Pest identification
What's eating my rudbeckia maxima?
Aphids
Signs: Sticky honeydew and distorted new growth; soft-bodied insects visible on stems and under leaves.
Control: Blast off with water; treat heavy infestations with insecticidal soap or neem oil.
Slugs & snails
Signs: Ragged holes in basal leaves in spring and wet periods; silvery slime trails on foliage.
Control: Iron-phosphate pellets, beer traps, or gritty mulch barriers around the crown.
Deer
Signs: Flower heads and upper stems browsed off; significant in rural and suburban gardens.
Control: Deer repellent sprays reapplied after rain, or perimeter fencing in high-pressure areas.
Keep rudbeckia maxima pest-free
Healthy plants resist pests best. Get the basics right:
Rudbeckia maxima pests — FAQ
What is eating my rudbeckia maxima?
Giant coneflower (Rudbeckia maxima) is largely trouble-free but aphids, slugs, and deer are the main threats. Its tall robust stems shrug off many pests, but aphids can colonize fresh growth and deer will browse the imposing flower heads in gardens with high deer pressure.
How do I get rid of aphids on rudbeckia maxima?
Sticky honeydew and distorted new growth; soft-bodied insects visible on stems and under leaves. Blast off with water; treat heavy infestations with insecticidal soap or neem oil.
How do I get rid of slugs & snails on rudbeckia maxima?
Ragged holes in basal leaves in spring and wet periods; silvery slime trails on foliage. Iron-phosphate pellets, beer traps, or gritty mulch barriers around the crown.
How do I get rid of deer on rudbeckia maxima?
Flower heads and upper stems browsed off; significant in rural and suburban gardens. Deer repellent sprays reapplied after rain, or perimeter fencing in high-pressure areas.