Not the plant you're looking for? Search over 300,000 plants

Herbaceous Perennial

Symphyotrichum novi-belgii 'Royal Ruby'

Michaelmas daisy 'Royal Ruby'

Clump-forming perennial with slender branched flowering stems about 50cm in height with lance-shaped mid-green leaves. From late summer to autumn bears clusters of daisy-like semi-double rich red flowerheads with yellow centres

Synonyms

Aster novi-belgii 'Royal Ruby'

Save to My plants

Buy this plant

Plant nurseries
5 suppliers

Ultimate height

0.5–1 metres

Time to ultimate height

2–5 years

Ultimate spread

0.1–0.5 metres

Chalk

Clay

Loam

Sand

Moisture

Moist but well–drained

pH

Acid, Alkaline, Neutral

	Stem	Flower	Foliage	Fruit
Spring
Summer
Autumn
Winter

Full sun
Partial shade

Aspect

East–facing or South–facing or West–facing

Exposure

Exposed or Sheltered

Hardiness
Hardiness ratings
All ratings refer to the UK growing conditions unless otherwise stated. Minimum temperature ranges (in degrees C) are shown in brackets
H1a: under glass all year (>15C)
H1b: can be grown outside in the summer (10 - 15)
H1c: can be grown outside in the summer (5 - 10)
H2: tolerant of low temperatures, but not surviving being frozen (1 to 5)
H3: hardy in coastal and relatively mild parts of the UK (-5 to 1)
H4: hardy through most of the UK (-10 to -5)
H5: hardy in most places throughout the UK even in severe winters (-15 to -10)
H6: hardy in all of UK and northern Europe (-20 to -15)
H7: hardy in the severest European continental climates (< -20)

Botanical details

Family: Asteraceae
Native to GB / Ireland: No
Foliage: Deciduous
Habit: Clump forming
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: Unresolved

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, and may need support, see staking (perennials). For more advice see aster cultivation

Propagation

Propagate by division in spring or root softwood basal cuttings in spring

Suggested planting locations and garden types

City and courtyard gardens
Cottage and informal garden
Gravel garden
Patio and container plants
Cut flowers
Flower borders and beds

Pruning

Cut stems close to the ground in late autumn

Pests

May be susceptible to leaf and bud eelworms, slugs and snails

Diseases

May be susceptible to Verticillium wilt, Powdery mildews and grey moulds

Get involved

The Royal Horticultural Society is the UK’s leading gardening charity. We aim to enrich everyone’s life through plants, and make the UK a greener and more beautiful place.