Carya illinoinensis
Overview
The Pecan is a large deciduous hardwood tree best known for producing one of North America’s most important native nuts. Native to the central and southern United States, it is valued for its nutritious nuts, towering size, attractive foliage, and economic importance. Mature pecans can live for centuries and develop expansive canopies that provide shade and wildlife habitat.
Although commonly associated with orchards and the southern United States, Pecan is also planted in parks, campuses, and arboretum collections where visitors can learn about one of America’s most significant native nut-producing trees.
Identification
Leaves
- Alternate leaf arrangement
- Pinnately compound leaves
- Typically 9 to 17 leaflets per leaf
- Dark green during the growing season
- Yellow fall color
- Leaflets are narrow and finely serrated
Bark
- Gray to gray-brown bark
- Develops long ridges and furrows with age
- Mature bark has a rugged appearance
Flowers
- Male flowers produced as drooping catkins
- Female flowers occur in small clusters near branch tips
- Wind-pollinated
- Bloom in spring
Fruit
- Oblong nuts enclosed within a green husk
- Husks split open when mature
- Nuts ripen in autumn
- Kernels are sweet, oily, and edible
Size
- Typically grows 70 to 100 feet tall
- May exceed 130 feet under favorable conditions
- Mature spread of 40 to 75 feet
Native Range
Pecan is native to the central and southern United States, particularly along river valleys and floodplains from Illinois and Iowa south to Texas and Mexico. It thrives in deep, fertile soils with consistent moisture.
Within the Marshall University Arboretum, Pecan is classified as a United States Native species.
Ecology and Wildlife Value
Pecan provides valuable food and habitat for wildlife.
Its nuts are consumed by:
- Squirrels
- Chipmunks
- White-tailed deer
- Wild turkeys
- Blue jays
- Other birds and mammals
Large pecan trees also provide:
- Nesting habitat
- Shade and shelter
- Roosting sites for birds
- Support for numerous native insects
Because of their size and longevity, mature pecans can serve as important components of urban and natural ecosystems.
Human Uses and Cultural Significance
Pecan is among the most commercially important native nut trees in North America.
The species is cultivated for:
- Fresh nuts
- Baking
- Candies and desserts
- Cooking oils
- Specialty food products
Pecans have been an important food source for Indigenous peoples for centuries and continue to play a major role in American agriculture today.
The wood is also valued for:
- Furniture
- Flooring
- Cabinetry
- Specialty woodworking
- Smoking meats
Pecan at Marshall University
Pecan contributes shade, wildlife value, and educational interest to the Marshall University Arboretum. Its large compound leaves, distinctive nuts, and impressive mature size provide visitors with an opportunity to observe one of North America’s most important native nut-producing trees.
As a United States-native species, Pecan helps illustrate the botanical diversity of American forests while connecting visitors to a tree with significant ecological, cultural, and agricultural importance.
Quick Facts
Common Name: Pecan
Scientific Name: Carya illinoinensis
Family: Juglandaceae
Native Region: United States Native
Mature Height: 70-100 feet (occasionally 130+ feet)
Mature Spread: 40-75 feet
Growth Rate: Moderate to Fast
Sun Requirements: Full Sun
Soil Preferences: Deep, moist, well-drained soils
USDA Hardiness Zones: 5-9
Bloom Period: April to May
Fruit/Seed: Edible nuts enclosed in green husks that split open at maturity
Wildlife Value: Important food source for birds and mammals; provides nesting and shelter habitat
Notable Characteristics: Edible nuts, large compound leaves, impressive size, and economic importance