Quercus x bicolor Long – Regal Prince® Oak

Botanical Name: Quercus x bicolor Long

Alternate Name: Regal Prince® Columnar Oak, Quercus x warei ‘Long’, Quercus robur x bicolor ‘Long’

The Regal Prince® Oak is an attractive, long-lived, medium sized deciduous tree. It is a cross between the Swamp White Oak (Quercus bicolor) and the Columnar English Oak (Quercus robur ‘Fastigiata’). ‘Long’ refers to the tall, symmetrical, thin, oval or columnar shaped canopy with upright growing branches. It grows to a height of 40-60 feet tall with a spread of 20-25 feet.

The flowers of the Regal Prince® Oak are catkins. They emerge in the spring, along with the leaves, as greenish-yellow separate male and female flowers. The fruits are oval shaped acorns that grow up to 1 inch in length and are borne on long stalks.

The leaves are dark green, leathery with pale green undersides similar to the Swamp White Oak. They are obovate (wider toward the tip than the base), with 6 to 8 pairs of lobes. In the fall, the leaves turn radiant shades of red, orange, yellow, and brown.

Regal Prince® Oak is a tough tree with a high resistance to powdery mildew and excellent cold hardiness and wind resistance. It tolerates a variety of pH and soil conditions, as well as urban pollution, but should not be allowed to dry out.


Height: 40-60 ft.
Width: 20-25 ft.
Shape: Oval, Columnar and Low Branching
Flower Color: Yellowish-Green
Flowering Time: April
Fall Color: Yellow, Purple, Red
Features: Attractive narrow form
Exposure: Full Sun
Watering: Moderate & Regular, should not be allowed to dry out
Soil: Prefers slightly acidic, moist, well-drained loam, but tolerates a variety of soil conditions.
Growth Rate: Slow-Moderate
USDA Zones: 4-9
Uses: Lawn tree, shade tree, park tree, street tree, vertical accent, group plantings
Similar Trees: Bur Oak (Quercus macrocarpa), Pin Oak (Quercus palustris), Willow Oak (Quercus phellos), Shumard Oak (Quercus shumardii), Swamp White Oak (Quercus bicolor), Scarlet Letter™ Oak (Quercus robur x alba ‘Scarlet Letter’)

Additional information


Columnar, Oval, Low Branching

Flower Color

Green, Yellow

Flowering Time


Fall Color

Purple, Red, Yellow

Growth Rate

Moderate, Slow


Group Plantings, Lawn Tree, Park Tree, Shade Tree, Street Tree, Vertical Accent

USDA Zones

4, 5, 6, 7, 8, 9

Mature Height

40'-50', 50'+

Mature Width



Full Sun

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