Troubleshooting
Watermelon problems — and how to fix them
Watermelon (Citrullus lanatus) is generally forgiving once you match its basics, but a few issues come up again and again. Here is what each one looks like, why it happens, and the fix.
Slow ripening
Cold summer; choose early varieties and use black mulch.
Hollow heart
Inconsistent watering during fruit fill.
Anthracnose
Fungal disease in humid weather; rotate crops.
No fruit set
Poor pollination; hand-pollinate or attract bees.
Cracked fruit
Heavy rain after drought.
Prevent watermelon problems before they start
Most watermelon issues are care-mismatch, not bad luck. Dial in the basics:
Watermelon problems — FAQ
Why is my watermelon slow ripening?
Cold summer; choose early varieties and use black mulch.
Why is my watermelon hollow heart?
Inconsistent watering during fruit fill.
Why is my watermelon anthracnose?
Fungal disease in humid weather; rotate crops.
Why is my watermelon no fruit set?
Poor pollination; hand-pollinate or attract bees.
Why is my watermelon cracked fruit?
Heavy rain after drought.