Troubleshooting
Atlantic Giant Pumpkin problems — and how to fix them
Atlantic Giant Pumpkin (Cucurbita maxima) 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.
Fruit splitting or cracking
Caused by rapid, uneven growth — typically triggered by a surge in watering or heavy rain after a dry period. Maintain the most consistent irrigation possible once fruit exceeds 50 kg (110 lb). Use shade cloth in extreme heat to slow growth rate.
Powdery mildew
Almost universal by late season due to the enormous leaf canopy. Apply preventive sulfur or potassium bicarbonate fungicide sprays from midsummer. Remove heavily infected leaves, but retain enough healthy canopy to fuel fruit growth.
Vine borer and squash bugs
Squash vine borers (North America) and squash bugs both threaten the large vines. Bury secondary vines at nodes to create backup root systems. Check vine bases for frass and squash bug egg masses weekly. Row fabric in the earliest weeks provides protection.
Prevent atlantic giant pumpkin problems before they start
Most atlantic giant pumpkin issues are care-mismatch, not bad luck. Dial in the basics:
Looking for atlantic giant pumpkin in general rather than its problems? Read the full atlantic giant pumpkin care guide — light, water, soil and feeding.
Atlantic Giant Pumpkin problems — FAQ
Why is my atlantic giant pumpkin fruit splitting or cracking?
Caused by rapid, uneven growth — typically triggered by a surge in watering or heavy rain after a dry period. Maintain the most consistent irrigation possible once fruit exceeds 50 kg (110 lb). Use shade cloth in extreme heat to slow growth rate.
Why is my atlantic giant pumpkin powdery mildew?
Almost universal by late season due to the enormous leaf canopy. Apply preventive sulfur or potassium bicarbonate fungicide sprays from midsummer. Remove heavily infected leaves, but retain enough healthy canopy to fuel fruit growth.
Why is my atlantic giant pumpkin vine borer and squash bugs?
Squash vine borers (North America) and squash bugs both threaten the large vines. Bury secondary vines at nodes to create backup root systems. Check vine bases for frass and squash bug egg masses weekly. Row fabric in the earliest weeks provides protection.