Should I cut off the yellow leaves?

Yes, you can snip them off with clean scissors. This keeps the plant looking tidy and helps it focus energy on healthy growth.

Can low light cause yellowing?

Yes, if the plant does not get enough bright indirect light, it may struggle to photosynthesize. Move it to a brighter spot if it looks pale.

Thale cress: yellow leaves, causes and fixes

Check these first

Check the soil moisture with your finger.
Inspect the drainage holes for blockages.
Look for signs of pests on the undersides of leaves.

Likely causes

Overwatering
Most likely
How to tell: The leaves look limp and yellow, often starting from the bottom of the plant. The soil feels soggy to the touch.
What to do: Let the top inch of soil dry out before watering again. Ensure your pot has drainage holes so excess water can escape.
Nutrient deficiency
Possible
How to tell: General yellowing across the plant, often starting with older leaves. Growth may also appear stunted.
What to do: Apply a balanced liquid fertilizer diluted to half strength. Feed once every 2 to 4 weeks during the active growing season.

Yellow leaves on other plants

Find out what's wrong with your thale cress

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

It is normal for the very oldest, lowest leaves to yellow and drop as the plant matures. Worry if the yellowing spreads rapidly to younger leaves.

Stopping it coming back

Maintain a consistent watering rhythm by checking the soil every 2 days. Avoid letting the plant sit in standing water.

Thale cress: yellow leaves? Check yours with a photo

Every plant is a little different. Take a photo of your thale cress 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 the yellow leaves?: Yes, you can snip them off with clean scissors. This keeps the plant looking tidy and helps it focus energy on healthy growth.
Can low light cause yellowing?: Yes, if the plant does not get enough bright indirect light, it may struggle to photosynthesize. Move it to a brighter spot if it looks pale.

Why are my Arabidopsis thaliana leaves turning yellow?