Will these pests kill my trillium?

Usually not, but they can make the plant look ragged. If they eat all the leaves, the plant cannot store energy for next spring.

Are chemical pesticides safe to use?

Avoid broad spectrum sprays as they harm beneficial insects. Stick to targeted methods like bait or handpicking.

Red trillium: pests, causes and fixes

Check these first

Inspect the undersides of leaves for pests.
Look for shiny slime trails on the soil.
Check the plant at night with a flashlight.

Likely causes

Slugs and snails
Most likely
How to tell: You will see irregular holes in the leaves and shiny slime trails on the foliage or nearby soil. They are most active at night or during damp, overcast weather.
What to do: Handpick them in the early morning or late evening. You can also place shallow containers of beer near the plant to trap them, or use iron phosphate bait around the perimeter.
Foliar insects
Possible
How to tell: Small insects like aphids may cluster on the undersides of leaves, causing minor distortion or yellowing. Look closely for tiny moving specks.
What to do: Spray the foliage with a gentle stream of water to knock them off. If the infestation persists, apply insecticidal soap according to the label instructions.

Pests on other plants

Find out what's wrong with your red trillium

The list above covers the usual causes. Pocket Botanist looks at a photo of your actual plant and tells you the likely cause, how serious it is, and what to try first. Identification and a health check are free.

When to worry

Small holes are usually cosmetic, but heavy feeding that strips the leaves can weaken the plant for next year. If the plant is being defoliated, take action immediately.

Stopping it coming back

Keep the area around your trillium free of debris where slugs hide. Use crushed eggshells or gravel as a physical barrier around the base.

Red trillium: pests? Check yours with a photo

Every plant is a little different. Take a photo of your red trillium and Pocket Botanist tells you which cause is most likely, how serious it is, and what to try first. A few checks a day are free. Save the plant and you get care reminders timed for it.

Get the app · Or check it from a photo now, free

Questions people ask

Will these pests kill my trillium?: Usually not, but they can make the plant look ragged. If they eat all the leaves, the plant cannot store energy for next spring.
Are chemical pesticides safe to use?: Avoid broad spectrum sprays as they harm beneficial insects. Stick to targeted methods like bait or handpicking.

Guides to these causes

Slugs and Snails

Why are there holes in my Red trillium leaves?