Cracks Inside a Watermelon? Here’s What They May Mean

You cut open a watermelon expecting to find juicy, bright-red flesh, but instead you discover cracks, splits, or hollow-looking spaces inside. It can be surprising—and you may immediately wonder whether the watermelon is safe to eat.

The good news is that cracks inside a watermelon do not always mean the fruit has gone bad. Internal cracks can happen for several reasons, including the way the watermelon grew, changes in water availability, temperature conditions, or natural characteristics of the fruit.

However, not every unusual-looking watermelon should be eaten. The smell, texture, color, and overall condition of the flesh are important clues when deciding whether the fruit is still fresh.

In this article, we’ll explain why watermelons can develop cracks inside, what different types of internal cracking may indicate, and how to tell the difference between a harmless quality issue and a watermelon that should be discarded.

What Do Cracks Inside a Watermelon Look Like?

Internal cracks can appear in several forms.

You might notice:

• Small cracks running through the red flesh
• Larger splits near the center of the watermelon
• Hollow spaces surrounded by red flesh
• A network of fine cracks
• Sections where the flesh appears separated
• Cracks containing a slightly different texture or color

Some internal cracks are relatively minor and do not significantly affect the flavor. Others can be associated with changes in texture and quality.

Because the appearance alone doesn’t always tell the whole story, it’s important to examine the watermelon carefully before eating it.

Why Does a Watermelon Crack Inside?

1. Rapid Growth

One common explanation for internal cracking is rapid growth.

Watermelons contain a large amount of water, and the fruit expands as it develops. If growth happens quickly, the internal flesh may not develop uniformly. This can contribute to cracks or hollow areas inside the fruit.

This type of cracking can occur even when the watermelon looks perfectly normal from the outside.

A watermelon with internal cracks caused by growth conditions may still be edible if the flesh otherwise looks, smells, and tastes normal.

2. Irregular Water Supply

Water availability during the growing season can influence watermelon development.

If a plant experiences periods of limited water followed by abundant water, the fruit may undergo changes in growth rate. A sudden increase in available water can cause the fruit to expand quickly.

This can contribute to internal structural problems, including cracking.

Farmers carefully manage irrigation because consistent growing conditions can help produce fruit with better texture and appearance.

3. Temperature Fluctuations

Weather conditions can also influence the development of watermelons.

Large changes in temperature can affect plant growth and fruit development. Extremely hot conditions, particularly when combined with inconsistent moisture, can place additional stress on the plant.

Although consumers generally cannot determine exactly what conditions a watermelon experienced while growing, environmental factors can help explain why two watermelons from the same batch may look different inside.

What Is Hollow Heart in a Watermelon?

One condition that can sometimes be confused with internal cracking is called hollow heart.

Hollow heart refers to gaps or hollow spaces that develop inside the watermelon flesh. The fruit may appear relatively normal on the outside, but when cut open, you may discover a cavity or separation near the center.

The exact causes can vary, but rapid or uneven fruit development is one factor associated with this type of internal defect.

Hollow heart is primarily a quality issue rather than an automatic indication that the watermelon is spoiled.

If the flesh surrounding the hollow area is firm, fresh-smelling, and normal in color, the fruit may still be suitable for eating.

Are Cracks Inside a Watermelon Dangerous?

Not necessarily.

An internal crack is not automatically a sign of harmful bacteria or spoilage. Some cracks are simply physical defects that developed while the watermelon was growing.

However, cracks can sometimes affect quality. Once the interior of the fruit is exposed to air, moisture, microorganisms, or contamination, deterioration can occur.

That’s why you should not judge safety based on the cracks alone.

Instead, check the entire watermelon.

How to Tell If a Cracked Watermelon Is Safe to Eat

After cutting a watermelon, inspect the flesh carefully.

Look at the Color

Fresh watermelon flesh is generally vibrant red, pink, or yellow depending on the variety.

Be cautious if you notice unusual discoloration, extensive browning, gray areas, or other signs that the flesh is deteriorating.

A small variation in color does not necessarily mean the fruit is unsafe, but significant changes combined with other spoilage signs are a reason to avoid eating it.

Check the Smell

Fresh watermelon should have a mild, fresh, fruity aroma.

If it smells sour, fermented, rotten, or otherwise unpleasant, it is best not to eat it.

Your sense of smell can be a useful first warning sign when evaluating cut fruit.

Feel the Texture

Fresh watermelon should be juicy and reasonably firm.

If the flesh has become excessively soft, slimy, mushy, or sticky, the fruit may have deteriorated.

Internal cracks themselves can change the texture, but a combination of cracks and slimy or decomposing flesh is more concerning.

Look for Mold

Visible mold is a clear reason to discard the watermelon.

Do not simply cut away a small moldy section and assume the rest is safe. Soft, moist fruits can allow contamination to extend beyond what is visible.

When in doubt, throwing the fruit away is the safer choice.

What If the Watermelon Tastes Strange?

Taste should not be your primary method of determining whether questionable food is safe.

If the watermelon already looks or smells spoiled, don’t taste it to “test” it.

However, if you have eaten a piece and notice a distinctly sour, fermented, or otherwise abnormal flavor, stop eating it and evaluate the fruit.

Fresh watermelon should generally taste sweet, juicy, and refreshing.

An unusual flavor can indicate deterioration or simply poor quality, but either way, there is little reason to continue eating a fruit that seems abnormal.

Can You Eat Around the Cracks?

If the watermelon has internal cracks but the surrounding flesh appears fresh, firm, normally colored, and free from mold or unpleasant odors, the cracks may simply represent a structural defect.

You can remove sections that have poor texture or appearance.

However, if there are widespread signs of spoilage, don’t attempt to salvage the fruit by cutting away individual areas.

When a watermelon has clearly deteriorated, discarding it is the better option.

Why Do Some Watermelons Have More Cracks Than Others?

Watermelons vary naturally in size, structure, growing conditions, and quality.

Even fruits grown on the same farm can experience slightly different conditions. Differences in water availability, temperature, pollination, growth rate, and plant health can influence the final appearance.

This is why one watermelon might have perfectly uniform flesh while another has a few internal cracks.

An unusual appearance does not automatically mean the fruit is unhealthy or unsafe.

Do Seedless Watermelons Get Internal Cracks?

Yes. Seedless watermelons can also develop internal structural defects.

The absence of mature black seeds doesn’t prevent the fruit from experiencing growth-related problems.

You may find hollow areas, cracks, or differences in texture in both seeded and seedless varieties.

Therefore, the presence or absence of seeds isn’t a reliable way to determine whether internal cracking is normal.

What About a Watermelon With a Large Center Crack?

A large crack through the center deserves a closer inspection.

If the flesh remains fresh and firm and there are no signs of spoilage, the crack may be a growth-related defect.

But a large opening can also provide more opportunity for deterioration after the watermelon has been cut.

If the fruit has been stored for an extended period after cutting, or if the cracked area looks wet, slimy, discolored, or otherwise abnormal, it is better to discard it.

How Should You Store Cut Watermelon?

Once a watermelon has been cut, proper storage becomes important.

Keep cut watermelon refrigerated in a clean, covered container. Avoid leaving cut fruit at room temperature for prolonged periods.

Using clean utensils and keeping the fruit protected from other foods can also help reduce the risk of contamination.

If you are unsure how long a cut watermelon has been sitting out or whether it was stored properly, it’s safer not to eat it.

Does Cracking Affect the Taste?

Sometimes it does, and sometimes it doesn’t.

A watermelon with internal cracks may still taste perfectly sweet and juicy. In other cases, the affected areas may have a different texture or seem less appealing.

Hollow areas can make the fruit feel less uniform when you bite into it, but they don’t necessarily mean the watermelon is spoiled.

Taste and texture can vary depending on the cause and severity of the internal defect.

When Should You Throw Away a Watermelon?

You should discard a watermelon if you notice clear signs of spoilage, such as:

• Mold
• A strong rotten or fermented smell
• Slimy or unusually mushy flesh
• Significant discoloration
• Leaking liquid accompanied by other spoilage signs
• An unusual appearance combined with poor storage conditions