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Regal Prince Oak is an ideal selection for use as a shade tree in small yards. It grows to a mature height of 40-50 feet with a spread of 18 feet. It features bright green foliage in spring, dark green in summer, golden yellow in fall, and shows off an attractive bark and silhouette during winter.

Tree of the Month: Regal Prince Oak

By Len Phillips, ASLA Emeritus


Trade Name: Regal Prince Oak

Botanical Name: Quercus robur x bicolor ‘Long’

Family: Fagaceae

Parentage: Quercus robur x bicolor

Year of Introduction: Earl Cully introduction, 2000

Height: 40 to 50 feet

Spread: 18 feet

Form: Columnar, narrow, upright

Flower: Catkin

Fruit: Acorn

Foliage: Glossy, clean, silvery underside

Spring Color: Bright green

Summer Foliage: Dark green

Autumn Foliage: Golden yellow


Photos provided by J. Frank Schmidt & Son Co.Winter Color: Attractive bark and silhouette

Bark: Dark, deeply furrowed

Habitat: Upper Midwest

Culture: Adapts to wide range of soil types, wet and dry tolerant

Site Requirements: Full sun

Hardiness Zone*: 4 to 8 noted for Upper Midwest hardiness

Growth Rate: Slow grower, very long-lived tree

Pest Resistance: Noted for mildew and borer resistance

Storm Resistance: Good

Salt Resistance: Excellent

Planting: Transplant bare root, B&B, or container

Pruning: Prune at planting and 3 years later to mature form

Propagating: Cuttings grafted onto seedling understock

Design Uses: Excellent for street tree and trees in small yards

Other Comments: Ideal selection for shade tree in small yards, suitable for CU-Structural Soil planting

Available From: Select nurseries, may require some searching


* For information about the USDA Hardiness Zone Map, visit www.usna.usda.gov/Hardzone/index.html


These are the personal observations of the author, living in New England – Zone 5b. Len Phillips can be reached via e-mail at lenphillips@on-line-seminars.com

Photos provided by J. Frank Schmidt & Son Co.

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