GardenWizzPlant Care Card

Michaelmas daisy

Symphyotrichum novi-belgii · Perennial

Hardiness
H6 Very hardy (RHS profile linked: −20 to −15°C)
Position
Full sun
Height × Spread
40–120 cm × 50–100 cm
Soil
Moist but well-drained
Flowering
September–November
Toxicity
No specific toxicity is listed by the RHS. This is not a guarantee of safety — check with a vet or the ASPCA before pets or children eat any plant.

The Gardening Year

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F
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M
J
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🌱 Sow
🪴 Plant out
🌸 In flower

Watch out for

Powdery mildew: Ensure good air circulation, avoid overhead watering, and choose resistant varieties.

Slugs and snails: Use physical barriers like copper tape or apply iron phosphate pellets around the base.

Aphids: Spray off with a strong jet of water or use insecticidal soap for severe infestations.

Fusarium wilt: Remove and destroy infected plants immediately; avoid replanting asters in the same spot.

Leaf and bud eelworms: Remove affected plant parts and dispose of them; rotate crops to break the life cycle.

Grey mould (Botrytis): Improve air circulation, remove dead foliage, and avoid wetting the foliage when watering.

Full guide: gardenwizz.com/plants/michaelmas-daisy© GardenWizz — UK gardening encyclopedia