White Heath Aster

Symphyotrichum ericoides

A bunch of white and yellow flowers in a field

White Heath Aster (Symphyotrichum ericoides) is a perennial native wildflower. Hardy in USDA zones 3 to 9.

Sun

Full sun

☀️

Zones

3–9

USDA hardiness

🗺️

Height

1-3 feet

📏

Planting Timeline

Zone:

Jan

Feb

Mar

Apr

May

Jun

Jul

Aug

Sep

Oct

Nov

Dec

Transplant

Direct Sow

Transplant

Direct Sow

Showing dates for White Heath Aster in USDA Zone 7

All Zone 7 native-wildflower →

Zone Map

Click a state to update dates

White Heath Aster · Zones 3–9

What grows well in Zone 7? →

Growing Details

Difficulty

Easy

Spacing18-24 inches

SoilWell-drained soil, tolerates poor to average fertility, drought-tolerant once established

pHAlkaline ( 8.0)

WaterDrought tolerant

SeasonPerennial

ColorWhite

Zone-by-Zone Planting Calendar

Zone	Indoor Start	Transplant	Direct Sow	Harvest
Zone 3	—	June – August	May – July	—
Zone 4	—	June – July	April – June	—
Zone 5	—	May – July	April – June	—
Zone 6	—	May – July	April – June	—
Zone 7	—	May – June	March – May	—
Zone 8	—	April – June	March – May	—
Zone 9	—	March – May	February – April	—

Complete Growing Guide

Light: Full sun (6 or more hours of direct sunlight a day). Soil: Clay, Loam (Silt), Sand, Shallow Rocky. Soil pH: Alkaline (>8.0). Drainage: Good Drainage, Occasionally Dry. Height: 1 ft. 6 in. - 3 ft. 0 in.. Spread: 1 ft. 0 in. - 1 ft. 6 in.. Spacing: 12 inches-3 feet. Growth rate: Medium. Maintenance: Low. Propagation: Division, Seed. Regions: Coastal, Mountains, Piedmont.

Harvesting

Peak readiness for White Heath Aster occurs when the small daisy-like flowers transition from tight buds to fully open blooms with visible yellow centers, typically displaying pristine white ray petals. Gently squeeze a bloom—the flower should feel firm yet fresh, not papery or brittle. This wildflower supports continuous harvesting throughout its late summer and fall bloom period; deadheading spent flowers encourages extended flowering rather than a single flush. For optimal results, harvest in early morning after dew dries but before afternoon heat, cutting stems just above a leaf node to promote branching and fuller arrangements.

Type: Achene.

Storage & Preservation

White Heath Aster flowers do not require storage for consumption as they are ornamental wildflowers, not edible. However, if harvesting for dried flower arrangements or botanical use, cut stems in the morning when flowers are fully open. Store in a cool, dry location (60-65°F, 40-50% humidity) away from direct sunlight. Dried flowers can be preserved for 6-12 months. Preservation methods include: (1) Air-drying bundles upside-down in a well-ventilated area for 2-3 weeks; (2) Silica gel drying for faster results and better color retention; (3) Pressing between newspaper for flat botanical specimens. Keep dried flowers in airtight containers to prevent moisture absorption.

History & Origin

Origin: Canada, northern central U.S.A., to Mexico

Advantages

+Attracts: Bees, Butterflies, Specialized Bees
+Low maintenance

Companion Plants

Purple Coneflower (Echinacea purpurea), Black-Eyed Susan (Rudbeckia hirta), and Little Bluestem (Schizachyrium scoparium) are the strongest pairings here. All three tolerate lean, well-drained soil at pH 6.5–8.0 without complaint, so none of them will outcompete Symphyotrichum ericoides in the nutrient department, and their staggered bloom windows keep pollinators cycling through from June into October. Wild Bergamot adds a mild pest-confusion effect through its aromatic foliage. Black Walnut is a hard no — juglone leaches from its roots and can stunt or kill asters across a wide radius, and unlike most toxicity warnings, this one shows up fast and ugly.

Plant Together

Purple Coneflower

Attracts beneficial pollinators and shares similar growing conditions and bloom timing

Black-Eyed Susan

Creates pollinator habitat succession and both thrive in similar soil conditions

Little Bluestem Grass

Provides structural support and creates natural prairie ecosystem balance

Wild Bergamot

Attracts diverse beneficial insects and both prefer well-drained soils

Goldenrod

Blooms simultaneously creating abundant late-season nectar sources for pollinators

New England Aster

Cross-pollination benefits and shared resistance to common aster diseases

Prairie Dropseed

Grass companion that provides wind protection without competing for nutrients

Wild Lupine

Nitrogen-fixing legume that enriches soil for the aster's benefit

Keep Apart

Black Walnut

Produces juglone toxin that inhibits growth and can kill aster family plants

Crown Vetch

Aggressive invasive groundcover that outcompetes and smothers native asters

Tree of Heaven

Allelopathic properties suppress native wildflower growth and establishment

Pests & Disease Resistance

Common Pests

Spider mites, aphids, leafhoppers

Diseases

Powdery mildew, rust, leaf spot

Troubleshooting White Heath Aster

What you'll see, why it happens, and what to do about it.

White powdery coating on leaves and stems, usually appearing mid-to-late summer

Likely Causes

Powdery mildew (Erysiphe cichoracearum or related species) — thrives in warm days, cool nights, and low airflow
Overcrowded planting that traps humidity around the foliage

What to Do

1.Cut affected stems back by about a third to open up the plant; this alone often stops the spread
2.Space plants at least 18 inches apart — crowding is usually what starts it
3.If it's bad two years running, divide the clump in early spring and replant with more room

Stippled, silvery or bronzed leaves with fine webbing on the undersides, worst during dry spells

Likely Causes

Two-spotted spider mites (Tetranychus urticae) — populations explode in hot, dry conditions above 85°F
Dusty conditions on unpaved paths or bare soil nearby

What to Do

1.Knock mites off with a strong stream of water from a hose — do it in the morning so foliage dries before evening
2.Mulch around the base to reduce dust and keep soil moisture more even
3.If the infestation is heavy, apply insecticidal soap directly to the undersides of leaves; repeat every 5–7 days for two or three applications

Clusters of small, soft insects on new growth tips, leaves curling or looking sticky

Likely Causes

Aphids (commonly Aphis or Macrosiphum spp.) — tend to colonize the tender new growth first
Ant activity nearby, which often signals aphids because ants farm them for honeydew

What to Do

1.Spray the colonies off with water — check under the leaves, not just the tops
2.Tolerate light infestations; White Heath Aster attracts predatory wasps and ladybugs that will move in within a week or two
3.For heavy infestations, apply neem oil in the early morning or evening to avoid harming visiting pollinators

Frequently Asked Questions

Is White Heath Aster a good choice for beginning wildflower gardeners?▼

Yes, White Heath Aster is excellent for beginners. It's extremely hardy (USDA zones 3-9), requires minimal maintenance once established, and thrives in full sun with average to poor soil. It's drought-tolerant once rooted and rarely needs fertilizing, making it a forgiving option for novice gardeners looking to add native wildflowers to their landscape.

How long does White Heath Aster take to germinate?▼

White Heath Aster seeds typically germinate in 7-14 days under appropriate conditions. However, germination may benefit from a period of cold stratification (moist chilling for 4-6 weeks) to improve germination rates and mimic natural winter conditions. Seedlings usually develop quickly after germination.

Can you grow White Heath Aster in containers?▼

Yes, White Heath Aster can be grown in containers, though it performs better in garden beds. Use well-draining potting soil and containers at least 12 inches deep. Container plants may need more frequent watering during dry periods and benefit from occasional feeding. Ensure containers receive 6+ hours of direct sunlight daily for best flowering.

When should I plant White Heath Aster seeds?▼

Sow White Heath Aster seeds outdoors in spring after the last frost, or in fall for winter stratification and spring germination. Alternatively, start seeds indoors 6-8 weeks before the last spring frost, then transplant seedlings outdoors. Seeds can also be direct sown in late fall for natural winter cold-stratification.

What is the optimal spacing for White Heath Aster plants?▼

Space White Heath Aster plants 18-24 inches apart to allow adequate air circulation, reduce disease risk, and accommodate mature plant size. This spacing promotes a fuller, bushier appearance when plants mature and prevents overcrowding that could invite fungal issues in humid climates.

What are the white flowers of Heath Aster useful for?▼

White Heath Aster flowers are primarily valued as ornamental additions to native plant gardens and wildflower meadows. They attract pollinators like butterflies and bees throughout fall, support native wildlife, and provide late-season color when many other plants are fading. They're also popular for dried flower arrangements and botanical crafts.