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Filbert

Filbert

Corylus maxima
Filbert (Corylus maxima) is a large deciduous shrub native to southeastern Europe and southwestern Asia, from the Balkans through to Ordu in Turkey, where it has been cultivated for its larger-than-hazelnut edible fruits for millennia. In the garden it doubles as bold structural foliage — especially the wine-purple cultivar 'Purpurea' — making it as much an ornamental as a productive shrub. The honest catch is its sheer bulk and suckering ambition: left unmanaged it rapidly forms an impenetrable multi-stemmed thicket 6–10 m tall, requires another Corylus nearby for worthwhile nut crops, and squirrels reliably harvest the nuts before the gardener does.
Climate fit: narrow (39/100)
Focal point
Edible
Structure
Pollinator
Light
Full sun / Part sun
Water
Moderate water
Mature size
240-396" tall · 144" apart
Hardy in zones
4a-8b
very cold to frosty winters
Native in Illinois
No

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Without a cross-pollinator, nut crops are sparse or absent.

Cold hardiness

These values are location-based: this location's current hardiness is the baseline, and the 2050 value is a projected future climate for this same location.
Now
Zone 6b
Plotwright
USDA Zone 6b
-5°F to 0°F
Well-suited
Zone 7a
Plotwright
0°F to 5°F
Well-suited
In plain terms: This location has cold winters. Its winters are projected to keep warming through 2050.
Well-suited today and still thriving in 2050.

Heat tolerance

Heat tolerance values are location-based too: heat days today are observed at this site, and the 2050 value projects this same location under a future climate.
Loading AHS heat-zone data for this location...

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Browse lateral options with similar roles, light needs, size, or native-range overlap; these are not filtered for a better climate fit.
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Full sun / Part sun / Part shade
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Climate: moderate
Focal point
Structure
Pollinator
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Full sun / Part sun / Part shade
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Tree
Full sun / Part sun
Moderate water
Zones 6b-9b
Climate: narrow
Focal point
Pollinator
Edible
Structure

Educator packet

Plant packet
Filbert educator packet
Filbert (Corylus maxima) is a large deciduous shrub native to southeastern Europe and southwestern Asia, from the Balkans through to Ordu in Turkey, where it has been cultivated for its larger-than-hazelnut edible fruits for millennia. In the garden it doubles as bold structural foliage — especially the wine-purple cultivar 'Purpurea' — making it as much an ornamental as a productive shrub. The honest catch is its sheer bulk and suckering ambition: left unmanaged it rapidly forms an impenetrable multi-stemmed thicket 6–10 m tall, requires another Corylus nearby for worthwhile nut crops, and squirrels reliably harvest the nuts before the gardener does.
Scientific name
Corylus maxima
Plant type
shrub
Hardiness
4a-8b
Light
full-sun, part-sun
Moisture
moderate
Spacing
144 inches
Classroom prompts
- Which plant traits are observations, and which are care recommendations?
- How would this plant fit change if the garden location moved warmer, colder, wetter, or drier?
- Which source-backed facts would you cite in a lesson handout?
Use the Sources & citations section below for page citation styles and the field-level source list.

Sources & citations

Cite this page
For lesson plans, articles, or research that uses this page. To cite a single upstream fact instead, use its specific source listed below.
Plotwright. (2026, May 17). Filbert (Corylus maxima). Retrieved 2026, June 30, from https://plotwright.com/plants/corylus-maxima
Sources for every fact
Every fact on this page traces to a source. 18 fields cited - 18 source-backed.
RHS Find a Plant
Botanical research database
Backs 17 fields
Identity
Summary
Plant type
Light
Moisture
Hardiness
Heat zone
Size
Spacing
Habit
Design roles
Seasonal interest
Growth stages
Lifecycle
Regional guidance
Success tips
Designer notes
Wikimedia Commons
Photo · CC BY-SA 4.0
Backs 1 field
Image
GBIF
Botanical research database
Wikipedia (ecoregion articles)
Botanical research database