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Check these first
- Feel the soil to check for excess moisture.
- Inspect the leaves for small insects or webbing.
- Check if the plant is getting enough direct sunlight.
Likely causes
Overwatering
Most likelyHow to tell: The lower leaves turn yellow and the soil feels soggy or smells swampy.
What to do: Stop watering immediately and let the soil dry out. If the area has poor drainage, consider amending the soil with sand or compost.
Nitrogen deficiency
PossibleHow to tell: Older leaves turn pale yellow while the veins remain green.
What to do: Apply a balanced, slow release fertilizer once during the growing season. Follow the package instructions for the correct amount.
Find out what's wrong with your common ragweed
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
Or go to pocketbotanist.app/get on your phone
When to worry
Yellowing of the very bottom leaves is normal as the plant matures. If the yellowing spreads to the top of the plant, take action.
Stopping it coming back
Ensure the plant is in a spot with well draining soil and full sun exposure.
Common ragweed: yellow leaves? Check yours with a photo
Every plant is a little different. Take a photo of your common ragweed 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.
Scan with your phone's camera to get the app
Or go to pocketbotanist.app/get on your phone
Get the app · Or check it from a photo now, free
Questions people ask
- Is yellowing a sign of a disease?
- It is rarely a disease. It is almost always a reaction to water or soil conditions.
- Can I just cut off the yellow leaves?
- Yes, you can snip them off to keep the plant looking tidy. It will not hurt the plant.
More problems with Common ragweed
- Why is my common ragweed drooping?
- Why does my common ragweed have spots on its leaves?
- Why is my common ragweed looking leggy?
- Why are the tips of my ragweed leaves turning brown?
- Why is my ragweed dropping its leaves?
- Why does my common ragweed have bugs?
- Is my common ragweed suffering from root rot?
- Why are my ragweed leaves curling?
Back to the Common ragweed guide
This article was generated with AI on from the plant’s care profile and is general information, not horticultural advice. Read about how we build these guides.