Troubleshooting
Aster 'Hella Lacy' problems — and how to fix them
Aster 'Hella Lacy' (Symphyotrichum novae-angliae 'Hella Lacy') 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.
Powdery mildew
Major problem on tall New England asters; site in full sun with good airflow and consider preventative sulphur treatment in susceptible conditions.
Stem lodging
Tall stems may flop on windy or over-fertile sites; support with link stakes or carry out the Chelsea chop in late May to reduce final height.
Aphids
Common on new growth in spring; treat early before colonies establish.
Septoria leaf spot
Lower leaves develop brown spots and drop; increase air circulation and remove affected foliage.
Crown congestion
Vigorous clumps become woody in the centre; divide every 2-3 years in spring for best performance.
Prevent aster 'hella lacy' problems before they start
Most aster 'hella lacy' issues are care-mismatch, not bad luck. Dial in the basics:
Aster 'Hella Lacy' problems — FAQ
Why is my aster 'hella lacy' powdery mildew?
Major problem on tall New England asters; site in full sun with good airflow and consider preventative sulphur treatment in susceptible conditions.
Why is my aster 'hella lacy' stem lodging?
Tall stems may flop on windy or over-fertile sites; support with link stakes or carry out the Chelsea chop in late May to reduce final height.
Why is my aster 'hella lacy' aphids?
Common on new growth in spring; treat early before colonies establish.
Why is my aster 'hella lacy' septoria leaf spot?
Lower leaves develop brown spots and drop; increase air circulation and remove affected foliage.
Why is my aster 'hella lacy' crown congestion?
Vigorous clumps become woody in the centre; divide every 2-3 years in spring for best performance.