You bring home a fresh watermelon, slice it open, and expect to see juicy, bright-red flesh. But instead, you discover strange cracks, hollow spaces, or splits running through the center.
Is the watermelon spoiled? Is it dangerous to eat? Or is this simply a natural part of how the fruit grows?
The good news is that cracks inside a watermelon do not automatically mean the fruit is unsafe to eat. Some are caused by natural growth patterns, while others may be associated with uneven growth, internal quality problems, or damage.
The important thing is to recognize the difference between harmless internal cracking and signs that the watermelon may be deteriorating.
In this article, you'll learn why watermelons develop cracks, how to assess their freshness, and when it's better to throw one away.
1. Why Does a Watermelon Have Cracks Inside?
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Watermelons grow rapidly under favorable conditions. Their internal structure can sometimes develop cracks or hollow spaces as the fruit develops.
Several factors may contribute to these changes.
Rapid or uneven growth
Watermelons contain a large amount of water, and their tissues expand as the fruit grows. Changes in growing conditions can affect how evenly the flesh develops.
If growth is uneven, the internal flesh may develop cavities or cracks.
Changes in water availability
Fluctuations in soil moisture during cultivation can affect fruit development. Irregular watering, particularly after a dry period, may contribute to cracking in some circumstances.
However, the appearance of cracks alone cannot establish exactly what happened while the watermelon was growing.
Internal tissue development
Some watermelons develop hollow spaces or internal splits as a result of abnormalities in the development of the flesh.
These defects may be visible only after the fruit is cut open, even when the outside looks perfectly normal.
The key point: Internal cracks can be a growing or quality defect rather than evidence of spoilage. You need to examine the flesh and consider how the fruit has been stored before deciding whether it is safe.
2. What Is Hollow Heart in Watermelon?
One possible explanation for large internal gaps is a condition commonly called hollow heart.
Hollow heart is a physiological disorder in which the flesh develops an internal cavity or split. It is associated with abnormalities in fruit development and can be influenced by growing conditions and pollination-related factors.
A watermelon affected by hollow heart may have:
- A crack or cavity near the center.
- Flesh that has separated along an internal line.
- An otherwise normal-looking rind.
- Red flesh surrounding the hollow area.
The condition is primarily a quality issue, not proof that the fruit is contaminated.
If the watermelon is otherwise fresh, has been handled and stored properly, and shows no signs of deterioration, hollow heart alone does not necessarily make it unsafe to eat.
However, a large cavity can affect the fruit's texture and eating quality. Inspect the surrounding flesh rather than assuming every cracked watermelon is suitable for consumption.
3. Are Cracked Watermelons Safe to Eat?
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Whether a cracked watermelon is safe depends on more than the presence of cracks.
A watermelon with a clean internal split may still be edible if it is fresh, was handled hygienically, and has been stored at an appropriate temperature.
Use the following checklist to help assess it.
Signs that are more reassuring
- The flesh has its usual red or pink color, depending on the variety.
- The fruit smells fresh and mildly sweet.
- The flesh is firm and juicy rather than slimy or mushy.
- There is no visible mold.
- The fruit was stored properly and has not been left unrefrigerated for an extended period after cutting.
These signs are reassuring but cannot guarantee the absence of harmful microorganisms.
Signs that mean you should discard it
- Mold is visible on the flesh or inside the cavity.
- The fruit smells sour, fermented, or otherwise unpleasant.
- The flesh has become slimy, unusually mushy, or visibly decomposed.
- There is unexpected bubbling or other evidence of fermentation.
- You suspect the fruit has been contaminated or stored unsafely.
Do not taste watermelon to determine whether it is spoiled. Harmful microorganisms may be present without changing the fruit's smell, appearance, or taste.
When in doubt, throw it out.
4. What If the Cracks Are Deep or the Flesh Looks Unusual?
Not all internal cracks look the same.
A thin split through otherwise normal flesh is different from a large cavity accompanied by discoloration, unusual texture, or signs of deterioration.
If you notice a deep crack, examine the surrounding flesh carefully.
Ask yourself:
- Is the flesh still firm and fresh-looking?
- Is the color consistent with the variety?
- Is there any mold or unusual discoloration?
- Does the fruit smell normal?
- Do you know how long it has been stored and whether it has remained refrigerated after cutting?
If the fruit has an unusual appearance and you cannot determine whether it is fresh, the safer option is to discard it.
Also remember that some watermelon varieties have naturally different flesh colors and textures. Color alone should not be used to diagnose a problem.
5. What About Watermelons With Cracks on the Outside?
External cracks are a separate concern.
A watermelon with a split rind may have been damaged during growth, handling, transport, or storage. Once the protective rind is broken, microorganisms can potentially enter the fruit.
If you find a watermelon with a deep or open crack in the rind, especially one sold unrefrigerated or with an uncertain storage history, avoid eating it.
A small superficial mark is not necessarily the same as an open split, but consumers generally cannot reliably determine how much contamination may have occurred.
For that reason, choosing an intact watermelon is the safer approach.
6. Can a Cracked Watermelon Make You Sick?
Yes