Pocket Botanist
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Check these first
- Inspect the undersides of leaves for fuzzy growth.
- Touch the soil to see if it is waterlogged.
- Check if the plant is getting enough sunlight.
Likely causes
Downy mildew
Most likelyHow to tell: You will see yellow patches on the upper leaf surface with fuzzy gray growth underneath. This happens when the leaves stay wet for too long.
What to do: Remove the affected leaves immediately to stop the spread. Improve air circulation around the plants and avoid overhead watering to keep the foliage dry.
Overwatering
Most likelyHow to tell: The leaves turn a pale yellow and the soil feels constantly soggy or muddy. This prevents the roots from getting the oxygen they need.
What to do: Allow the top inch of soil to dry out before watering again. Ensure your container has drainage holes so excess water can escape.
Find out what's wrong with your rocket
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.
Scan with your phone's camera to get the app
When to worry
If the yellowing spreads rapidly across the whole plant, it is likely a fungal infection that requires removal. It is normal for the very bottom, oldest leaves to yellow as the plant matures.
Stopping it coming back
Water at the base of the plant instead of over the leaves, and ensure your soil drains well.
Keep your rocket healthy from here
Save your plant in Pocket Botanist and you get care reminders timed for this plant, plus a care history that shows what worked. Identification and a health check are free.
Questions people ask
- Can I eat yellow arugula leaves?
- It is best to discard them, especially if the yellowing is caused by mildew. They will likely taste bitter or have a poor texture.
- Does yellowing mean I need fertilizer?
- Sometimes, but check for moisture issues first. If the soil is healthy and the plant is pale, a light application of balanced liquid fertilizer can help.
More problems with Rocket
This article was generated with AI from the plant’s care profile and is general information, not horticultural advice. Read about how we build these guides.