perennial

Sapphire Aster

Symphyotrichum dumosum 'Sapphire'

Not currently listed at our partner nurseries.

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Essentials

At a Glance

Plant Type

Perennial

Height

15 inches

Width

18 inches

Light

Full Sun, Partial Sun

Zones

4, 5, 6, 7, 8

Water

Moderate once established

Humidity

Average garden humidity

Lifespan

Perennial

Native To

North America

Toxicity

Non-toxic

The Story

Plant Bio

Symphyotrichum dumosum, commonly known as a dwarf aster, is a compact perennial with bushy, leafy stems and clusters of small, daisy-like flowers featuring vibrant purple-blue petals and yellow centers. The cultivar Sapphire is distinguished by its intense, vivid blue flowers that maintain their coloration throughout the flowering period, making it a striking addition to borders and rock gardens.

Bloom Period:

EarlyLate

Uses & Benefits:

Bright purple flowers add vibrant color to garden borders and meadows.

Drought tolerant, requires minimal watering once established.

Provides nectar for pollinators and seeds for birds.

Marketplace

Where to Buy

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

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Planting

How to Grow

Tuck seeds into well-draining soil in early spring.
Water regularly until established, about 6 weeks.
Place in full sun for best blooms.
Deadhead spent flowers to encourage more blooms.
Divide clumps every 2-3 years in early spring.
Mulch to retain moisture and suppress weeds.

Pro Tip

Ensure good drainage to prevent root rot during wet seasons.

Keep It Thriving

Care Guide

Do

Water deeply during dry spells 🌱
Deadhead regularly for continuous blooms
Divide every 2-3 years for healthy growth

Don't

Overwater in winter ❌
Skip pruning after flowering
Use heavy clay soil without amendments

Seasonal Care Calendar

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

Watch Out For

Pests & Diseases

Common Pests

Common Diseases

In the Garden

Landscape Uses & Companions

Landscape Uses

Violet-flowered border for cottage gardensWildflower meadow accentPollinator-friendly garden edge

Companion Plants

Echinacea purpurea Rudbeckia hirta Solidago spp. Coreopsis spp. Sedum spp.

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 through late 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 to part shade. In hot climates, afternoon shade keeps blooms fresher longer.