TREE OF THE MONTH 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 under- side
Spring Color: Bright green Summer Foliage: Dark green Autumn Foliage: Golden yellow 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. 26 Arbor Age / November/December 2012 www.arborage.com
