Troubleshooting
Cosmos bipinnatus 'Picotee' problems — and how to fix them
Cosmos bipinnatus 'Picotee' (Cosmos bipinnatus 'Picotee') 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.
Leggy, flopping stems
Shade, rich soil or over-feeding makes plants tall and weak. Grow in full sun and lean soil, pinch early and provide staking or support.
Excess foliage, few flowers
Caused by over-rich or over-fed soil. Plant in poor, free-draining soil and withhold fertiliser to encourage bloom.
Aphids
Soft new growth attracts aphids on shoots and buds. Use a strong water spray or insecticidal soap.
Powdery mildew
Crowding and damp conditions encourage mildew on foliage. Space plants well, water at the base and improve airflow.
Prevent cosmos bipinnatus 'picotee' problems before they start
Most cosmos bipinnatus 'picotee' issues are care-mismatch, not bad luck. Dial in the basics:
- Common cosmos problems — the species this cultivar belongs to
- What's wrong with my plant? — the diagnosis apps compared
- Cosmos bipinnatus 'Picotee' watering schedule
- Cosmos bipinnatus 'Picotee' light requirements
- Best soil mix for cosmos bipinnatus 'picotee'
- Cosmos bipinnatus 'Picotee' temperature & humidity
- Full cosmos bipinnatus 'picotee' care guide
Looking for the species overview? Cosmos — the full care guide.
Cosmos bipinnatus 'Picotee' problems — FAQ
Why is my cosmos bipinnatus 'picotee' leggy, flopping stems?
Shade, rich soil or over-feeding makes plants tall and weak. Grow in full sun and lean soil, pinch early and provide staking or support.
Why is my cosmos bipinnatus 'picotee' excess foliage, few flowers?
Caused by over-rich or over-fed soil. Plant in poor, free-draining soil and withhold fertiliser to encourage bloom.
Why is my cosmos bipinnatus 'picotee' aphids?
Soft new growth attracts aphids on shoots and buds. Use a strong water spray or insecticidal soap.
Why is my cosmos bipinnatus 'picotee' powdery mildew?
Crowding and damp conditions encourage mildew on foliage. Space plants well, water at the base and improve airflow.