perennial

Licorice Japanese Sweet Flag

Acorus gramineus 'Licorice'

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Essentials

At a Glance

Plant Type

Perennial

Height

8 inches

Width

12 inches

Light

Full Sun, Partial Sun, Shade

Zones

5, 6, 7, 8, 9

Water

Moist to wet soil

Humidity

Prefers humid environments

Lifespan

Perennial

Native To

Asia

Toxicity

Non-toxic to humans and pets

The Story

Plant Bio

Acorus gramineus 'Licorice' is a low-growing, grass-like perennial with slender, arching leaves that form dense clumps, producing subtle green flowers in late spring to early summer. This cultivar is distinguished by its dark, nearly black foliage that adds dramatic contrast to garden plantings and its tolerance for wet or poorly-drained soils.

Bloom Period:

EarlyLate

Uses & Benefits:

Provides lush green foliage year-round, adds texture to shaded areas.

Thrives in wet soils, useful for erosion control on damp slopes.

Supports local pollinators and provides cover for small wildlife.

Marketplace

Where to Buy

We couldn't find this plant listed online right now.

Shipping costs Year-round shipping Free shipping

Planting

How to Grow

Tuck seeds or divisions into moist soil in early spring.
Mist cuttings regularly to maintain humidity.
Ensure soil remains consistently moist for best growth.
Place in partial shade for optimal foliage color.
Water deeply once a week during dry periods.
Mulch around plants to retain moisture and suppress weeds.

Pro Tip

Plant in moist, well-drained soil with partial shade for best results.

Keep It Thriving

Care Guide

Do

Water regularly to keep soil moist 🌱
Mulch to conserve moisture
Divide every 2-3 years to maintain vigor
Place in partial shade for optimal growth

Don't

Avoid dry, well-drained soils ❌
Don’t expose to full sun in hot climates ❌
Over-fertilize to prevent leggy growth ❌

Seasonal Care Calendar

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

Watch Out For

Pests & Diseases

Common Pests

Common Diseases

In the Garden

Landscape Uses & Companions

Landscape Uses

Wet garden borderShaded pond edgeGrassy groundcover

Companion Plants

Ferns Hostas Ligularia Astilbe

Multiply

Propagation Methods

Good to Know

Common Questions

Licorice Japanese Sweet Flag questions

What zones can Licorice Japanese Sweet Flag grow in?

Licorice Japanese Sweet Flag is hardy in USDA Zones 5–10. Inside that range it survives winter in the ground; outside it, grow it as an annual or a container plant you protect.

Is Licorice Japanese Sweet Flag deer resistant?

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

When does Licorice Japanese Sweet Flag bloom?

Licorice Japanese Sweet Flag typically blooms in late spring through late spring. Exact timing shifts a week or two with your zone — Sow's bloom calendar maps it to your garden.

Does Licorice Japanese Sweet Flag need full sun?

Licorice Japanese Sweet Flag does best in full sun to part shade. In hot climates, afternoon shade keeps blooms fresher longer.