Troubleshooting
Trazel problems — and how to fix them
Trazel (Corylus × colurnoides) 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.
Pollination requirements
Like other hazels it is largely self-incompatible; plant a compatible pollinating hazel nearby for reliable nut set.
Squirrel and weevil losses
Squirrels and nut weevil take and damage maturing nuts, reducing the harvest if unprotected.
Slow early establishment
As a tree-form hazel it can be slower to settle and begin heavy cropping than bushy cobnut types.
Variable hybrid vigour
Being a hybrid of garden origin, individual plants vary in nut size and yield; source from a reputable named selection.
Prevent trazel problems before they start
Most trazel issues are care-mismatch, not bad luck. Dial in the basics:
Looking for trazel in general rather than its problems? Read the full trazel care guide — light, water, soil and feeding.
Trazel problems — FAQ
Why is my trazel pollination requirements?
Like other hazels it is largely self-incompatible; plant a compatible pollinating hazel nearby for reliable nut set.
Why is my trazel squirrel and weevil losses?
Squirrels and nut weevil take and damage maturing nuts, reducing the harvest if unprotected.
Why is my trazel slow early establishment?
As a tree-form hazel it can be slower to settle and begin heavy cropping than bushy cobnut types.
Why is my trazel variable hybrid vigour?
Being a hybrid of garden origin, individual plants vary in nut size and yield; source from a reputable named selection.