Species

Iris ensataJapanese Iris

18 other cultivars

perennial

Japanese Iris Umi Botaru

Iris ensata 'Umi Botaru'

The Story

Plant Bio

Iris ensata 'Umi Botaru' is a graceful perennial with large, flat, sword-shaped leaves and striking, showy flowers that range from deep purple to violet, blooming in late spring to early summer.

This cultivar is distinguished by its particularly vibrant and densely packed blooms, along with its excellent tolerance to wet soils, making it ideal for pond margins and water gardens.

Uses & Benefits:

Adds a touch of elegance with its large, purple blooms and sword-like leaves, perfect for water features and shaded gardens.

Prefers moist soils making it a natural choice for pond edges and rain gardens.

Attracts beneficial insects and pollinators, supporting garden biodiversity.

SpeciesIris ensataJapanese Iris

Essentials

At a Glance

Plant Type

Perennial

Height

32 inches

Width

18 inches

Light

Full Sun, Partial Sun

Zones

4, 5, 6, 7, 8, 9

Water

Requires moist soil

Humidity

Prefers high humidity environments

Lifespan

10+ years

Native To

Asia

Toxicity

All parts are toxic if ingested

Planting

How to Grow

Select a location with full to partial sun and moist soil.
Tuck rhizomes 2 inches deep in well-drained soil during early spring.
Water regularly to keep soil moist but not waterlogged.
Mulch to retain moisture and suppress weeds.
Fertilize with a balanced fertilizer in early spring and mid-summer.
Divide clumps every 3-4 years in early spring or fall.

Pro Tip

Ensure consistent moisture for vibrant blooms and healthy growth.

Keep It Thriving

Care Guide

Do

Water regularly to keep soil moist 🌱
Divide every 3-4 years to promote healthy growth
Apply balanced fertilizer in spring and summer

Don't

Avoid letting soil dry out completely ❌
Don’t plant in heavy, waterlogged soil
Refrain from over-fertilizing to prevent rot

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

Water garden borderShaded pond edgeElegant perennial bed

Companion Plants

HostaFerns Astilbe Ligularia

Multiply

Propagation Methods

Good to Know

Common Questions

Japanese Iris Umi Botaru questions

What zones can Japanese Iris Umi Botaru grow in?

Japanese Iris Umi Botaru 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 Japanese Iris Umi Botaru deer resistant?

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

When does Japanese Iris Umi Botaru bloom?

Japanese Iris Umi Botaru typically blooms in early to mid-summer through late spring. Exact timing shifts a week or two with your zone — Sow's bloom calendar maps it to your garden.

Does Japanese Iris Umi Botaru need full sun?

Japanese Iris Umi Botaru does best in full sun to part shade. In hot climates, afternoon shade keeps blooms fresher longer.