perennial

Japanese Mugwort

The Story

Plant Bio

Artemisia princeps is a vigorous, upright herbaceous perennial native to East Asia that spreads rapidly via aggressive underground rhizomes. The deeply lobed, feather-shaped leaves feature a smooth dark green upper surface and a dense, felted white indumentum underneath.

This species is distinguished by its highly aromatic foliage, which releases a strong herbal scent when crushed, and its inconspicuous, buff to greenish-yellow flower heads. It is exceptionally cold-hardy and drought-tolerant once established, though its rapid stoloniferous growth requires active management to prevent garden takeover.

Uses & Benefits:

Provides striking textural contrast with its deeply lobed leaves and silver-white undersides.

Strongly deters deer and rabbits due to high concentrations of aromatic oils and thujone.

Wind-pollinated flowers offer minor pollen resources for generalist native bees and beneficial insects.

Essentials

At a Glance

Plant Type

Perennial

Height

47"

Width

59"

Light

Full Sun, Partial Sun

Zones

4, 5, 6, 7, 8, 9, 10

Water

Low once established

Humidity

High tolerance

Lifespan

Perennial

Native To

East Asia

Toxicity

Toxic if ingested in large quantities

Bloom period

Summer – Fall

In flower about 6 months of the year

Planting

How to Grow

Select a planting site in full sun to partial shade with well-drained sandy or loamy soil.
Install a solid plastic root barrier 12 to 18 inches deep around the planting area to contain rhizomes.
Plant divisions or potted starts at the same depth they were growing in their containers, watering in thoroughly.
Apply a light layer of mulch to retain moisture until established, avoiding rich fertilizers that stimulate invasive spreading.

Pro Tip

Install a physical root barrier at least 12 to 18 inches deep, or grow strictly in large bottomless containers sunk into the ground, to restrain the highly aggressive underground stolons.

Keep It Thriving

Care Guide

Do

Cut the entire plant back to ground level in late winter or early spring before new growth emerges.
Grow in containers or within deep root barriers to prevent aggressive underground spread.
Ensure the soil drains rapidly to prevent winter root rot.

Don't

Do not plant directly into open borders without physical containment.
Do not overwater or plant in low-lying areas prone to standing water.
Do not apply heavy fertilizers, which trigger unmanageable vegetative running.

Seasonal Care Calendar

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

Watch Out For

Pests & Diseases

Common Pests

Common Diseases

In the Garden

Landscape Uses & Companions

Landscape Uses

Herb GardenContainer PlantingErosion ControlSlope Stabilization

Companion Plants

Salvia officinalis Rosmarinus officinalis

Multiply

Propagation Methods

Good to Know

Common Questions

Japanese Mugwort questions

What zones can Japanese Mugwort grow in?

Japanese Mugwort is hardy in USDA Zones 4–10. Inside that range it survives winter in the ground; outside it, grow it as an annual or a container plant you protect.

Is Japanese Mugwort deer resistant?

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

When does Japanese Mugwort bloom?

Japanese Mugwort typically blooms in summer through fall. Exact timing shifts a week or two with your zone — Sow's bloom calendar maps it to your garden.

Does Japanese Mugwort need full sun?

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

Is Japanese Mugwort drought tolerant?

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