Troubleshooting
New England Aster 'Purple Dome' problems — and how to fix them
New England Aster 'Purple Dome' (Symphyotrichum novae-angliae 'Purple Dome') 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
The classic aster issue, though 'Purple Dome' is fairly resistant. Improve airflow, keep soil evenly moist and water at the base, not overhead.
Lower-leaf drop / scorch
Bottom leaves brown and drop when soil dries out. Maintain consistent moisture and mulch; it is a moisture-lover, not a drought plant.
Open, floppy habit
In shade or rich soil the neat dome breaks apart. Grow in full sun; an early-summer pinch keeps even this dwarf extra-compact.
Aging clump dieback
Old clumps can die out in the centre. Divide every 2-3 years in spring to keep vigour and bloom.
Prevent new england aster 'purple dome' problems before they start
Most new england aster 'purple dome' issues are care-mismatch, not bad luck. Dial in the basics:
- Common new england aster problems — the species this cultivar belongs to
- Common new england aster 'purple dome' problems — our other guide for the same plant
- What's wrong with my plant? — the diagnosis apps compared
- New England Aster 'Purple Dome' watering schedule
- New England Aster 'Purple Dome' light requirements
- Best soil mix for new england aster 'purple dome'
- New England Aster 'Purple Dome' temperature & humidity
- Full new england aster 'purple dome' care guide
Looking for new england aster 'purple dome' in general rather than its problems? Read the full new england aster 'purple dome' care guide — light, water, soil and feeding.
New England Aster 'Purple Dome' problems — FAQ
Why is my new england aster 'purple dome' powdery mildew?
The classic aster issue, though 'Purple Dome' is fairly resistant. Improve airflow, keep soil evenly moist and water at the base, not overhead.
Why is my new england aster 'purple dome' lower-leaf drop / scorch?
Bottom leaves brown and drop when soil dries out. Maintain consistent moisture and mulch; it is a moisture-lover, not a drought plant.
Why is my new england aster 'purple dome' open, floppy habit?
In shade or rich soil the neat dome breaks apart. Grow in full sun; an early-summer pinch keeps even this dwarf extra-compact.
Why is my new england aster 'purple dome' aging clump dieback?
Old clumps can die out in the centre. Divide every 2-3 years in spring to keep vigour and bloom.