Troubleshooting
Aster 'Harrington's Pink' problems — and how to fix them
Aster 'Harrington's Pink' (Symphyotrichum novae-angliae 'Harrington's Pink') is generally forgiving once you match its basics, but a few issues come up again and again. Here is what each one looks like, why it happens, and the fix.
Stem lodging
One of the tallest New England asters; stake on exposed sites or use the Chelsea chop to reduce height by 30-40% in late May.
Powdery mildew
More resistant than novi-belgii but not immune; ensure full sun and airflow to minimise incidence.
Crown congestion
Central crowns become woody and unproductive after 2-3 years; divide regularly in spring.
Aphids
Appear on shoot tips in spring; treat early with insecticidal soap or neem oil.
Septoria leaf spot
Brown lesions on lower leaves in humid conditions; remove affected leaves and avoid overhead watering.
Prevent aster 'harrington's pink' problems before they start
Most aster 'harrington's pink' issues are care-mismatch, not bad luck. Dial in the basics:
Aster 'Harrington's Pink' problems — FAQ
Why is my aster 'harrington's pink' stem lodging?
One of the tallest New England asters; stake on exposed sites or use the Chelsea chop to reduce height by 30-40% in late May.
Why is my aster 'harrington's pink' powdery mildew?
More resistant than novi-belgii but not immune; ensure full sun and airflow to minimise incidence.
Why is my aster 'harrington's pink' crown congestion?
Central crowns become woody and unproductive after 2-3 years; divide regularly in spring.
Why is my aster 'harrington's pink' aphids?
Appear on shoot tips in spring; treat early with insecticidal soap or neem oil.
Why is my aster 'harrington's pink' septoria leaf spot?
Brown lesions on lower leaves in humid conditions; remove affected leaves and avoid overhead watering.