perennial

Japanese Aster

Aster ageratoides 'Adustus Nanus'

The Story

Plant Bio

Aster ageratoides, native to East Asia, is a robust, spreading herbaceous perennial that forms dense mats of foliage via underground stolons. The species produces loose clusters of daisy-like flower heads with yellow centers from late summer through the end of fall.

'Adustus Nanus' is a highly compact, low-growing selection that reaches only six to eight inches in height while spreading up to three feet wide. Its lavender to pale lilac flowers completely cover the dark green foliage, creating a dense groundcover that resists powdery mildew.

Uses & Benefits:

Forms a dense, low-growing carpet of lavender flowers that provides late-season color when other perennials fade.

Functions as an effective, low-maintenance groundcover that suppresses weeds and tolerates heat and drought.

Attracts bees, butterflies, and other beneficial insect pollinators during late summer and fall.

Essentials

At a Glance

Plant Type

Perennial

Height

Width

36"

Light

Full Sun, Partial Sun

Zones

5, 6, 7, 8, 9

Water

Low to Moderate

Humidity

High

Lifespan

Perennial

Native To

Asia

Toxicity

Non-toxic

Bloom period

Summer – Fall

In flower about 6 months of the year

Planting

How to Grow

Plant in a location that receives full sun to partial shade in well-drained soil.
Water regularly during the first growing season to establish a deep, extensive root system.
Apply a light layer of organic mulch around the base to retain moisture and suppress weeds while the groundcover spreads.
Cut the entire plant back close to the ground in late winter or early spring before new shoots emerge.

Pro Tip

Avoid over-fertilizing or planting in highly enriched soils; excess nutrients cause the plant to develop a weak, open center and reduce flowering density.

Keep It Thriving

Care Guide

Do

Plant in well-drained soil to prevent root rot.
Divide the clump every three to four years in spring to maintain vigor and control spread.
Space plants two to three feet apart to allow for their wide, mounding growth habit.

Don't

Do not apply heavy fertilizers, as excess nutrients cause floppy, weak stems.
Do not prune heavily into old, leafless woody stems at the base of the plant.
Do not plant in poorly drained, soggy sites where standing water persists.

Seasonal Care Calendar

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

Watch Out For

Pests & Diseases

Common Pests

Common Diseases

In the Garden

Landscape Uses & Companions

Landscape Uses

GroundcoverRock gardensBorder edgingMass planting

Companion Plants

Sedum Pennisetum alopecuroides Echinacea purpurea

Multiply

Propagation Methods

Good to Know

Common Questions

Japanese Aster questions

What zones can Japanese Aster grow in?

Japanese Aster is hardy in USDA Zones 5–9. Inside that range it survives winter in the ground; outside it, grow it as an annual or a container plant you protect.

Is Japanese Aster deer resistant?

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

When does Japanese Aster bloom?

Japanese Aster 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 Aster need full sun?

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

Is Japanese Aster drought tolerant?

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