Can I use a fungicide for the spots?

You can, but it is usually better to fix the environment first by increasing airflow and keeping the leaves dry. Only use fungicide if the problem persists after those changes.

Are these spots contagious to my other plants?

If the spots are caused by a fungus, they can spread through water droplets or air. It is best to isolate the affected plant until it looks healthy again.

Why are there spots on my Crosswort leaves? Causes and fixes

Check these first

Inspect the undersides of the leaves for tiny bugs.
Check if the leaves are touching other plants.
Ensure the plant has enough space for air to flow.

Likely causes

Fungal leaf spot
Most likely
How to tell: Small brown or black spots appear on the leaves, sometimes with a yellow halo. These spots often grow larger if the plant stays in a humid, stagnant environment.
What to do: Remove the affected leaves immediately to stop the spread. Improve air circulation around the plant and avoid getting water on the foliage when you water.
Aphid damage
Possible
How to tell: You see tiny clusters of insects on the stems or undersides of leaves, often accompanied by sticky residue. The leaves may develop small yellow or brown spots where the aphids have fed.
What to do: Wipe the aphids off with a damp cloth or use a gentle stream of water to wash them away. If the infestation is heavy, apply insecticidal soap according to the label instructions.

Leaf spots on other plants

Find out what's wrong with your crosswort

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

Worry if the spots are spreading quickly or if the leaves are beginning to curl and drop. A single small spot is rarely a major emergency.

Stopping it coming back

Water at the base of the plant to keep leaves dry and ensure your plant has plenty of space for air to circulate.

Crosswort: spots? Check yours with a photo

Every plant is a little different. Take a photo of your crosswort 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

Can I use a fungicide for the spots?: You can, but it is usually better to fix the environment first by increasing airflow and keeping the leaves dry. Only use fungicide if the problem persists after those changes.
Are these spots contagious to my other plants?: If the spots are caused by a fungus, they can spread through water droplets or air. It is best to isolate the affected plant until it looks healthy again.

Why are there spots on my Crosswort leaves?

Check these first

Not sure what's wrong with your crosswort?

Likely causes

Fungal leaf spot

Aphid damage

Find out what's wrong with your crosswort

When to worry

Stopping it coming back

Crosswort: spots? Check yours with a photo

Questions people ask

Guides to these causes

More problems with Crosswort