Tomato Leaves Turning Yellow
Tomato yellowing is often a stress signal, not an instant sign that the plant is finished.
Look at which leaves changed first, how long the soil stays wet, and whether the plant recently faced cold nights or transplant shock. Those clues usually tell you more than the color alone.
Next Move
Use the calendar when the real problem is timing or weather.
If the yellowing followed cold weather or a wet stretch, compare your recent lows and planting window in the calendar before changing fertilizer or spraying anything.
Check the pattern before you treat the plant
Keep the troubleshooting sequence simple: compare what you can see, rule out the most common causes, and choose the lowest-risk next step first.
Check First
- Whether the oldest lower leaves yellowed first or the newest growth is paling too.
- How damp the soil stays a full day after watering or rain.
- Whether the plant was transplanted recently or hit a stretch of chilly nights.
Likely Causes
- Overwatering that leaves roots slow, pale, and oxygen-starved.
- Normal lower-leaf aging while the rest of the plant still looks vigorous.
- Transplant stress or cool weather slowing nutrient uptake for a week or two.
- Underfed container plants that have already used up the mix.
What To Do This Week
- Let the top layer of soil dry slightly before watering again.
- Remove only fully yellowed leaves so the plant keeps useful foliage.
- Feed lightly if the plant is actively growing and the potting mix is exhausted.
- Protect from another cold snap before making bigger changes.
Keep troubleshooting from the right starting point
If this was not the exact symptom you meant, jump back to the hub or compare it with the other common problem guides.
All Garden Problems
Return to the main troubleshooting hub to compare the quick triage and all four featured problem guides.
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