The Short Answer (What You Came For)
A watermelon with internal cracks, hollow spaces, or a loose, spongy texture may have been treated with a chemical growth regulator called chlorfenuron (also known as forchlorfenuron or CPPU).
This chemical is used by some farmers to accelerate growth, increase fruit size, and improve yield. It can cause the flesh to develop unevenly, creating cracks and cavities.
While chlorfenuron is approved for use in many countries, some studies have raised concerns about its safety. The European Union has restricted its use, and consumer advocacy groups recommend avoiding watermelons with these internal abnormalities.
The bottom line: If you see cracks, hollow spaces, or a loose, spongy texture, don’t eat it. Return it to the store or discard it.
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