Troubleshooting
American Hazelnut problems — and how to fix them
American Hazelnut (Corylus americana) 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.
Poor cropping without cross-pollination
Hazelnuts are largely self-incompatible. Plant two or more genetically different seedlings or cultivars nearby so wind-borne pollen sets a full nut crop.
Squirrel and bird raids
Wildlife strips ripening nuts fast, often before they are fully ripe. Harvest promptly as husks brown, or net selected branches if competition is intense.
Eastern filbert blight
Though more resistant than European hazel, it can host this fungal canker disease; remove and destroy cankered stems and avoid planting near infected European filberts.
Excessive suckering
It spreads by root suckers into a thicket. Prune or remove suckers annually to keep it as a tidy shrub rather than a spreading colony.
Prevent american hazelnut problems before they start
Most american hazelnut issues are care-mismatch, not bad luck. Dial in the basics:
Looking for american hazelnut in general rather than its problems? Read the full american hazelnut care guide — light, water, soil and feeding.
American Hazelnut problems — FAQ
Why is my american hazelnut poor cropping without cross-pollination?
Hazelnuts are largely self-incompatible. Plant two or more genetically different seedlings or cultivars nearby so wind-borne pollen sets a full nut crop.
Why is my american hazelnut squirrel and bird raids?
Wildlife strips ripening nuts fast, often before they are fully ripe. Harvest promptly as husks brown, or net selected branches if competition is intense.
Why is my american hazelnut eastern filbert blight?
Though more resistant than European hazel, it can host this fungal canker disease; remove and destroy cankered stems and avoid planting near infected European filberts.
Why is my american hazelnut excessive suckering?
It spreads by root suckers into a thicket. Prune or remove suckers annually to keep it as a tidy shrub rather than a spreading colony.