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Herbaceous Perennial

Symphyotrichum novi-belgii Tonga ('Dasfour') (Island Series)

Michaelmas daisy [Tonga]

A compact, clump-forming perennial with mid-green leaves and clusters of double, bright purple daisy-like flowers with a yellow centre appearing from summer until the autumn.

Synonyms

Symphyotrichum novi-belgii 'Dasfour'
Aster 'Dasfour'
see moreAster novi-belgii 'Tonga'
Aster 'Tonga'
Aster 'Dwarf Tonga'
Aster Tonga

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Ultimate height

0.1–0.5 metres

Time to ultimate height

2–5 years

Ultimate spread

0.1–0.5 metres

Chalk

Clay

Loam

Sand

Moisture

Moist but well–drained, Well–drained

pH

Acid, Alkaline, Neutral

	Stem	Flower	Foliage	Fruit
Spring
Summer
Autumn
Winter

Full sun
Partial shade

Aspect

East–facing or North–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: Trade

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. Sow seed in containers in a cold frame in spring or autumn

Suggested planting locations and garden types

City and courtyard gardens
Cottage and informal garden
Coastal
Patio and container plants
Flower borders and beds

Pruning

No pruning required. Deadhead regularly. Cut back to the ground in late autumn

Pests

May be susceptible to aphids, eelworms (leaf and bud), Michalmas daisy mite, slugs and snails

Diseases

May be susceptible to Fusarium wilt, grey mould, leaf spot and powdery mildew

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