- Bradford pear is a cultivar of Pyrus calleryana. It is a deciduous tree that can grow up to 60 ft. (18 m) in height and 2 ft. (0.6 m) in diameter.
- The leaves are alternate, simple, 2-3 in. (5.1-7.6 cm) long, petiolate, and shiny with wavy, slightly toothed margins.
- Flowering occurs early in the spring (April to May) before the leaves emerge. The flowers are 1 in. (2.5 cm) wide, showy, malodorous, and white. It is insect pollinated.
- Fruits are round, 0.5 in. (1.3 cm) in diameter and green to brown in color.
- Ecological Threat
- Pyrus calleryana 'Bradford', produce sterile fruits because they do not self-pollinate. They have been widely planted throughout the United States since the early 1900s as an ornamental. New cultivars of Pyrus calleryana were bred to reduce the tree's tendency to split in snow or high winds. The Bradford pear cultivar, other P. calleryana cultivars and P. betulifolia or Asian pear, can hybridize and produce fertile fruit. In addition to this, fertile pear varieties are commonly used as the rootstock when grafting. If the grafted crown is damaged the fertile rootstock can them dominate, producing fertile fruit. These factors and others may have contributed to the trees seeding out into natural areas and becoming an invasive problem.
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EDDMapS Distribution - This map is incomplete and is based only on current site and county level reports made by experts, herbaria, and literature. For more information, visit www.eddmaps.org
State Invasive List - This map identifies those states that list this species on their invasive species list. For more information, visit Invasive.org
Invasive Listing Sources
- Alabama Invasive Plant Council
- Commonwealth of Pennsylvania, Department of Conservation and Natural Resources, 1994.
- Eric Ulaszek, U.S. Forest Service, Midewin National Tallgrass Prairie, Illinois
- Georgia Exotic Pest Plant Council - Category 3
- Great Lakes Early Detection Network
- Illinois Invasive Plant List
- Maryland Cooperative Extension Service. 2003. Invasive Plant Control in Maryland. Home and Garden Information Center, Home and Garden Mimeo HG88. 4 pp.
- Mid-Atlantic Exotic Pest Plant Council, 2005
- Native Plant Society of Oregon, 2008
- Nonnative Invasive Species in Southern Forest and Grassland Ecosystems
- South Carolina Exotic Pest Plant Council - Watch A
- Tennessee Exotic Pest Plant Council
- Virginia Invasive Plant Species List
- WeedUS - Database of Plants Invading Natural Areas in the United States
CategoriesCategory: Hardwood Trees
|Common Name Reference:|| USDA, NRCS. 2010. The PLANTS Database. National Plant Data Center, Baton Rouge, LA, USA.|
|Scientific Name Reference:||USDA, NRCS. 2010. The PLANTS Database. National Plant Data Center, Baton Rouge, LA, USA.|