Tomato problem · Symptom guide
Why are my tomatoes splitting?
Tomatoes often crack after a dry spell ends in heavy rain or a deep watering, when skin cannot stretch with a sudden water uptake. Cultivar and heat play a role. This is a water-pattern issue more often than a pesticide gap.
Healthy foliage for comparison — check your plant's newest growth.
Look
Radial splits from the stem, or concentric rings on the shoulder.
Questions
- Did a dry spell end in heavy rain or a deep watering?
- Are ripe fruit hanging through that swing?
- Thin skins / very large fruit on this plant?
Most likely possibility
Cited observations are comparisons—not a confirmed diagnosis. Check the cited sources and local requirements before taking action.
Save this bed. See it coming next year.
Your checks stay in the Field Book so next season is not a guess.
Common possibility: fruit skin cannot stretch after a sudden water uptake. Cultivar and heat play a role. This is not a pesticide gap.
What to do now
- Check the last days of rain vs irrigation.
- Consider harvesting blush fruit before a forecast dump.
- Monitor new fruit after you even out water.
- Contact local Extension if cracks come with rot that spreads through the plant, not just the fruit.
Prevent
Mulch; even moisture; do not let pots bone-dry. Care.
Other causes
Cultivar and heat play a role. Splits after a dry-then-wet swing are still a water-pattern comparison, not a pesticide gap.
What the sources say — at a glance
One source per card. Facts are not averaged.
Clemson (South Carolina)
Splits when a dry stretch is followed by a hard rain or irrigation, with fruit expanding quickly as it colors.
Details and limits (2)
Pattern
They describe splits when a dry stretch is followed by a hard rain or irrigation, with fruit expanding quickly as it colors.
Limit
Clemson disorders sheet. Water-pattern comparison — not a pesticide gap.
Iowa State Extension (Iowa)
Cracking tied to big swings in soil moisture, including a deep watering after a dry stretch. Cracks at the stem end; some radial, some rings.
Details and limits (3)
Pattern
They tie cracking to big swings in soil moisture, including a deep watering after a dry stretch.
Pattern
They describe cracks at the stem end; some run out from the stem, others circle the fruit in rings. Pattern comparison only — not a diagnosis and not a named disease.
Limit
Iowa disorders page. Not a confirmed cause for a given fruit.
UGA C1089 (Georgia)
Fruit cracking when tomatoes absorb too much moisture at one time. Splits as concentric rings or star-shaped around the stem.
Details and limits (5)
Pattern
They describe fruit cracking when tomatoes absorb too much moisture at one time. Red pattern comparison only — not a confirmed cause and not a treatment.
Pattern
They describe splits as concentric rings or star-shaped splits around the stem. Pattern comparison only — not a diagnosis and not a named disease.
Pattern
They list drought followed by heavy rain, or irrigation they call poor, among conditions with this look. Cultural context only — not a confirmed cause and not a product.
Pattern
They describe fruit swelling and splitting from the pressure of too much moisture at one time. Red pattern comparison only — not a confirmed cause and not a treatment.
Limit
Georgia C1089. Not a soil prescription.
UNH Extension (New Hampshire)
Too much water at one time may cause ripening fruit to split. Pattern comparison — not a confirmed cause or treatment.
Details and limits (2)
Pattern
They note that too much water at one time may cause ripening fruit to split. Red pattern comparison only — not a confirmed cause and not a treatment.
Limit
New Hampshire tomato sheet only.
Utah State Extension (Utah)
Severe root or vine pruning among conditions that increase cracking. Some varieties more prone — not a cultivar ranking.
Details and limits (3)
Culture
They list severe root or vine pruning among conditions that increase cracking. Cultural context only — not a cause of splitting from a photo and not a cut list.
Types
They note some varieties are more prone to cracking than others. Not a cultivar ranking and not a SKU.
Limit
Utah garden tomato page only.
Cornell (New York)
Keep soil evenly moist; cracking when fruit absorbs water too fast after heavy rain following dry conditions.
Details and limits (2)
Culture
They list keeping soil evenly moist with cracking when fruit absorbs water too fast after heavy rain following dry conditions. Cultural context only — not a treatment and not a BioArva watering schedule. Red pattern comparison only — not a confirmed cause and not a soil prescription.
Limit
New York tomato guide only.
Make it yours
Save the bed in the Field Book so next season is not a guess.
What can I check when tomatoes split?
Check recent rain versus irrigation. Clemson and Iowa State notes on this page are source context, not a treatment. This page does not sell a spray.
How we know — methodology. Ranges and assertions are cited per source, not blended.