Juglans regia
Common name: 
English Walnut
Persian Walnut
Pronunciation: 
JU-glanz RE-gee-a
Family: 
Juglandaceae
Genus: 
Type: 
Broadleaf
Native to (or naturalized in) Oregon: 
No
  • Broadleaf deciduous tree, 40-60 ft (12-18 m), rounded to open, spreading; grayish bark.  Pith of stem uniformly chambered.  Leaves alternate, pinnately compound, odd number of leaflets, usually 5, 7, or 9, each leaflet 5-15 cm long, terminal generally largest, progressively smaller toward petiole base.   Fruit (nut) 4-5 cm diam., walnut of commerce.  Terminal buds 2-3 times larger than lateral buds.
  • Sun. Prefers a deep, dry, light loamy soil, does not do well in wet or poor soils.
  • Hardy to USDA Zone 5(6)     Native from southern Europe to the Himalayas and China.  There a large number of selections (cultivars) of Juglans regia that are grown commercially throughout the world.  Some cultivars can be grown in Oregon, including: 'Franquette', 'Chandler, 'Carpathian' and 'Hartley'.  In the US, about 99% of all the commercial walnuts are produced in California.
  • Juglans: classical Latin name for Juglans regia, from jovis, of Jupiter, and glans, acorn or nut.     regia: royal
  • Corvallis: on the north side of Orchard St., about 1/2 block east of 30th St.
Click image to enlarge
  • male catkins and female flowers

    male catkins and female flowers

  • plant habit, summer

    plant habit, summer

  • leafy branches

    leafy branches

  • leaves

    leaves

  • leaves and developing fruit

    leaves and developing fruit

  • developing fruit

    developing fruit

  • leaf, comparison

    leaf, comparison

  • plant habit, fall

    plant habit, fall

  • leaves, fall

    leaves, fall

  • fruit and nut, fall

    fruit and nut, fall

  • winter twigs and buds

    winter twigs and buds

  • trunk, bark

    trunk, bark