Aster spectabilis (Eastern Showy Aster) — Clump-forming, upright to bushy

Overview

Aster spectabilis is a clump-forming, upright to bushy perennial in the genus Aster, part of the Asteraceae family, with deciduous; simple, often narrow and roughly textured foliage. Aster spectabilis grows best in full sun, and tolerates fertile loam; avoid thin and dry soils soils and neutral to slightly alkaline pH. Its UK hardiness is rated H6–H7. Suggested uses include borders, wildflower gardens and naturalized areas. It is native to Eastern North America.

About

Aster spectabilis is a clump-forming perennial in the Asteraceae that produces late-season violet-purple ray florets with yellow centres. It has upright, well-branched stems carrying simple, often narrow leaves with a rough texture and is deciduous. Flowering occurs from August to October, providing colour as many summer perennials finish. It suits sunny, fertile sites with reliably moist, well-drained loam.

Wikipedia contributors, CC BY-SA 4.0 — Eurybia spectabilis

About the genus

Aster is a genus of perennial flowering plants in the family Asteraceae. Its circumscription has been narrowed, and it now encompasses around 170 species, all but one of which are restricted to Eurasia; many species formerly in Aster are now in other genera of the tribe Astereae. Aster amellus is the type species of the genus and the family Asteraceae.

Wikipedia contributors, "Aster (genus)", CC BY-SA 4.0 — Aster (genus)

In the garden

Aster spectabilis originates from eastern North America and is valued for its autumn flowering. It forms upright, clump-forming plants with simple, narrow leaves and flashes of violet‑purple rays surrounding yellow disc florets from August to October. In its native range it favours sandy or loamy ground and open woodland edges, which explains its tolerance of both exposed and sheltered positions in a garden. Plant into fertile loam kept moist but well drained and avoid thin, dry soils; a neutral to slightly alkaline pH is preferred. Give it a sunny spot on a south, east or west facing aspect where it will receive strong light through the day. Hardiness is H6–H7, meaning it is very hardy to fully hardy across most of the UK and will survive typical winter conditions without special protection. Use Aster spectabilis in mixed herbaceous borders, wildflower schemes and naturalised areas where autumn colour is required. Group plants rather than scatter single specimens to deliver a noticeable late-season display; the distinct violet‑purple rays and yellow centres are especially effective where they can be seen close to paths or seating areas during August to October.

Growing conditions

Best soil and position for Aster

Sunlight: Full sun
Soil type: Fertile loam; avoid thin, dry soils
Soil pH: Neutral to slightly alkaline
Soil moisture: Moist but well drained
Aspect: South, east or west facing
Exposure: Exposed or sheltered
UK hardiness: H6–H7

Plant details

Aster spectabilis size, habit and characteristics

Plant type: Perennial
Habit: Clump-forming, upright to bushy
Foliage: Deciduous; simple, often narrow and roughly textured
Suggested uses: Borders, wildflower gardens, naturalized areas
Native to: Eastern North America

Care notes

Pruning and caring for Aster spectabilis

Cultivation: Plant in an open, airy position — crowding is what brings on mildew. Divide every second or third year to maintain vigour, and pinch or Chelsea-chop the taller kinds in late spring to reduce the need for staking.
Pruning: Deadhead to prolong the display, then cut stems to the base after flowering, or leave them standing through winter for structure and wildlife.
Propagation: Divide in spring, replanting only the vigorous outer growth. Basal cuttings taken in spring root readily.
Pest resistance: Slugs may take young shoots in spring; otherwise generally trouble-free.
Disease resistance: Powdery mildew is the main weakness, especially among the older novi-belgii cultivars. The frikartii hybrids and the aster relatives are markedly more resistant.

Frequently asked questions

How do I grow Aster spectabilis?

Plant in an open, airy position — crowding is what brings on mildew. Divide every second or third year to maintain vigour, and pinch or Chelsea-chop the taller kinds in late spring to reduce the need for staking.

Where is the best place to plant Aster spectabilis?

Aster spectabilis prefers full sun. It suits exposed or sheltered positions.

What soil does Aster spectabilis need?

Aster spectabilis grows best in fertile loam; avoid thin and dry soils soil. It prefers neutral to slightly alkaline soil. Aim for soil that stays moist but well drained.