perennialN. America Native

Sapphire Aster

Aster dumosus 'Sapphire'

Not currently listed at our partner nurseries.

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Essentials

At a Glance

Plant Type

Perennial

Height

15 inches

Width

15 inches

Light

Full Sun

Zones

4, 5, 6, 7, 8

Water

Moderate

Humidity

Average

Lifespan

Perennial

Native To

North America

Toxicity

Non-toxic to humans and pets

The Story

Plant Bio

Aster dumosus 'Sapphire' is a compact, mound-forming perennial with deep blue flowers. This cultivar is noted for its rich blue color, which stands out in autumn gardens.

Uses & Benefits:

Bright blue flowers add striking color to gardens and landscapes.

Low-maintenance perennial ideal for borders and containers.

Provides nectar for pollinators like bees and butterflies.

Marketplace

Where to Buy

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Shipping costs Year-round shipping Free shipping

Planting

How to Grow

Tuck seeds into well-draining soil in early spring.
Water regularly to keep soil moist but not waterlogged.
Mist cuttings to encourage root development during propagation.
Thin out crowded plants to improve air circulation in late spring.
Fertilize monthly during active growth for best blooms.
Deadhead spent flowers to promote continuous flowering.

Pro Tip

Plant in full sun for vibrant blooms and healthy growth.

Keep It Thriving

Care Guide

Do

Water consistently during dry spells 🌱
Prune dead or damaged stems after flowering
Apply balanced fertilizer monthly during growing season

Don't

Avoid overwatering to prevent root rot ❌
Don’t neglect pruning to maintain shape
Keep away from heavy clay soil without amendments

Seasonal Care Calendar

Task	Jan	Feb	Mar	Apr	May	Jun	Jul	Aug	Sep	Oct	Nov	Dec
Divide
Pinch
Winter Prep

Watch Out For

Pests & Diseases

Common Pests

Common Diseases

In the Garden

Landscape Uses & Companions

Landscape Uses

Vibrant perennial borderLow-maintenance flower bedColorful container plant

Companion Plants

Sedum Coreopsis Echinacea Gaillardia Rudbeckia

Multiply

Propagation Methods

Good to Know

Common Questions

Sapphire Aster questions

What zones can Sapphire Aster grow in?

Sapphire Aster is hardy in USDA Zones 4–8. Inside that range it survives winter in the ground; outside it, grow it as an annual or a container plant you protect.

Is Sapphire Aster deer resistant?

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

When does Sapphire Aster bloom?

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

Does Sapphire Aster need full sun?

Sapphire Aster does best in full sun (6+ hours).