Hazelnuts Corylus

Common filbert, the most-studied member of Corylus, and American hazelnut each have substantial assessment behind their fire-resistant ratings. Turkish hazelnut is also rated resistant. Beaked hazelnut lands on the resistant side on a handful of assessments, although FireSmart BC has flagged it as needing more research. Its rating is favorable, but less settled than the support for common filbert or American hazelnut.

Common filbert’s rating includes a qualitative garden-suitability method that combines fire evidence with fuel structure, maintenance, and species-specific care. That makes it a broader landscape judgment rather than a simple measurement of how readily plant material ignites. The American hazelnut description identifies it as a native shrub at lower elevations, but gives no mechanism explaining its rating.

Corylus belongs to the Betulaceae family and is grown as shrubs and trees. Among four measured members, mature height runs from about 6 to 25 feet, while two zoned members span USDA zones 2a to 5a. Those details do not show which forms received which ratings. The sound conclusion is favorable but species-specific: common filbert has the deepest support, while beaked hazelnut still carries an explicit call for further study.