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The Old Wolf Oak Tree

Ponca State Park tree is one of the oldest in Nebraska

Nebraska Game and Parks Commission properties include some very beautiful and interesting habitats and ecological systems. Each region of the state contains a variety of wetlands, grasslands and woodlands. Consequently, unique plant specimens may be found at our parks and wildlife management areas. .

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Ponca’s 373 Year Old Tree

Ponca State Park, one the agency’s flagship parks, is located on bluffs overlooking the Missouri River just 2 miles north of the town of Ponca. Growing in the interior of park woodlands is a bur oak (Quercus macrocarpa) estimated at a whopping 373 years old. This “Old Wolf Tree” was so named and designated as a “Nebraska Heritage Tree” by the Nebraska Community Forestry Council and the Nebraska Forest Service in 2006.

PONCA STATE PARK:
PONCA STATE PARK: Fog lingers along the Missouri River.

Wolf Trees

Foresters often name/identify old, large and solitary trees of any species that occupy considerable space in their neck of the woods as “wolf trees,” so named because they are wolfing up space. These old specimens somehow gained a foothold – through superior genetics, a slightly better niche of site conditions or escape by fire or animal browsing – to overtop and outcompete adjacent trees. And with this advantage in growth, a wolf tree can even shade out any seedlings that emerge beneath. Once a tree gains elder status, it will reign supreme over its section of woodlands until it grows old and dies.

The Ponca Wolf Oak was core sampled in 1964, we believe by staff of the now Nebraska Forest Service, and estimated at 320 years.

Ponca Tree
Sign reads: This oak tree began its life in 1644 and was 143 years old when the U.S. Constitution was signed on Sept. 17, 1787. The tree was 223 years old when Nebraska became a state in 1867.

Aging a Tree

To age a tree, foresters use an increment borer to drill and extract a soda straw-sized core of wood from the tree stem. If the drill can reach the pith center of the tree from the perimeter of the trunk, a sample containing each annual growth ring may be extracted. After adding about five years to the count of rings, to account for seedling emergence and development, a reasonably accurate estimate of the age may be derived.

…this tree is undoubtedly one of the oldest in Nebraska.

Our current age estimate is determined by adding 53 years to the original estimate in 1964. Colleagues of mine agree that this tree is undoubtedly one of the oldest in Nebraska. As a timeline perspective, this tree may have emerged as a seedling on the year that William Penn, who founded the Pennsylvania Colony, was born.

State Champion Trees

Currently the Ponca Wolf Oak is 9.8 feet in circumference. Interestingly, the Nebraska Champion Tree Registry, maintained by the Nebraska Forest Service, lists the State Champion (largest) bur oak at 18.7 feet in circumference, which grows somewhere in Peru County. But to my knowledge the State Champion bur oak has never been core dated.

The Ponca Wolf Oak exhibits very smooth bark when compared to typical bur oaks, indicating very slow growth at least in recent years. Slow growth translates to very narrow annual growth rings. So likely the Ponca tree could be much older than the State Champion bur oak, which is twice the circumference.

Park Woodlands have Changed

The park woodlands looked much different during pre-settlement in 1644. Historically, fire was the major ecological force in the Missouri River bluff ecosystem forming a mosaic of plant communities. Dense forests of basswood, red oak, black oak and hickories grew in somewhat fire-protected bottoms and on low north-and east-facing slopes. Higher on these slopes were woodlands dominated by the more drought- and fire-tolerant bur oak.

And in southeastern Nebraska chinkapin oak (Quercus muehlenbergii) also grow on these drier sites. These dry west- and south-facing slopes and ridge tops supported tallgrass prairie and an oak savannah (prairie with scattered oaks); fire discouraged the encroachment of trees in prairie sites and limited the densities of woodlands in savannah environments. Consequently, the Ponca Wolf Oak probably originally sprouted and developed with only a few other trees on its home acre.

Settlement gradually developed following the Lewis and Clark Expedition in 1804; and, fearful of fire, settlers began extinguishing any fires started by lightning or other sources of ignition. The gradual absence of fire has allowed the establishment of many other mid-canopy and understory species, creating a dense forest canopy often limiting the development of oak regeneration.

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Ponca Wolf Oak’s Future

Despite increased competition over three centuries, the Ponca Wolf Oak has prevailed and appears healthy. During a recent visit the foliage looked normal, with little apparent damage of fungal blight and insect damage, and only a small percentage of the crown exhibits dieback of branches.

I also noticed bulbous callus growth covering most of the limbs that had been removed or died and fallen from the crown; a good sign of tree vigor. It’s anyone’s guess how long the tree will survive, but for the short term its future looks promising.

Tree Huggers

Tree huggers like me can be odd nuts, and we often become emotionally attached to special trees, sometimes assigning a living soul to ancient woodland specimens; and as far out as it seems, we just can’t help but wonder what they have witnessed during their lifetime. How cool it would be if they could share a video story of the change in their landscape, a witness of people and creatures who passed by. ■

By: Mike Groenewold

Mike has been a park horticulturist at the Nebraska Game and Parks Commission since 1977.
See More: The ‘Old Wolf Oak’ at Ponca has captured the attention of countless visitors over the years. Check out the work of the following two “tree huggers” inspired by this amazing tree:

tree journal entrysculpture

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Published by the Nebraska Game and Parks Commission since 1926, NEBRASKAland Magazine is dedicated to an engaging mix of outstanding photography and informative writing, highlighting Nebraska’s outdoor activities, parks, wildlife, history and people.

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