General Plant Information (Edit)
Plant Habit: Tree
Sun Requirements: Full Sun
Water Preferences: Mesic
Dry Mesic
Dry
Soil pH Preferences: Very strongly acid (4.5 – 5.0)
Strongly acid (5.1 – 5.5)
Moderately acid (5.6 – 6.0)
Slightly acid (6.1 – 6.5)
Minimum cold hardiness: Zone 5b -26.1 °C (-15 °F) to -23.3 °C (-10 °F)
Maximum recommended zone: Zone 9b
Plant Height: 35 to 50 feet
Plant Spread: 35 to 50 feet
Leaves: Deciduous
Fruit: Edible to birds
Fruiting Time: Late summer or early fall
Flowers: Inconspicuous
Underground structures: Taproot
Suitable Locations: Street Tree
Uses: Shade Tree
Dynamic Accumulator: K (Potassium)
Wildlife Attractant: Birds
Resistances: Drought tolerant
Pollinators: Wind
Miscellaneous: Tolerates poor soil
Monoecious

Image
Common names
  • Post Oak
  • Oak

Photo Gallery
Location: Fairfax, VA | September, 2023
Date: 2023-09-27
Abaxial side
Location: Fairfax, VA | September, 2023
Date: 2023-09-27
Adaxial side
Location: Nationale Plantentuin Meise (Brussels)
Date: 2018-10-10
Location: Nationale Plantentuin Meise (Brussels)
Date: 2019-01-23
Location: Nationale Plantentuin Meise (Brussels)
Date: 2019-01-23
Location: Frank Farley Service Plaza grounds in southern New Jersey
Date: 2023-09-27
good full-grown specimen
Location: Cheslen Land Preserve in southeast Pennsylvania
Date: 2018-10-03
looking up the trunk

Date: c. 1865
illustration [as Q. obtusiloba] by P. J. Redouté from Michaux's
Location: Fairfax, VA | May, 2023
Location: Nationale Plantentuin Meise (Brussels)
Date: 2018-10-10
Location: Nationale Plantentuin Meise (Brussels)
Date: 2018-10-10
Photo by wildflowers
Location: Cheslen Land Preserve in southeast Pennsylvania
Date: 2018-10-03
a group in the serpentine barren soil
Location: I 45 rest area, Texas
Date: 2014-05-21
Location: near Malvern, Pennsylvania
Date: 2015-09-11
mature tree in a serpentine barrens
Location: Thorndale, Pennsylvania
Date: 2018-11-03
getting yellow fall colour, not quite full
Location: Cheslen Land Preserve in southeast Pennsylvania
Date: 2018-10-03
two acorns on end twig
Location: Fairfax, VA | May, 2023
Leaf on the left.
Photo by wildflowers
Location: Thorndale, Pennsylvania
Date: 2010-08-28
a maturing tree near parking lots
Location: Thorndale, Pennsylvania
Date: 2008-08-01
the unique leaf
Photo by wildflowers

Photo courtesy of: Tom Potterfield
Location: Plano, TX
Date: 2013-10-02
Location: Wise Co, TX
Date: 2013-10-02
Growing wild in Wise Co. TX
Location: Wise Co, TX
Date: 2013-10-01
Location: Wise Co, TX
Date: 2013-10-01
Mature trees
Location: Wise Co, TX
Date: 2013-10-01
Location: Wise Co, TX
Date: 2013-10-01
Location: Rest stop near Leona, Tx. (I-45)
Date: 2014-05-19
Location: Rest stop near Leona, Tx. (I-45)
Date: 2014-05-19
Location: Rest stop near Leona, Tx. (I-45)
Date: 2014-05-19
Location: Nottingham Park in southeast PA
Date: 2010-09-03
full-grown tree in summer
Location: Nottingham Park in southeast PA
Date: 2010-09-03
large old trunk
Location: Thorndale, Pennsylvania
Date: 2010-08-28
mature trunk with bark

USDA photo
Comments:
  • Posted by ILPARW (southeast Pennsylvania - Zone 6b) on Dec 10, 2017 8:00 PM concerning plant:
    Post Oak is a handsome large tree that is native to almost all of the South, plus eastern Kansas, all Missouri, southern Illinois & Indiana & Ohio, and New Jersey and southeast Pennsylvania. It has unique-shaped, glossy, thick, leathery leaves that turn golden brown in autumn. It grows on upland sites, slopes. hills, and mountains. It grows about 3/4 foot/year and lives 300 to 400 years. It develops a taproot, so it is hard to transplant. It is offered by a few native plant nurseries.
  • Posted by jmorth (central Illinois) on May 31, 2014 9:35 AM concerning plant:
    So named for it's extensive use as posts in fencing projects. Another big use is as a fuel in Texas BBQ.
    Tree has a fairly extensive range from south central Illinois and very south Iowa down to central Texas and east from Connecticut to Florida.
    Leaf has been described as in the shape (roughly) of a Maltese cross.

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