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Herbaceous Perennial

Symphyotrichum novi-belgii 'Lady in Blue'
  • RHS Plants for pollinators

Michaelmas daisy 'Lady in Blue'

'Lady in Blue' is a compact, bushy plant growing to about 30cm tall with dark green foliage and lavender-blue, semi-double flowerheads with golden-yellow centres from late summer into autumn

Synonyms
Aster dumosus 'Lady in Blue'
Aster novi-belgii 'Lady in Blue'
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Size
Ultimate height
0.1–0.5 metres
Time to ultimate height
2–5 years
Ultimate spread
0.1–0.5 metres
Growing conditions
Chalk
Clay
Loam
Sand
Moisture
Moist but well–drained
pH
Acid, Alkaline, Neutral
Colour & scent
StemFlowerFoliageFruit
Spring Green
Summer Purple Green
Autumn Purple Green
Winter
Position
  • Full sun
  • Partial shade
Aspect

South–facing or East–facing or West–facing

Exposure
Exposed or Sheltered
Hardiness
H6
Botanical details
Family
Asteraceae
Native to the UK
No
Foliage
Deciduous
Habit
Bushy
Genus

Symphyotrichum includes around 90 species of annuals, biennials and perennials, mostly spread through the Americas, that were formerly included within the genus Aster. Leaves are simple, lance-shaped and entire, but it is their daisy-like flowerheads that they are grown for; central disc florets are typically yellow, surrounded by strap-shaped ray florets in shades of pink, blue, purple or white

Name status

Accepted

How to grow

Cultivation

Thrives in fertile, moist but well drained soil in sun or partial shade. Plants will benefit from mulching in autumn, and division every few years to maintain vigour. Will not tolerate waterlogging in winter. For more advice see aster cultivation

Propagation

Propagate by division in spring, replanting only vigorous young shoots

Suggested planting locations and garden types
  • Cottage and informal garden
  • Patio and container plants
  • Flower borders and beds
  • Cut flowers
Pruning

Cut back in late autumn

Pests

May be susceptible to slugs and snails on new growth, and to aphids, leaf and bud eelworms and tarsonemid mite

Diseases

May be susceptible to Fusarium wilt, powdery mildews, grey moulds and leaf spots

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