Tomato Leaves Curling Down: What It Means and What to Do
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GardenSays
Best match: Herbicide drift (2,4-D / dicamba). Manageable if you act.
- Best match
- Herbicide drift
- Severity
- Treatable
- Causes checked
- 3
Based on leaves curling downward on the upper leaves with moist soil, the closest match is herbicide drift (2,4-d / dicamba). Confirm it against the actual plant: New growth twists and cups downward with thickened, parallel-veined leaves; often after a neighbor sprayed a lawn.
- This is a symptom-pattern match from your written description, not a lab diagnosis. If the plant is collapsing over days (not weeks), treat it as the worst plausible cause until ruled out.
Do this this week
- 1.Confirm it first: New growth twists and cups downward with thickened, parallel-veined leaves; often after a neighbor sprayed a lawn.
- 2.Nothing reverses it; plants with mild exposure usually grow through it. Don't harvest for a few weeks; find and stop the source.
- 3.Collapsing fast (days, not weeks)? Photograph it and check with your county extension before treating
Calculated result · 3 verified sources · Checked 2026-07-15 · How we decide
Why
What to do: Nothing reverses it; plants with mild exposure usually grow through it. Don't harvest for a few weeks; find and stop the source.
If that doesn't match what you see, work down the list: Broad mite damage (downward-curled, bronzed, brittle new growth; mites invisible without a lens.); Overwatering (whole-plant downward droop with wet soil; leaves feel limp, not brittle.).
- A symptom tree ranks causes by how well your conditions match each cause's known pattern — the distinguishing signs are how you confirm it on the actual plant, not a lab result.
- Most leaf problems trace to water, weather, or common leaf-spot fungi; true plant-killers are rarer but worth ruling out first.
When this doesn't apply
- If the plant is collapsing fast (days, not weeks), treat it as the most severe possibility on the list until proven otherwise.
- Multiple symptoms at once usually means the top cause here plus plain stress — fix watering first, then re-check.
How this was calculated
- 1. SymptomSource guidance
Tomato: leaves curling downward — 3 known causes evaluated (extension-sourced)
- 2. Your conditionsCalculated result
Location on plant: upper; soil: moist. Causes whose known pattern matches these conditions rank higher — this narrows the list, it doesn't identify anything.
- 3. 1. Herbicide drift (2,4-D / dicamba)match score 5Calculated result
Distinguishing signs: New growth twists and cups downward with thickened, parallel-veined leaves; often after a neighbor sprayed a lawn.
- 4. 2. Broad mite damagematch score 4Calculated result
Distinguishing signs: Downward-curled, bronzed, brittle new growth; mites invisible without a lens.
- 5. 3. Overwateringmatch score 3Calculated result
Distinguishing signs: Whole-plant downward droop with wet soil; leaves feel limp, not brittle.
Data sources
- University of Minnesota Extension — Growing tomatoes in home gardens (common problems) (checked 2026-07-15)
- UMN Extension — What's wrong with my plant? (tomato diagnostic) (checked 2026-07-15)
- Cornell Vegetables — Disease factsheets (checked 2026-07-15)
What changes this answer
Where on the plant?
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People also ask
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Best match: Herbicide drift (2,4-D / dicamba). Manageable if you act. Calculate yours →
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Water deeply 2× per week, about 1.6 gallons per plant each time. Calculate yours →
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Usually nothing now — wait until when the first fruits reach about 1 inch (golf-ball size) (one catch-up feeding is fine if you never fed at planting). Calculate yours →
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