The Morton Arboretum
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Northern red oak

Quercus rubra

Common names:
northern red oak, red oak

Content Detail

Northern red oak is a Midwest native and is one of the faster growing oaks for the home landscape. The leaves are handsome throughout the year, emerging pinkish-red, turning lustrous dark green in summer, and changing to russet-red to bright red in autumn. Its tolerance of salt and air pollution makes it a good tree for more exposed areas.

This species is native to the Chicago Region according to Wilhelm and Rericha’s Flora of the Chicago Region.

  • Family (English) Beech; Oak
  • Family (botanic) Fagaceae
  • Planting site City parkway, Residential and parks, Wide median
  • Tree or plant type Tree
  • Foliage Deciduous (seasonally loses leaves)
  • Native locale Chicago area, Illinois, North America
  • Size range Large tree (more than 40 feet)
  • Mature height 60-75 feet
  • Mature width 60-75 feet
  • Light exposure Full sun (6 hrs direct light daily), Partial sun / shade (4-6 hrs light daily)
  • Hardiness zones Zone 3, Zone 4, Zone 5 (Northern Illinois), Zone 6 (City of Chicago), Zone 7
  • Soil preference Acid soil, Moist, well-drained soil
  • Drought tolerance Tolerant
  • Other tolerances Alkaline soil, clay soil, Dry sites
  • Season of interest early fall, mid fall
  • Flower color and fragrance Inconspicuous
  • Shape or form Round
  • Growth rate Moderate
  • Transplants well Yes
  • Planting considerations Messy fruit/plant parts
  • Wildlife Game birds, Game mammals, Migrant birds, Small mammals
  • Has cultivars Yes
  • More information

     

Size and Form

Northern red oak is a large tree reaching 60 to 75 feet high and wide.

Native Geographic Location and Habitat

Northern red oak is native to eastern and south-central North America. C-value: 5

Pollinators and Wildlife

It attracts game birds, game mammals, migrant birds, and small mammals.

Bark Description

Young trunk and branches are grayish, turning dark gray with age and developing flat-topped ridges. Lower bark can be blocky or furrowed.

Leaf Description

Northern red oak has alternate, simple leaves with seven to 11 lobes. Each lobe has a bristle tip. Leaves have dull dark green upper surface and is slightly paler beneath in summer changing to a russet red to bright red fall color.

Flower Description

Flowers are borne separately on the same tree. Male flowers are hanging catkins, female flowers are tiny spikes in the axils of the new leaves.

Fruit Description

Acorns are medium brown, 3/4 to 1 inch long, and barrel-shaped. The cap is thin and flat, with appressed scales barely enclosing one quarter of the nut.

Plant Care

Northern red oak prefers a well-drained, rich, woodland site. It grows best in sandy, loam soil. This tree is tolerant of air pollution and salt. Prune oaks in the dormant season to avoid attracting beetles that may carry oak wilt.

List of Pests, Diseases, and Tolerances

This tree develops chlorosis symptoms in high pH soils. All oaks are susceptible to oak wilt. Galls and mites are common insect problems, but aren’t harmful. It is tolerant of black walnut toxicity.

Photo Gallery (6)

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