Troubleshooting
Wave Petunia problems — and how to fix them
Wave Petunia (Petunia × atkinsiana 'Wave') 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.
Sparse or stalled bloom
Almost always under-feeding or too little sun. Wave types are heavy feeders; resume weekly fertiliser and ensure 6+ hours of direct light.
Botrytis (grey mould) on flowers
Brown, mushy petals in cool, wet, crowded conditions. Improve airflow, water at the base, and remove spent blooms promptly.
Budworm / tobacco budworm
Caterpillars bore into buds, leaving holes and shredded petals and stopping flowering. Pick by hand or treat with Bacillus thuringiensis (Bt).
Drought wilt
Baskets dry out fast and wilting hard sets back bloom; keep the rootball evenly moist and never let it bone-dry in heat.
Prevent wave petunia problems before they start
Most wave petunia issues are care-mismatch, not bad luck. Dial in the basics:
Looking for wave petunia in general rather than its problems? Read the full wave petunia care guide — light, water, soil and feeding.
Wave Petunia problems — FAQ
Why is my wave petunia sparse or stalled bloom?
Almost always under-feeding or too little sun. Wave types are heavy feeders; resume weekly fertiliser and ensure 6+ hours of direct light.
Why is my wave petunia botrytis (grey mould) on flowers?
Brown, mushy petals in cool, wet, crowded conditions. Improve airflow, water at the base, and remove spent blooms promptly.
Why is my wave petunia budworm / tobacco budworm?
Caterpillars bore into buds, leaving holes and shredded petals and stopping flowering. Pick by hand or treat with Bacillus thuringiensis (Bt).
Why is my wave petunia drought wilt?
Baskets dry out fast and wilting hard sets back bloom; keep the rootball evenly moist and never let it bone-dry in heat.