Juglans nigra
Black walnut · also Eastern American black walnut, American walnut, Noyer noir
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Juglans nigra is a large deciduous tree with a tall, straight trunk and a wide, spreading crown, noted for its dark, deeply ridged bark. Native to central and eastern North America, it often grows in riparian zones and mixed woodlands. While its wood is highly valued for lumber and its nuts are edible, its roots produce juglone, an allelopathic substance toxic to some plants, requiring careful consideration for urban planting.
Where it grows
Trees in each city's inventory, with the share of that city's named trees this species accounts for.
- 1,9570.28%—9.4 in
- 1,6310.60%—9.4 in
- 1,1190.49%—8.8 in
- 9700.29%5.3 yr2.0 in
- 7250.97%—15 in
- 7100.22%—7.5 in
- 5270.05%—2.8 in
- 4150.89%—7.9 in
- 3500.47%8.8 yr1.6 in
- 2620.13%—17 in
- 2080.03%—11 in
- 1960.07%23 yr9.8 in
- 1610.10%2.2 yr2.0 in
- 1450.05%—2.4 in
- 1390.17%—3.5 in
- 1330.30%—2.0 in
- 1150.04%—3.0 in
- 1120.06%—18 in
- 1050.02%35 yr15 in
- 920.02%62 yr17 in
- 880.20%14 yr2.4 in
- 530.04%23 yr26 in
- 420.18%—9.8 in
- 350.01%—13 in
- 220.19%2.4 yr2.1 in
- 110.00%—3.9 in
- 110.02%45 yr—
- 90.01%—23 in
- 80.00%1.8 yr2.6 in
- 60.01%17 yr3.9 in
- 60.04%—34 in
- 40.01%—19 in
- 20.02%—11 in
- 10.00%—3.8 in
Traits
- Form
- Spreading
- Foliage
- Deciduous
- Mature height
- 50–80 ft
- Canopy spread
- 70 ft
- Growth rate
- Fast
- 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 23 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
- East Central Texas forests
- Eastern Canadian Forest-Boreal transition
- Mississippi lowland forests
Temperate Grasslands, Savannas & Shrublands
- Central US forest-grasslands transition
- Central Tallgrass prairie
Other Juglans in the catalogue
12 of the top 2,000 species are in this genus.
