What Causes Watermelon Spoilage?

If you’ve ever sliced into a watermelon only to find an unexpected texture, color, or odor, you’re not alone. Watermelons can sometimes harbor internal issues that aren’t visible from the outside. Understanding these problems can help you determine whether your watermelon is safe to eat or should be discarded.

Common Causes of Watermelon Spoilage

1. Overripeness and Internal Breakdown

An overripe watermelon may exhibit a mealy texture, graininess, or cavities around the seeds. While the taste might be unappealing, it’s generally safe to consume if there’s no sign of mold or fermentation.
Read more from Southern Living.

2. Fungal and Bacterial Infections

Watermelons are susceptible to several pathogens that can cause spoilage, including:

Fusarium Wilt: Caused by Fusarium oxysporum, this disease leads to internal decay.
Learn more on FrontiersIn.org.
Bacterial Fruit Blotch: Results in dark lesions and internal cracking.
Purdue University’s overview.
Anthracnose: Characterized by sunken, dark spots on the rind and flesh.
Cornell University’s vegetable guide.

3. Fermentation

Improper storage can lead to fermentation, which causes a sour smell and fizzy texture. This makes the watermelon unsafe to eat.
See details from Keep Food Safe.

4. Sunscald

Direct exposure to sunlight can cause sunscald, leading to discolored patches and flesh breakdown.
Read more from University of Delaware.

Is It Safe to Eat?

Discard the watermelon if you notice any of the following signs:

Mold: Any visible mold indicates spoilage.
Tasting Table’s warning signs.
Off Odor: A sour, rotten, or fermented smell is a clear indicator it’s unsafe.
Discoloration: Unusual colors, particularly near the rind, may signal internal decay or bacterial presence.

Beware of Foaming Watermelons

Tips for Selecting and Storing Watermelon

Choosing: Select watermelons with a uniform shape, a creamy yellow field spot, and a deep hollow sound when tapped.
Storage: Whole watermelons should be kept at room temperature. Once cut, refrigerate in an airtight container and eat within 3–5 days.
Southern Living tips.

Creative Uses for Overripe Watermelon

If the watermelon is overripe but not spoiled, you can still enjoy it in several ways:

Smoothies: Blend with strawberries, bananas, or mint for a refreshing drink.
Sorbet: Freeze blended watermelon for a simple summer treat.
Pickled Rind: Don’t toss the rind—pickle it for a crunchy, tangy snack.

Stay informed, eat smart, and enjoy watermelon the right way!