Corylus
Filbert · also Hazel, Hazelnut, American hazelnut
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Corylus are deciduous trees and large shrubs native to the temperate Northern Hemisphere, often found along forest edges and in thickets. They have leaves with double-toothed margins and produce red, sticky-glanded fruits. Hazels provide value to wildlife, especially squirrels.
Where it grows
Trees in each city's inventory, with the share of that city's named trees this species accounts for.
- 3140.03%—2.6 in
- 340.01%20 yr3.9 in
- 300.00%—3.9 in
- 220.01%——
- 200.01%22 yr9.9 in
- 190.01%2.4 yr0.4 in
- 170.05%—4.7 in
- 140.03%——
- 130.01%—5.0 in
- 130.01%12 yr16 in
- 120.01%—12 in
- 60.04%—3.9 in
- 20.00%—12 in
- 20.00%—1.8 in
- 10.00%—4.0 in
- 10.00%——
Traits
- Form
- Broadleaf
- Foliage
- Deciduous
- Mature height
- 10–15 ft
- Canopy spread
- 7–15 ft
- Growth rate
- Moderate
- Wildlife value
- Moderate
- Blooms
- Mar, Apr, May
Trunk diameters across every city: median 2.6 in, mean 4.8 in, 90th percentile 7.9 in. Measured at breast height, as published by each inventory.
Native range
Terrestrial ecoregions where this species is native. Trees in the dataset mostly stand well outside it.
Temperate Broadleaf & Mixed Forests
- Eastern Canadian Forest-Boreal transition
- Western Great Lakes forests
- Balkan mixed forests
- Caucasus mixed forests
- Eastern Anatolian deciduous forests
Temperate Conifer Forests
- Elburz Range forest steppe
Montane Grasslands & Shrublands
- Kuh Rud and Eastern Iran montane woodlands
Other Corylus in the catalogue
7 of the top 2,000 species are in this genus.
