Troubleshooting
Dahlia 'Fire Magic' problems — and how to fix them
Dahlia 'Fire Magic' (Dahlia 'Fire Magic') 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
White fungal coating most prevalent from late summer; reduce risk by watering at the base, improving airflow, and applying a preventive sulphur or potassium bicarbonate spray.
Earwigs
Hide within large blooms and chew petals; trap with stuffed newspaper tubes placed around plant stems and check each morning.
Slugs and snails
Attack young emerging shoots in spring; use biological nematode treatments or iron-phosphate pellets when shoots first appear.
Leafhopper (aster yellows)
Leafhoppers can transmit aster yellows phytoplasma; remove infected plants immediately and control leafhoppers with appropriate insecticides to limit spread.
Hollow stems
Caused by irregular watering or boron deficiency; maintain even moisture and apply a trace element feed if the problem recurs.
Prevent dahlia 'fire magic' problems before they start
Most dahlia 'fire magic' issues are care-mismatch, not bad luck. Dial in the basics:
Dahlia 'Fire Magic' problems — FAQ
Why is my dahlia 'fire magic' powdery mildew?
White fungal coating most prevalent from late summer; reduce risk by watering at the base, improving airflow, and applying a preventive sulphur or potassium bicarbonate spray.
Why is my dahlia 'fire magic' earwigs?
Hide within large blooms and chew petals; trap with stuffed newspaper tubes placed around plant stems and check each morning.
Why is my dahlia 'fire magic' slugs and snails?
Attack young emerging shoots in spring; use biological nematode treatments or iron-phosphate pellets when shoots first appear.
Why is my dahlia 'fire magic' leafhopper (aster yellows)?
Leafhoppers can transmit aster yellows phytoplasma; remove infected plants immediately and control leafhoppers with appropriate insecticides to limit spread.
Why is my dahlia 'fire magic' hollow stems?
Caused by irregular watering or boron deficiency; maintain even moisture and apply a trace element feed if the problem recurs.