Climax
May 27, 2026

What Could These Cracks Inside a Watermelon Indicate?

You cut open a watermelon and saw cracks?

Stop eating it immediately! Here's what it means!

Watermelon is made up of more than 90 percent water. During its growth, the fruit expands rapidly, especially during periods of favorable weather. If environmental conditions change suddenly, the inside of the watermelon can grow at a different rate than the outer rind. When this happens, stress develops within the fruit, and small cracks or hollow spaces can form in the flesh.

One of the most common causes of internal cracking is uneven watering. For example, if a watermelon experiences a dry period followed by heavy rainfall or excessive irrigation, the fruit may absorb water very quickly. The flesh expands faster than the surrounding tissues can accommodate, leading to internal splitting. Farmers often see this phenomenon after sudden weather changes during the growing season.

Temperature fluctuations can also contribute to cracking. Watermelons thrive in warm, stable conditions. When temperatures swing dramatically between hot days and cool nights, growth patterns may become irregular. The fruit continues developing, but some sections expand more rapidly than others, creating stress that eventually leads to internal fractures.

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Another factor is rapid growth caused by ideal growing conditions. Ironically, a watermelon growing exceptionally well can sometimes develop cracks simply because the flesh is expanding too quickly. This is especially common in large varieties that gain size rapidly during the final stages of development.

Pollination issues may also play a role. Watermelon flowers require pollination to produce properly formed fruit. If pollination is incomplete, some areas of the fruit may develop unevenly. This can create internal gaps, cracks, or hollow regions that become noticeable when the watermelon is cut open.

Certain watermelon varieties are naturally more prone to internal cracking than others. Plant breeders select different traits such as sweetness, size, color, and disease resistance. Some varieties develop hollow hearts or internal separations more frequently, even when grown under ideal conditions.

One condition commonly associated with cracked watermelon flesh is known as "hollow heart." Hollow heart occurs when a cavity develops inside the fruit. Sometimes the cavity appears as a simple open space. In other cases, surrounding flesh may separate into visible cracks radiating outward from the center. Although the appearance may be surprising, hollow heart is generally considered a quality issue rather than a food safety concern.

Many consumers mistakenly believe that cracks indicate the use of growth hormones. In reality, there is little evidence supporting the widespread claim that internal watermelon cracks result from hormone injections. Commercial watermelon production relies primarily on traditional agricultural practices, irrigation management, soil nutrition, and selective breeding. The dramatic social media stories about injected chemicals often lack scientific support.

That said, seeing cracks does not automatically mean every watermelon is safe. The appearance of the flesh should always be evaluated carefully. Fresh watermelon flesh should look vibrant, juicy, and firm. If cracks are present but the fruit smells fresh and appears normal, it is often still edible. However, certain warning signs should not be ignored.

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An unpleasant odor is one of the clearest indicators that a watermelon has spoiled. Fresh watermelon has a mild, sweet aroma. If you detect a sour, fermented, alcoholic, or rotten smell, microbial growth may be occurring. In such cases, the fruit should be discarded regardless of whether cracks are present.

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