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Perennial · Asteraceae family

New York aster

Symphyotrichum novi-belgii

Full sun 0.6–1.5 m × 0.4–0.6 m Flowers September–October to −32 °C
Flower colours Click a colour

In short a 10-second read

SunFull sun
Size0.6–1.5 m
spacing 45 cm
FlowersSeptember–October
PlantingMarch–May, September–November
WinterNo winter protection

Where to plant and how much to water

Sun, soil and water.

It grows best in full sun, in average to moist soil.

Sun

Sun6 hours or more
Part shade3–6 hours
Shadeunder 3 h

Soil

tolerates any pH
acidicneutralalkaline
average to moistloamyhumus-rich

Watering

keep the soil evenly moistdo not waterlogless when it rains

Frost

−32 °C
no winter protectiondies back in winter, regrows in spring

How much space it takes

Mature size.

The mature plant next to a person (175 cm).

50 cm1 m1.5 m0.6–1.5 mspread 0.4–0.6 m
0.6–1.5 m× spread 0.4–0.6 m

Plant 45 cm apart.

Reaches maturity in about 2–5 years. The final size depends on the cultivar and the spot — we give the range from smallest to largest.

Calendar

Through the year.

Months for Central Europe. The line shows the current month.

The year at a glance

Flowers: JanuaryFlowers: FebruaryFlowers: MarchFlowers: AprilFlowers: MayFlowers: JuneFlowers: JulyFlowers: AugustFlowers: SeptemberFlowers: OctoberFlowers: NovemberFlowers: DecemberPlanting: JanuaryPlanting: FebruaryPlanting: MarchPlanting: AprilPlanting: MayPlanting: JunePlanting: JulyPlanting: AugustPlanting: SeptemberPlanting: OctoberPlanting: NovemberPlanting: DecemberFeeding: JanuaryFeeding: FebruaryFeeding: MarchFeeding: AprilFeeding: MayFeeding: JuneFeeding: JulyFeeding: AugustFeeding: SeptemberFeeding: OctoberFeeding: NovemberFeeding: DecemberJanFebMarAprMayJunJulAugSepOctNovDec
FlowersPlantingFeeding
Now, in October: a good time for planting (container plant).
JanFebMarAprMayJunJulAugSepOctNovDec

Flowers

JanFebMarAprMayJunJulAugSepOctNovDec

September–October · purple, pink, blue or red

Planting

JanFebMarAprMayJunJulAugSepOctNovDec

container plant: March–May, September–November

Feeding

JanFebMarAprMayJunJulAugSepOctNovDec

March–May

Feeding

Nutrition.

Light
balanced fertilisercompost or mulch
JanFebMarAprMayJunJulAugSepOctNovDec

Pests and diseases

Common problems and what to do.

The most common problems in Central Europe. Protection is listed from the gentlest option.

High riskMedium riskLow riskRisk for this plant according to the source · no label = no documented level

Grey mould

Botrytis cinerea
Medium riskdisease
More about this problem

What you will see

Grey fuzzy mould on dying parts, rot of buds and stems.

The source says: it is among the perennials susceptible to grey mould.

When to look

All year

How to protect

  1. Prevention
    • Remove dead leaves and spent flowers.
    • Adequate spacing and ventilation of the planting.
  2. By hand as soon as it appearsRemove affected parts and do not leave plant debris lying around.
Grey moulddisease · all yearMedium risk

What you will see

Grey fuzzy mould on dying parts, rot of buds and stems.

The source says: it is among the perennials susceptible to grey mould.

When to look

All year

How to protect

  1. Prevention
    • Remove dead leaves and spent flowers.
    • Adequate spacing and ventilation of the planting.
  2. By hand as soon as it appearsRemove affected parts and do not leave plant debris lying around.
More about this problem

What you will see

Holes in leaves and shiny trails, especially on young shoots in spring.

How to protect

  1. Prevention
    • Water in the morning so the plant dries off by evening.
    • Watch and protect young shoots in spring.
    • Encourage natural enemies (birds, toads, hedgehogs).
  2. By hand damp, mild evenings from spring to autumnCollect slugs and snails in the evening by torchlight; traps made of half an orange or containers of beer.
  3. Biological warm, moist soil, spring to early autumnPhasmarhabditis hermaphrodita nematodes watered into the soil (effective against slugs, less so against snails).
Slugs and snailspest

What you will see

Holes in leaves and shiny trails, especially on young shoots in spring.

How to protect

  1. Prevention
    • Water in the morning so the plant dries off by evening.
    • Watch and protect young shoots in spring.
    • Encourage natural enemies (birds, toads, hedgehogs).
  2. By hand damp, mild evenings from spring to autumnCollect slugs and snails in the evening by torchlight; traps made of half an orange or containers of beer.
  3. Biological warm, moist soil, spring to early autumnPhasmarhabditis hermaphrodita nematodes watered into the soil (effective against slugs, less so against snails).
More about this problem

What you will see

Colonies of tiny insects on shoots and buds, sticky honeydew, curled leaves.

When to look

Spring and summer

How to protect

  1. Prevention
    • Check plants regularly from spring.
    • Encourage ladybirds, hoverflies, lacewings and parasitic wasps.
  2. By hand as soon as it appearsRub off colonies by hand or wash them off with a jet of water.
  3. Biological spring to summerRelease lacewing larvae, aphid midge larvae or ladybirds.
  4. Gentle spray in a heavy infestation, repeatPotassium soap (fatty acids) or plant oil.
  5. Chemical — only when nothing else helps only as a last resortA product authorised in your country against aphids.
Aphidspest · spring and summer

What you will see

Colonies of tiny insects on shoots and buds, sticky honeydew, curled leaves.

When to look

Spring and summer

How to protect

  1. Prevention
    • Check plants regularly from spring.
    • Encourage ladybirds, hoverflies, lacewings and parasitic wasps.
  2. By hand as soon as it appearsRub off colonies by hand or wash them off with a jet of water.
  3. Biological spring to summerRelease lacewing larvae, aphid midge larvae or ladybirds.
  4. Gentle spray in a heavy infestation, repeatPotassium soap (fatty acids) or plant oil.
  5. Chemical — only when nothing else helps only as a last resortA product authorised in your country against aphids.
More about this problem

What you will see

Wilting and yellowing of one side of the plant, browning of tissue in the stem.

How to protect

  1. Prevention
    • Free-draining soil, change of planting site.
    • Healthy planting material.
  2. By hand as soon as it is foundDig up affected plants and dispose of them away from the compost.
Fusarium wiltdisease

What you will see

Wilting and yellowing of one side of the plant, browning of tissue in the stem.

How to protect

  1. Prevention
    • Free-draining soil, change of planting site.
    • Healthy planting material.
  2. By hand as soon as it is foundDig up affected plants and dispose of them away from the compost.
More about this problem

What you will see

Brown to black spots on leaves; leaves turn yellow early.

When to look

Spring – autumn

How to protect

  1. Prevention
    • Remove old leaves before they infect the new season.
    • Do not wet the leaves when watering; keep the plant unstressed.
  2. By hand after the first spots; in autumnRemove affected leaves at once and destroy them; collect fallen leaves in autumn.
Leaf spotsdisease · spring – autumn

What you will see

Brown to black spots on leaves; leaves turn yellow early.

When to look

Spring – autumn

How to protect

  1. Prevention
    • Remove old leaves before they infect the new season.
    • Do not wet the leaves when watering; keep the plant unstressed.
  2. By hand after the first spots; in autumnRemove affected leaves at once and destroy them; collect fallen leaves in autumn.
More about this problem
Sources (7)

What to combine it with

Same needs, different flowering.

They share the same sun and soil and flower in other months — so the bed flowers for longer.

spiked speedwell

spiked speedwell

0.3–0.9 m
✓flowers May–August
✓lower — for the front
giant onion

giant onion

0.9–1.5 m
✓flowers June–July
✓lower — for the front
candle larkspur

candle larkspur

0.9–1.5 m
✓flowers June–July
✓lower — for the front

Frequently asked

Quick answers.

When does New York aster flower?

In September–October; the flowers are purple, pink, blue or red.

Does New York aster tolerate shade?

No, it needs full sun.

How much space does New York aster need?

At maturity 0.4–0.6 m wide and 0.6–1.5 m tall; recommended spacing 45 cm.

Slugs and snails — what can you do?

Water in the morning so the plant dries off by evening. Collect slugs and snails in the evening by torchlight; traps made of half an orange or containers of beer.

Aphids — what can you do?

Check plants regularly from spring. Rub off colonies by hand or wash them off with a jet of water.

Sources (13) Checked 28 September 2026

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