Should I cut off all the spotted leaves?

Yes, removing infected foliage helps reduce the number of spores in the area. Just be sure to dispose of them in the trash, not your compost.

Is this disease permanent?

No, it is seasonal. If you manage the environment, the plant should return healthy next spring.

Red trillium: spots, causes and fixes

Check these first

Examine the spots for fungal growth or fuzzy textures.
Check if the soil is too wet or too dry.
Ensure the plant has enough space from other foliage.

Likely causes

Fungal leaf spot
Most likely
How to tell: You will see dark, circular, or irregular spots on the leaves, sometimes with a yellow halo. These spots may grow and merge as the infection spreads.
What to do: Remove and destroy any infected leaves to stop the spread. Improve air circulation by thinning out nearby plants and avoid overhead watering.
Water stress
Possible
How to tell: Irregular brown or black spots can appear if the soil dries out too much or stays soggy for too long. The edges of the leaves may also look brittle.
What to do: Adjust your watering to keep the soil consistently moist but not waterlogged. Aim for a 5 to 10 day cycle depending on your local rainfall.

Leaf spots 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

If the spots are spreading rapidly and covering most of the leaf surface, the plant will struggle to photosynthesize. Minor spotting at the end of the season is normal as the plant goes dormant.

Stopping it coming back

Water at the base of the plant to keep leaves dry. Ensure your trillium is planted in a spot with good natural airflow.

Red trillium: spots? 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

Should I cut off all the spotted leaves?: Yes, removing infected foliage helps reduce the number of spores in the area. Just be sure to dispose of them in the trash, not your compost.
Is this disease permanent?: No, it is seasonal. If you manage the environment, the plant should return healthy next spring.

Guides to these causes

Leaf Spot

Why does my Red trillium have spots on its leaves?

Check these first

Not sure what's wrong with your red trillium?