'

The Story

Plant Bio

Tall bearded iris with striking dark purple to black flowers.

Unique coloration, compact growth habit, and excellent for cut flower arrangements.

Uses & Benefits:

Provides striking dark flowers and adds contrast to garden beds.

Low-maintenance perennial with minimal care needs.

Supports pollinators like bees and butterflies.

SpeciesIris x germanicaGerman Iris

Essentials

At a Glance

Plant Type

Perennial

Height

36"

Width

24"

Light

Full Sun, Partial Sun

Zones

5, 6, 7, 8

Water

Moderate

Humidity

Average

Lifespan

Many years with proper division

Native To

Europe

Toxicity

Non-toxic

Bloom period

Late spring – Early summer

In flower about 2 months of the year

Planting

How to Grow

Tuck rhizomes 2 inches deep in well-draining soil.
Plant in full sun for best blooms.
Water regularly during growth season but avoid waterlogging.
Fertilize with balanced fertilizer in early spring.
Mulch to retain moisture and control weeds.
Divide clumps every 3-4 years in late summer.

Pro Tip

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

Keep It Thriving

Care Guide

Do

Water during dry spells 🌱
Remove faded flowers to encourage rebloom ❌
Apply fertilizer early spring 🌱
Divide every 3-4 years 🌱

Don't

Avoid overwatering to prevent rot ❌
Don’t plant in heavy clay soil without amendments ❌
Refrain from neglecting deadheading 🌱
Don’t expose to excessive shade ❌

Seasonal Care Calendar

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

Watch Out For

Pests & Diseases

Common Pests

Common Diseases

In the Garden

Landscape Uses & Companions

Landscape Uses

Fragrant border with dark foliageElegant perennial in flower bedsContrast plant for bright-colored perennials

Companion Plants

Hemerocallis Hosta Salvia Allium

Multiply

Propagation Methods

Good to Know

Common Questions

Blackwater German Iris questions

What zones can Blackwater German Iris grow in?

Blackwater German Iris is hardy in USDA Zones 5–8: in that range it survives winter in the ground. Colder than Zone 5, grow it in a container you can move to shelter for the winter, or as an annual. Warmer than Zone 8, winter isn't the problem: it prefers colder winters, and summer heat can shorten its life.

Is Blackwater German Iris deer resistant?

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

When does Blackwater German Iris bloom?

Blackwater German Iris typically blooms from late spring to early summer. Exact timing shifts a week or two with your zone — Sow's bloom calendar maps it to your garden.

Does Blackwater German Iris need full sun?

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

Is Blackwater German Iris drought tolerant?

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