Why Tomatoes Have Black Spots

Black spots on tomatoes are a common problem and can appear on the fruit, leaves, or stems. The cause isn’t always the same — black spots can result from watering issues, fungal diseases, nutrient problems, or physical damage. Identifying where the spots appear and how they look is the key to fixing the problem and protecting the rest of your crop.

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Where Are the Black Spots Appearing?

Before treating the issue, check which part of the plant is affected, as this usually reveals the cause.

• On the bottom of the fruit: Often blossom end rot
• On leaves: Usually fungal disease or nutrient stress
• On the fruit skin: Can be cracking, rot, or disease
• On stems: Often disease-related or physical damage

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1. Blossom End Rot (Most Common Cause on Fruit)

If black spots appear on the bottom (blossom end) of the tomato:

What it looks like:

• Dark brown or black patch
• Sunken, leathery texture
• Starts firm, then softens

Cause:

• Irregular watering
• Not a disease
• Calcium transport issue, not calcium deficiency

What to do:

• Water consistently
• Mulch to stabilise moisture
• Remove affected fruit
• New fruit is usually unaffected once watering improves

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2. Fungal Diseases (Common on Leaves and Fruit)

Early Blight

Symptoms:

• Dark brown or black spots on leaves
• Yellowing around the spots
• Lower leaves affected first

Cause:

• Damp conditions
• Poor airflow

Fix:

• Remove affected leaves
• Improve airflow
• Avoid wetting foliage

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Late Blight

Symptoms:

• Dark, oily-looking patches
• Rapid spread in cool, wet weather
• Fruit may develop dark, hard patches

Cause:

• Cool, humid conditions

Fix:

• Remove infected plants immediately
• Harvest usable fruit at once
• Do not compost infected material

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3. Overripe or Damaged Fruit

Black spots can appear when tomatoes are left too long on the plant.

What it looks like:

• Soft black patches
• Often around cracks or splits

Cause:

• Overripeness
• Rain after dry weather
• Fruit splitting and rotting

What to do:

• Harvest tomatoes earlier
• Pick as soon as fruit fully colours
• Use affected fruit immediately if still sound

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4. Sunscald Turning Dark

Sunscald doesn’t always stay pale.

Symptoms:

• Pale or yellow patch that later turns dark
• Often on exposed fruit

Cause:

• Too many leaves removed
• Sudden exposure to strong sun

Fix:

• Avoid heavy leaf removal
• Leave some foliage to shade fruit

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5. Bacterial Spot or Speck

Less common, but possible.

Symptoms:

• Small black dots on fruit skin
• Often slightly raised
• Leaves may also be affected

Cause:

• Bacterial infection
• Wet foliage and poor hygiene

Fix:

• Remove affected fruit
• Improve airflow
• Avoid overhead watering

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6. Nutrient Stress or Root Problems

Stress can cause dark patches on fruit or leaves.

Causes include:

• Waterlogged soil
• Compacted roots
• Inconsistent feeding

Fix:

• Improve drainage
• Avoid overfeeding
• Keep watering steady

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Are Tomatoes with Black Spots Safe to Eat?

It depends on the cause.

✅ Safe if:

• Spots are from blossom end rot (cut away affected area)
• Minor cracking with no mould

❌ Not safe if:

• Mould is present
• Fruit is soft, slimy, or smells bad
• Disease is spreading rapidly

When in doubt, discard the fruit.

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How to Prevent Black Spots on Tomatoes

• Water consistently
• Mulch to stabilise moisture
• Avoid wetting leaves
• Improve airflow and spacing
• Harvest fruit promptly
• Avoid heavy pruning in hot weather

Prevention is always easier than cure.

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Common Mistakes That Make It Worse

• Overwatering after drought
• Letting plants dry out completely
• Removing too many leaves
• Leaving ripe fruit on plants too long
• Ignoring early symptoms

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Final Thoughts

Black spots on tomatoes can look alarming, but most causes are manageable once identified. In many cases — especially blossom end rot — the plant itself is healthy, and simple changes to watering and care will prevent the problem from returning.

Check where the spots appear, act quickly, and focus on consistent care. With the right response, the rest of your tomato crop can remain productive and healthy.

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