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Flat-topped Aster

Name: Flat-topped Aster
Brand: Akène
SKU: AKE-SEMENCES
Price: 4.99 CAD
Availability: OutOfStock

Common name Flat-Topped White Aster

Latin name Doellingeria umbellata

Quantity per packet Minimum of 300 seeds

This native perennial strongly supports biodiversity through its nectar-rich late-season flowers. It also contributes to soil stabilization and the restoration of moist natural habitats.

Product information

Product
identification

Common nameFlat-Topped White Aster

Latin nameDoellingeria umbellata

FamilyAsteraceae

TypeNative perennial

CyclePerennial

Quantity per packMinimum of 300 seeds

Product
description

Flat-Topped White Aster (Doellingeria umbellata) is a tall native perennial distinguished by its broad clusters of bright, highly decorative white flowers from July to September. Its upright habit, reaching 1.2 to 1.75 m (4 to 5.7 ft) in height, adds strong vertical structure to naturalistic borders, moist shorelines, and pollinator gardens. Its green foliage creates a soft, natural presence, perfect for enriching ecological landscapes in Quebec. Hardy to -40°C (-40°F), this deciduous perennial returns reliably each year and extends late-season ornamental interest while actively supporting biodiversity.

Flat-Topped White Aster prefers full sun to light partial shade in fertile, moist to wet, well-drained loamy to clay soil. It does not tolerate prolonged drought well during active growth, so regular watering encourages abundant flowering and a vigorous habit. Sow seeds in autumn or in spring after cold stratification, lightly covering them with 3 to 5 mm of moist growing medium. A light application of compost in spring is usually enough to support healthy growth. Dry stems may be left standing through winter to shelter beneficial insects, then cut back the following spring.

In the garden, Flat-Topped White Aster is ideal for riparian buffers, rain gardens, naturalized plantings, and ecological restoration projects. It pairs beautifully with Spotted Joe-Pye Weed, Prairie Ironweed, Northern Blue Flag Iris, and Cardinal Flower, creating plantings rich in texture and biodiversity. Its late-season bloom provides nectar and pollen for bees, butterflies, and other beneficial insects as floral resources begin to decline. Achenes left in place may also support some birds, further strengthening the ecological value of this elegant and long-lived native perennial.

Sowing
guide

Sowing periodAutumn or spring after cold stratification

Best time

Autumn or spring after stratification

Sowing depth3 to 5 mm

Spacing / density

45 to 60 cm (18 to 24 in)

Germination temperature18 to 22°C (64 to 72°F)

Germination time15 to 20 days

Propagation

Propagate by seed or by dividing established clumps.

Growing
method

Sow Doellingeria umbellata seeds in autumn or in spring after a period of cold stratification to improve germination. Cover the seeds lightly with 3 to 5 mm of growing medium and maintain consistent moisture. Germination typically occurs within 15 to 20 days at temperatures between 18 and 22°C (64 to 72°F). Flat-Topped White Aster grows best in fertile, moist soils in full sun to light partial shade. Once established, it returns reliably each year and gradually forms impressive flowering colonies. Its late-season blooms provide an essential nectar source for pollinators.

Soil
and care

ExposureFull sun to partial shade

Soil

Fertile, moist to wet, well-drained loamy to clay soil

Soil pH5.5 to 7.0

Watering

Water regularly to maintain consistently moist soil. This species does not tolerate prolonged drought once actively growing.

Fertilization

A light application of compost or balanced organic fertilizer in spring is generally sufficient. Rich soils promote vigorous growth and abundant flowering.

Care levelModerate

In spring, remove the previous year's dry stems and apply a layer of compost around the plant. Keep the soil consistently moist throughout the growing season to encourage abundant flowering. During prolonged drought, provide supplemental watering. Leave the faded flower heads standing through winter to feed birds and encourage natural reseeding. Cut back the stems the following spring to protect overwintering beneficial insects.

Container
growing

Recommended pot size

30 to 40 cm (12 to 16 in)

Flat-Topped White Aster can be grown in a large, deep container filled with a rich growing medium that retains moisture well. This native perennial appreciates regular watering because it naturally grows along moist shorelines and in wet meadows. In containers, it provides abundant late-season flowers after many other perennials have finished blooming while attracting a wide diversity of pollinators. Its tall habit also adds impressive vertical structure to patios and terraces.

Bloom,
harvest
and garden

Its abundant white blooms brighten late-season gardens while supporting a remarkable diversity of pollinators. This native perennial also contributes to wetland restoration and ecological landscaping.

This native perennial strongly supports biodiversity through its nectar-rich late-season flowers. It also contributes to soil stabilization and the restoration of moist natural habitats.

Garden use

Flat-Topped White Aster is ideal for pollinator gardens, rain gardens, streambanks, and ecological restoration projects. It combines beautifully with Spotted Joe-Pye Weed, Prairie Ironweed, Northern Blue Flag Iris, and other moisture-loving native perennials. Its late-season blooms brighten natural landscapes while providing valuable nectar and pollen for pollinators.

Bloom period

Large clusters of white flowers attract abundant bees, butterflies, and other beneficial pollinating insects.

Flower colorWhite

Foliage colorGreen

Harvest

September to October

Fruiting

Achenes

Wildlife appealBees and pollinators

Size
and facts

Height1.2 to 1.75 m (4 to 5.7 ft)

Spread45 to 75 cm (18 to 30 in)

Growth rateModerate

Hardiness zoneUSDA Zones 3–8

Minimum temperature-40°C (-40°F)

Foliage typeDeciduous

Papillonstrue

Insectes utilestrue

Planting
partners

Good companions

Spotted Joe-Pye Weed, Prairie Ironweed, Northern Blue Flag Iris, Cardinal Flower

Avoid planting with

Lavender, Cotton Lavender, Blanket Flower, Sedum

Recipe
and inspiration

Flat-Topped White Aster is not generally grown for culinary purposes but rather for its exceptional ornamental and ecological value. Its elegant flowers are attractive in natural bouquets and pollinator-friendly landscapes. Its greatest contribution comes from its late-season bloom, which provides an important source of nectar and pollen for bees, butterflies, and other beneficial insects. The seeds may also provide food for some birds during autumn.

Frequently asked questions

When should I sow Flat-Topped White Aster seeds? +

Sow Flat-Topped White Aster seeds in autumn or in spring after cold stratification to encourage more uniform germination.

Why does Flat-Topped White Aster attract so many pollinators? +

Its abundant late-season flowers provide large amounts of nectar and pollen at a time when many other flowering plants have finished blooming.

Can Flat-Topped White Aster grow in moist soil? +

Yes. Doellingeria umbellata naturally grows in moist meadows, wet ditches, and along streambanks where soils remain consistently moist.

Is Doellingeria umbellata suitable for biodiversity gardens? +

Yes. This native perennial is an outstanding choice for pollinator gardens, ecological restoration, and biodiversity-focused landscapes.

How do you care for Flat-Topped White Aster? +

An annual application of compost, consistently moist soil, and cutting back the previous year's stems in spring are generally all that is needed to keep this perennial healthy.

The availability of our seeds varies depending on seasonal availability, production schedules and supplier inventory. Certain varieties may only be offered for a limited time based on their natural growth cycle, sowing period or available stock. These product pages are designed to help and inspire gardeners in choosing the right seeds for vegetable gardens, flower beds, pollinator gardens, container growing, naturalization projects and sustainable outdoor spaces.