Garden hybrid

This is a garden hybrid, bred from more than one wild species, so it has no single species page of its own.

299 other cultivars

perennial

Hosta Koriyama

Hosta x hybrida 'Koriyama'

The Story

Plant Bio

Hosta x hybrida 'Koriyama' is a perennial shade-loving plant featuring broad, lush green leaves and tall flower stalks bearing bell-shaped, lavender to purple flowers in summer.

This cultivar is distinguished by its vigorous growth, large foliage with a glossy finish, and its reliable performance in shaded garden corners.

Uses & Benefits:

Provides lush, decorative foliage year-round, with attractive lavender blooms in summer.

Shade-tolerant and deer resistant, ideal for low-maintenance gardens.

Supports beneficial insects and adds biodiversity to shaded garden areas.

Garden hybrid

Bred from more than one wild species, so it has no species page of its own.

Essentials

At a Glance

Plant Type

Perennial

Height

15 inches

Width

30 inches

Light

Partial Sun, Shade

Zones

4, 5, 6, 7, 8, 9

Water

Moderate

Humidity

Prefers humid environments

Lifespan

Perennial

Native To

Asia

Toxicity

Toxic to dogs, cats, and horses

Bloom period

Mid-summer – Late summer

In flower about 2 months of the year

Planting

How to Grow

Select a shaded spot with well-draining soil.
Tuck young plants into soil 2 inches deep and water thoroughly.
Mist cuttings regularly to maintain humidity.
Mulch around plants to retain moisture and suppress weeds.
Divide in early spring every 3-4 years for best growth.
Fertilize with a balanced, slow-release fertilizer in spring.

Pro Tip

Ensure soil remains consistently moist for optimal foliage growth.

Keep It Thriving

Care Guide

Do

Tuck seeds or divisions into moist soil 🌱
Prune dead leaves in early spring ✂️
Fertilize in spring with a balanced feed
Mulch to retain moisture and regulate soil temperature
Monitor for pests regularly

Don't

Don't expose to direct, harsh sunlight ❌
Avoid overwatering to prevent root rot ❌
Don't skip mulching in summer ❌
Never disturb roots during peak growing season ❌
Avoid using chemical pesticides unnecessarily

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

Shaded border with silvery foliageElegant woodland garden accent

Companion Plants

Ferns Astilbe HeucheraJapanese painted fern Ligularia

Multiply

Propagation Methods

Good to Know

Common Questions

Hosta Koriyama questions

What zones can Hosta Koriyama grow in?

Hosta Koriyama 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 Hosta Koriyama deer resistant?

Not reliably. Deer may browse Hosta Koriyama, especially tender spring growth — plan on repellents or fencing where pressure is high.

When does Hosta Koriyama bloom?

Hosta Koriyama typically blooms in mid-summer through late summer. Exact timing shifts a week or two with your zone — Sow's bloom calendar maps it to your garden.

Does Hosta Koriyama need full sun?

Hosta Koriyama does best in part shade.