Pest identification
What's eating my cinnamon fern?
Spider mites
Signs: Fine webbing on frond undersides; stippled or bronzed frond surfaces; fronds drop prematurely in severe infestations
Control: Boost humidity with regular misting or a humidifier; spray insecticidal soap or diluted neem oil weekly; rinse fronds
Aphids
Signs: Clusters of soft green or black insects on unfurling fronds; sticky honeydew; distorted new growth
Control: Knock off with a strong water spray; apply insecticidal soap; introduce predatory insects if outdoors
Fungus gnats
Signs: Larvae damage fine roots in saturated compost; adults swarm around the pot; plant growth slows
Control: Reduce overwatering; use yellow sticky traps; apply Bti (Bacillus thuringiensis israelensis) drench to soil
Keep cinnamon fern pest-free
Healthy plants resist pests best. Get the basics right:
Cinnamon Fern pests — FAQ
What is eating my cinnamon fern?
Cinnamon Fern (Osmunda cinnamomea) grown as a houseplant faces primarily aphids on new fronds and spider mites in dry indoor air. Fungus gnats breed in the consistently moist soil this fern needs. Outdoors or in cool rooms, slugs and snails may damage emerging croziers. Spider mites are the most common indoor threat.
How do I get rid of spider mites on cinnamon fern?
Fine webbing on frond undersides; stippled or bronzed frond surfaces; fronds drop prematurely in severe infestations Boost humidity with regular misting or a humidifier; spray insecticidal soap or diluted neem oil weekly; rinse fronds
How do I get rid of aphids on cinnamon fern?
Clusters of soft green or black insects on unfurling fronds; sticky honeydew; distorted new growth Knock off with a strong water spray; apply insecticidal soap; introduce predatory insects if outdoors
How do I get rid of fungus gnats on cinnamon fern?
Larvae damage fine roots in saturated compost; adults swarm around the pot; plant growth slows Reduce overwatering; use yellow sticky traps; apply Bti (Bacillus thuringiensis israelensis) drench to soil