Pest identification
What's eating my helianthus decapetalus 'flore pleno'?
Aphids
Signs: Dense greenfly or blackfly on shoot tips and leaf undersides in spring, causing curling and honeydew deposits.
Control: Knock off with water or insecticidal soap; introduce ladybugs; pinch out heavily infested shoot tips.
Caterpillars
Signs: Irregular holes to full leaf stripping by moth and butterfly larvae, with frass trails as identification clues.
Control: Hand-pick on small plants; Bt spray for larger infestations; maintain habitat for insect-eating birds.
Slugs and snails
Signs: Crown-level chewing on emerging spring shoots, capable of killing weak new divisions or reducing vigour.
Control: Iron phosphate pellets placed around crowns in late winter; hand-pick at night; grit mulch around plant bases.
Keep helianthus decapetalus 'flore pleno' pest-free
Healthy plants resist pests best. Get the basics right:
- What eats thin-leaved sunflower — the species this cultivar belongs to
- What's wrong with my plant? — the diagnosis apps compared
- Common helianthus decapetalus 'flore pleno' problems & fixes
- Helianthus decapetalus 'Flore Pleno' watering schedule
- Helianthus decapetalus 'Flore Pleno' light requirements
- Full helianthus decapetalus 'flore pleno' care guide
Helianthus decapetalus 'Flore Pleno' pests — FAQ
What is eating my helianthus decapetalus 'flore pleno'?
Helianthus decapetalus 'Flore Pleno', the double thin-leaved sunflower, is susceptible to the same pests as other perennial Helianthus. Aphids colonise new growth in spring and are the most consistent problem. Caterpillars feed on leaves in summer. Slugs damage emerging crowns. Its vigorous spreading habit means healthy plants usually outgrow light pest pressure.
How do I get rid of aphids on helianthus decapetalus 'flore pleno'?
Dense greenfly or blackfly on shoot tips and leaf undersides in spring, causing curling and honeydew deposits. Knock off with water or insecticidal soap; introduce ladybugs; pinch out heavily infested shoot tips.
How do I get rid of caterpillars on helianthus decapetalus 'flore pleno'?
Irregular holes to full leaf stripping by moth and butterfly larvae, with frass trails as identification clues. Hand-pick on small plants; Bt spray for larger infestations; maintain habitat for insect-eating birds.
How do I get rid of slugs and snails on helianthus decapetalus 'flore pleno'?
Crown-level chewing on emerging spring shoots, capable of killing weak new divisions or reducing vigour. Iron phosphate pellets placed around crowns in late winter; hand-pick at night; grit mulch around plant bases.