Quercus macrocarpa (Bur Oak)

Also known as Burr Oak, Savanna Oak, Overcup Oak, Prairie Oak.

Bur Oak is a large, stately deciduous tree with a wide, open crown. The acorns are the largest of all native oaks.

Bur Oak is moderately fast growing. Once established, it can grow 12-20 inches a year. Best growth occurs in deeper soils. Bur Oak’s strong wood makes its branches resistant to wind and ice damage. Its corky bark protects it from sunscald. Bur Oak develops large taproot and is drought-tolerant once established.  It is also oak wilt resistant but like many oaks, it can be sensitive to root zone disturbance caused by construction.

Bur Oak has a tendency to develop some horizontal lower branches that can make them good candidates for swings. Bear in mind that bur oaks are large trees, with canopy that can exceed 60 feet as they mature, so please plant with mature size in mind to prevent future conflicts with power lines and buildings. 

Bur Oaks are used by wide range of wildlife, including mammals, songbirds, ground birds and insect eating birds. Acorns are also eaten by wildlife.

Planting Instructions: Dig a hole two times wider than the tree container, but the same depth as the root ball. If the tree is buried too deep in the container, remove excess soil to uncover root collar. Sides of the hole should be irregular, not smooth. Loosen exterior roots gently. If the plant is root-bound, the outer roots may be cut in several places. Place the tree in the hole so that the root collar sits a bit above the ground level since the soil will settle some. Backfill the hole using soil that was dug out. Avoid adding non-native soil if possible. Do not add any soil to the top of the root ball. Pack the loose soil in the hole with your hands to avoid creating air pockets. Add mulch making sure it is at least 3-5 inches away from the tree trunk. Water deeply.

AT A GLANCE

DISTRIBUTION MAPS 

USDA MAP

BONAP MAP

Present in state

Present in county and native

Native to North America, but adventive & escaped in state

Not present in state

Present and rare, native in county

Previously present, now extinct

Questionable presence (cross-hatched, regardless of color)