Juglans regia
Common walnut · also English walnut, Persian walnut, Carpathian walnut
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Juglans regia, also known as English or Persian walnut, is a species with a large, spreading crown and fragrant leaves that produces edible walnuts. Native to Eurasia, it is widely cultivated in temperate regions and attracts birds and squirrels. It shows resistance to crown rot but can be affected by blackline disease when grafted and by aphids.
Where it grows
Trees in each city's inventory, with the share of that city's named trees this species accounts for.
- 1,4120.12%—2.6 in
- 1,3920.30%36 yr18 in
- 7520.17%33 yr10 in
- 6770.24%12 yr5.9 in
- 1920.03%—9.4 in
- 980.04%—6.3 in
- 890.05%—8.0 in
- 470.10%7.8 yr—
- 460.01%—10 in
- 410.12%—5.9 in
- 310.01%—6.7 in
- 250.03%—5.5 in
- 200.13%—13 in
- 110.00%—3.0 in
- 100.01%—12 in
- 70.01%—1.6 in
- 60.07%——
- 50.00%23 yr50 in
- 50.00%1.7 yr1.5 in
- 40.00%—2.8 in
- 30.00%—21 in
- 10.00%—20 in
- 10.00%—2.0 in
- 10.01%—12 in
Traits
- Form
- Spreading
- Foliage
- Deciduous
- Mature height
- 50 ft
- Canopy spread
- 50–60 ft
- Water needs
- Moderate
- Drought tolerance
- Moderate
- Wildlife value
- High
- Blooms
- Mar, Apr, May
Trunk diameters across every city: median 7.5 in, mean 10 in, 90th percentile 19 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
- Western Himalayan broadleaf forests
- Caucasus mixed forests
Temperate Conifer Forests
- Western Himalayan subalpine conifer forests
- Elburz Range forest steppe
Other Juglans in the catalogue
12 of the top 2,000 species are in this genus.
