Troubleshooting
Popcorn problems — and how to fix them
Popcorn (Zea mays var. everta 'Strawberry Popcorn') 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.
Kernels won't pop
Almost always insufficient drying. Cobs need a moisture content around 13-14%; cure them in a warm, airy spot for weeks after harvest before testing.
Cross-pollination spoiling type
Pollen from sweetcorn nearby produces starchy, non-popping kernels. Isolate popcorn by distance or timing from other maize.
Mould on ripening cobs
Wet autumns rot cobs left on the plant. Cut and finish drying under cover if weather turns persistently damp.
Short-season failure to ripen
Popcorn needs a long warm season. In cooler regions start early under cover so cobs mature and dry before frost.
Prevent popcorn problems before they start
Most popcorn issues are care-mismatch, not bad luck. Dial in the basics:
Looking for popcorn in general rather than its problems? Read the full popcorn care guide — light, water, soil and feeding.
Popcorn problems — FAQ
Why is my popcorn kernels won't pop?
Almost always insufficient drying. Cobs need a moisture content around 13-14%; cure them in a warm, airy spot for weeks after harvest before testing.
Why is my popcorn cross-pollination spoiling type?
Pollen from sweetcorn nearby produces starchy, non-popping kernels. Isolate popcorn by distance or timing from other maize.
Why is my popcorn mould on ripening cobs?
Wet autumns rot cobs left on the plant. Cut and finish drying under cover if weather turns persistently damp.
Why is my popcorn short-season failure to ripen?
Popcorn needs a long warm season. In cooler regions start early under cover so cobs mature and dry before frost.