College of Agriculture, Health and Natural Resources

Plant Database

Juglans nigra

Black Walnut

Juglandaceae

Black WalnutBlack WalnutBlack WalnutBlack WalnutBlack WalnutBlack WalnutBlack WalnutBlack WalnutBlack WalnutBlack WalnutBlack WalnutBlack WalnutBlack WalnutBlack Walnut
Expand

Habitat

  • native from New England down through Texas
  • hardy to zone 4

Habit and Form

  • large deciduous tree
  • 50' to 75' tall
  • oval, open crown
  • coarse texture
  • medium growth rate

Summer Foliage

  • alternate leaf arrangement
  • pinnately compound leaves
  • one foot to two feet long
  • up to 23 leaflets
  • leaflets are up to 5" long
  • leaflets are serrated
  • dark green leaf color
  • leaves emit odor when crushed

Autumn Foliage

  • yellow fall color

Flowers

  • monoecious
  • male flowers are catkins, small scaley, cone-like buds
  • female flowers are up to 8-flowered spikes
  • not ornamentally important

Fruit

  • fruit is a nut
  • semi-fleshy covering green changing to black and breaking open
  • seeds are edible and oily

Bark

  • dark brown to grayish black
  • deep narrow furrows
  • diamond-shaped pattern
  • stout stems
  • bitter tasting

Culture

  • difficult to transplant
  • prefers moist, well-drained soil, rich and deep soil
  • full sun

Landscape Use

  • for food
  • for fruit
  • lawn trees
  • parks and wide open spaces

Liabilities

  • fruits can be messy

ID Features

  • large pinnately compound leaves with numerous leaflets
  • downy, terminal buds, 0.33" long
  • stout stems
  • leaves emit odor
  • fruit is a nut

Propagation

  • by seed

Cultivars/Varieties

'Laciniata' - This is a rare form with leaflets that are fern-like and dissected with fine texture.

© Copyright Mark H. Brand, 1997-2015.

The digital materials (images and text) available from the UConn Plant Database are protected by copyright. Public use via the Internet for non-profit and educational purposes is permitted. Use of the materials for profit is prohibited.

Citation and Acknowledgements: University of Connecticut Plant Database, https://plantdatabase.uconn.edu/, Mark H. Brand, Department of Plant Science and Landscape Architecture, Storrs, CT 06269-4067 USA.